CN203180026U - Cavity filter and communication radio frequency device - Google Patents
Cavity filter and communication radio frequency device Download PDFInfo
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- CN203180026U CN203180026U CN 201320039793 CN201320039793U CN203180026U CN 203180026 U CN203180026 U CN 203180026U CN 201320039793 CN201320039793 CN 201320039793 CN 201320039793 U CN201320039793 U CN 201320039793U CN 203180026 U CN203180026 U CN 203180026U
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Abstract
The utility model discloses a cavity filter and a communication radio frequency device, wherein the cavity filter comprises at least three coaxially arranged metal resonators, any two of a first metal resonator, a second metal resonator and a third metal resonator are respectively coupled through a coupling window, the first metal resonator is connected to a filter port through a tap, at least one coupling slot is arranged on a dividing wall between the first metal resonator and the third metal resonator, a coupling body is arranged inside the coupling slot through a passing-through manner, one end of the coupling body is connected to the tap, and the other end of the coupling body extends into a third resonant cavity on which the third metal resonator is positioned. According to the utility model, under the condition that the resonator is not additionally arranged, one transmission zero point can be added at a frequency band which is greater than the passband frequency of the filter so as to increase the inhibition effect of the filter on noise wave.
Description
[technical field]
The utility model relates to the communications field, relates in particular to a kind of cavity body filter and communication radio frequency device.
[background technology]
Cavity body filter is widely used in the communications field as a kind of frequency selection device, especially field of radio frequency communication.In the filter design, in order to make the filter loss minimum, structure realizes cost optimization, need reduce the use amount of resonator as far as possible, but when resonator uses sum to reduce, filter is to the outer clutter inhibition degree meeting variation of passband, in order to accomplish both to reduce the resonator use amount, and don't damage filter to the inhibition ability of clutter, then need in the filter construction design process, to need to add the cross-couplings transmission zero, to realize filter the height of clutter is controlled consumption, but in the filter design process, filter is limited by topological structure often again, can only realize limited transmission zero, the number that how to increase the filter transmission zero is a difficult problem of filter design.
As shown in Figure 1, in existing filter construction design, in order to increase the transmission zero of filter to greatest extent, the overall dimension of compression filter, reduce the production cost of filter, often make the arrangement between the resonator be isosceles or equilateral triangle shape, first resonator 510 as shown in Figure 1, second resonator 520, the 3rd resonator 530, first resonator 510 is by coupling window and 520 couplings of second resonator, second resonator 520 is by coupling window and 530 couplings of the 3rd resonator, wherein first resonator 510 is connected with input port, the 3rd resonator 530 is connected with output port, practice filters generally includes the resonator more than 3, namely after the 3rd resonator 530, also has the 4th resonator, the 5th resonator ... the N resonator, wherein the N resonator is connected with output port again.For realizing a transmission zero at high side of filter passband (frequency band that namely is higher than band connection frequency), the most succinct way is to open an energy coupling window 540 between first resonator 510 and the 3rd resonator 530, make first resonator 510 form the energy coupling identical with the main channel phase place with the 3rd resonator 530, in Fig. 1, have two resonators that are connected with tap and be respectively first resonator and the 3rd resonator.The circuit equivalent structure of filter shown in Figure 1 as shown in Figure 2, between first resonator and the 3rd resonator, load the impedance transformer TL18 that a phase place is+90 degree, realize a transmission zero in that passband is high-end in the filter response waveform, namely a side that is higher than filter passband in frequency realizes a transmission zero.The waveform of circuit is as shown in Figure 3 corresponding among Fig. 2, in Fig. 3, and filter response passband upper sideband S(2,1) waveform sink at the 2661MHz place, form high attenuation coefficient, make the signal of communication of 2661MHz can't pass through filter, to realize that filter is to the high filtration of 2661MHz signal.And in actual applications, filter often needs the signal of broadband passband is more filtered, such as increasing a transmission zero again at 2680MHz or 2610MHZ annex, to realize the high-end more superior signal attenuation filtration of passband.Yet in the traditional design mode as Fig. 1, three resonators generally can only be realized a transmission zero, be difficult to increase again the cross-couplings transmission zero, this just makes Filter Design be subjected to certain restriction, under the prerequisite that does not increase resonator, filter also just is difficult to further lifting to the inhibition ability of interference signal.
[utility model content]
The utility model provides a kind of coupled structure and cavity body filter of coaxial metal resonator, it can increase a transmission zero by the high-end or low side in the filter passband frequency again under the situation that does not increase resonator, to increase filter to the inhibitory action of clutter.
The utility model provides a kind of cavity body filter, the metal resonators that comprises at least three coaxial settings, first metal resonators wherein, any two in second metal resonators and the 3rd metal resonators are coupled by coupling window respectively, described first metal resonators is connected by tap with the filter port, on the dividing wall between described first metal resonators and described the 3rd metal resonators, also offer at least one coupling slot, be equipped with coupling body in the described coupling slot, coupling body one end is connected with described tap, and the other end extends in the 3rd resonant cavity at described the 3rd metal resonators place.
According to cavity body filter of the present utility model, the length of described coupling body is less than filter center frequency quarter-wave, and the end that described coupling body extends in the 3rd resonant cavity is connected with described the 3rd resonant cavity or is connected with described the 3rd metal resonators, to form transmission zero at described high side of filter passband.
According to cavity body filter of the present utility model, described coupling body extend into that a end in the 3rd resonant cavity is connected with cavity bottom, the chamber wall of described the 3rd resonant cavity or, described coupling body extends into the position connection of corresponding described the 3rd resonant cavity on the interior end of the 3rd resonant cavity and the filter cover board.
According to cavity body filter of the present utility model, the length of described coupling body is greater than filter center frequency quarter-wave, the end that described coupling body extends into the 3rd resonant cavity is suspended in described the 3rd resonant cavity, to form transmission zero at described high side of filter passband.
According to cavity body filter of the present utility model, the length of described coupling body is greater than filter center frequency quarter-wave, and the end that described coupling body extends in the 3rd resonant cavity is connected with described the 3rd resonant cavity or is connected with described the 3rd metal resonators, to form transmission zero at described filter passband low side.
According to cavity body filter of the present utility model, described coupling body extend into that a end in the 3rd resonant cavity is connected with cavity bottom, the chamber wall of described the 3rd resonant cavity or, described coupling body extends into the position connection of corresponding described the 3rd resonant cavity on the interior end of the 3rd resonant cavity and the filter cover board.
According to cavity body filter of the present utility model, the length of described coupling body is less than filter center frequency quarter-wave, the end that described coupling body extends into the 3rd resonant cavity is suspended in described the 3rd resonant cavity, to form transmission zero at described filter passband low side.
According to cavity body filter of the present utility model, described coupling body is sheet metal, Metallic rod or surface metal conductor.
According to cavity body filter of the present utility model, described first metal resonators, second metal resonators and described the 3rd metal resonators are isosceles or triangular arranged.
The utility model correspondence provides a kind of communication radio frequency device, described communication radio frequency device comprises above-mentioned cavity body filter, described cavity body filter is located at the transceiver circuit part of described communication radio frequency device, be used for signal is selected, described communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
The utility model also provides another kind of cavity body filter, the metal resonators that comprises at least three coaxial settings, wherein first metal resonators and second metal resonators are coupled by coupling window, described second metal resonators and the 3rd metal resonators are coupled by coupling window, described first metal resonators is connected by tap with the filter port, on the dividing wall between described first metal resonators and described the 3rd metal resonators, also offer at least one coupling slot, be equipped with coupling body in the described coupling slot, coupling body one end is connected with described tap, and the other end extends in the 3rd resonant cavity at described the 3rd metal resonators place.
The utility model correspondence provides another kind of communication radio frequency device, described communication radio frequency device comprises above-mentioned another kind of cavity body filter, described cavity body filter is located at the transceiver circuit part of described communication radio frequency device, be used for signal is selected, described communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
Because filter of the present utility model is provided with a coupling window and a coupling slot between first metal resonators and the 3rd metal resonators.Wherein, first coupling window and coupling window structure of the prior art and position, effect are identical, are used for forming transmission zero; Be equipped with coupling body in the coupling slot, coupling body one end is connected with tap, the other end extends in the 3rd resonant cavity at the 3rd metal resonators place, the energy of electromagnetic field of first metal resonators thereby the feasible filter port that is connected with tap not only can be coupled, the energy of electromagnetic field of the 3rd metal resonators that also can be coupled simultaneously, be equivalent between filter port and the 3rd metal resonators, reload a phase place and be the impedance variation device of+90 degree or phase place-90 degree, through circuit synthesis and electromagnetic-field simulation demonstration, sort circuit and structural change can make the frequency response of filter change, under the prerequisite that does not change the filter passband response, can produce many transmission zeros at the low side of the high-end of filter passband frequency or filter passband frequency, thereby greatly improved the high-end inhibition strength to clutter of passband, realized when not increasing resonator, making filter that the high-end clutter of passband is suppressed even more ideal.
[description of drawings]
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.In addition, accompanying drawing is not proportionally drawn.Wherein
Fig. 1 is the schematic perspective view of existing cavity body filter coupled structure;
Fig. 2 is the equivalent circuit structure figure of cavity body filter among Fig. 1;
Fig. 3 is the frequency response chart of cavity body filter among Fig. 1;
Fig. 4 is the perspective view at a kind of visual angle of the utility model embodiment one cavity body filter;
Fig. 5 is the perspective view at another visual angle of the utility model embodiment one cavity body filter;
Fig. 6 is the vertical view of the utility model embodiment one cavity body filter;
Fig. 7 is the equivalent circuit structure figure of the utility model embodiment one cavity body filter;
Fig. 8 is the frequency response chart of the utility model embodiment one cavity body filter;
Fig. 9 is the perspective view at a kind of visual angle of the utility model embodiment two cavity body filters;
Figure 10 is the perspective view at a kind of visual angle of the utility model embodiment three cavity body filters;
Figure 11 is the frequency response chart of the utility model embodiment three cavity body filters;
Figure 12 is the perspective view at a kind of visual angle of the utility model embodiment four cavity body filters.
[embodiment]
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one
As Fig. 4～shown in Figure 6, the utility model embodiment provides a kind of cavity body filter 100, this cavity body filter 100 is used for the communication radio frequency device, cavity body filter 100 is located at the transceiver circuit part of communication radio frequency device, be used for signal is selected, the communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
On the dividing wall between first metal resonators 110 and the 3rd metal resonators 130, also offer coupling slot 150, be equipped with coupling body 151 in the coupling slot 150, the coupling window 140 between this coupling slot 150 and first metal resonators 110 and the 3rd metal resonators 130 is separated.Coupling body 151 1 ends are connected with first tap 112, and the other end extends in the 3rd resonant cavity 133 at the 3rd metal resonators 130 places.Preferably, coupling body 151 is preferably sheet metal, Metallic rod or surface metal conductor.Simultaneously, the length of coupling body 151 is greater than filter center frequency quarter-wave, and the end that coupling body 151 extends into the 3rd resonant cavity 133 is suspended in the 3rd resonant cavity 133, to form transmission zero at high side of filter passband.The end that coupling body 151 extends into the 3rd resonant cavity 133 is suspended in the 3rd resonant cavity 133, is except coupling body 151 1 ends to be connected with first tap 112, and other positions of coupling body 151 all do not contact with any position of cavity body filter 100.
The principle explanation of present embodiment:
The cavity body filter of present embodiment can equivalence be circuit structure shown in Figure 7.In Fig. 7, Term2 is the first filter port one 11, Term1 is the second filter port one 31, the PRLC3 equivalence is first metal resonators 110, PRLC2 is equivalent to second metal resonators 120, PRLC3 is equivalent to the 3rd metal resonators 130, and wherein impedance transformer TL18 is equivalent to coupling window 140, and impedance transformer TL19 is equivalent to coupling slot 150 and coupling body 151.Comparison diagram 2 and Fig. 7 as can be known, with respect to prior art, cavity body filter of the present utility model has been equivalent to increase a phase place and has been the impedance transformer TL19 of+90 degree between the first filter port one 11 and the 3rd metal resonators 130.
The frequency response waveform of the cavity body filter of present embodiment as shown in Figure 8.In Fig. 8, filter response passband upper sideband S(2,1) sink at 2661MHz and 2675MHz place waveform, form high attenuation coefficient, make 2661MHz and 2675MHz signal of communication can't pass through filter, to realize filter to the high filtration of 2661MHz and 2675MHz signal, two transmission zeros that go out at 2661MHz and 2675MHz have been realized.And in prior art as shown in Figure 2, filter only forms transmission zero at the 2661MHz place.Present embodiment is with respect to prior art, under the prerequisite that does not change the filter passband response, can produce many transmission zeros at high side of filter passband, namely produce many transmission zeros in the side greater than the filter passband frequency, thereby greatly improved the high-end inhibition strength to clutter of passband, realized when not increasing resonator, making filter that the high-end clutter of passband is suppressed even more ideal.
In addition, the length that coupling body 151 extends into the 3rd resonant cavity 133 is decided by the coupling energy of filter demand, needs the more strong then coupling body 151 of magnetic field energy of coupling to need the closer to the 3rd metal resonators 130, otherwise otherwise.And present embodiment is applied to the length overall of coupling body 151 greater than under the quarter-wave situation of filter center frequency, just coupling body 151 1 ends is connected with first tap 112, and the other end is suspended in the 3rd resonant cavity 133.Concrete, because the length overall of coupling body 151 is greater than under the quarter-wave situation of filter center frequency, the energy of coupling is reversed-90 degree easily, the energy of coupling and undesirable magnetic field energy, therefore that end that extends into the 3rd resonant cavity 133 need be opened a way and is suspended in the 3rd resonant cavity 133 inside, be coupling body 151 except an end with the first filter port one 11 is connected, all the other positions all need suspend and can not be connected short circuit with cavity.
Preferably, also another coupling body can be set in the coupling window 140 between first metal resonators 110 and the 3rd metal resonators 130, this another coupling body is connected with the cavity of first metal resonators, 130 places, first resonant cavity and the cavity of the 3rd resonant cavity 133 respectively, this another coupling body can strengthen the coupling between first metal resonators 110 and the 3rd metal resonators 130, thereby the feasible transmission zero that is realized by the coupling window 140 between first metal resonators 110 and the 3rd metal resonators 130 is approached filter passband more.
In addition, the dividing wall between first metal resonators 110 and the 3rd metal resonators 130 begins a plurality of coupling slots 150 and a plurality of coupling bodies 151 is set, thereby realizes a plurality of transmission zeros; But in actual production and design, because structural limitations and the technological requirement of cavity body filter 100 only can be offered a coupling slot 150 and a coupling body 151 is set by the dividing wall between first metal resonators 110 and the 3rd metal resonators 130 usually.
Embodiment two
As shown in Figure 9, the utility model embodiment provides a kind of cavity body filter 200, this cavity body filter 200 is used for the communication radio frequency device, cavity body filter 200 is located at the transceiver circuit part of communication radio frequency device, be used for signal is selected, the communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
On the dividing wall between first metal resonators 210 and the 3rd metal resonators 230, also offer coupling slot 250, be equipped with coupling body 251 in the coupling slot 250, the coupling window 240 between this coupling slot 250 and first metal resonators 210 and the 3rd metal resonators 230 is separated.Coupling body 251 1 ends are connected with first tap 212, and the other end extends in the 3rd resonant cavity 233 at the 3rd metal resonators 230 places.Preferably, coupling body 251 is preferably sheet metal, Metallic rod or surface metal conductor.
Different with embodiment one is, in the present embodiment, the length of coupling body 251 is less than filter center frequency quarter-wave, and the end that coupling body 251 extends in the 3rd resonant cavity 233 is connected with the 3rd resonant cavity 233 or is connected with the 3rd metal resonators 230.Concrete, in Fig. 9, the end that coupling body 251 extends in the 3rd resonant cavity 233 is connected with the cavity bottom of the 3rd resonant cavity 233, obviously, the end that coupling body 251 extends in the 3rd resonant cavity 233 also can be connected with the chamber wall of the 3rd resonant cavity 233, perhaps coupling body 251 extends into the position connection of corresponding the 3rd resonant cavity 233 on a end and the filter cover board in the 3rd resonant cavity 233, and perhaps coupling body 251 extends into the 3rd resonant cavity 233 interior ends and directly is connected with the 3rd metal resonators 30.
The principle explanation of present embodiment:
The cavity body filter of present embodiment can equivalence be circuit structure shown in Figure 7 also.Circuit structure among Fig. 7 elaborates in embodiment one, so do not repeat them here.In the present embodiment, though the end that coupling body 251 extends in the 3rd resonant cavity 233 is connected with the 3rd resonant cavity 233 or is connected with the 3rd metal resonators 230, but because the length of coupling body 251 is less than filter center frequency quarter-wave, so the energy of coupling body 151 couplings be+90 to spend.Therefore, the frequency response waveform of the cavity body filter 200 of the present embodiment also frequency response waveform of the cavity body filter 100 among the embodiment one is identical, all be to produce many transmission zeros at high side of filter passband, detailed description can referring among the embodiment one to the elaboration of Fig. 8.
Thereby present embodiment is with respect to prior art, under the prerequisite that does not change the filter passband response, can produce many transmission zeros at high side of filter passband, namely produce many transmission zeros in the side greater than the filter passband frequency, thereby greatly improved the high-end inhibition strength to clutter of passband, realized when not increasing resonator, making filter that the high-end clutter of passband is suppressed even more ideal.
Embodiment three
As shown in figure 10, the utility model embodiment provides a kind of cavity body filter 300, this cavity body filter 300 is used for the communication radio frequency device, cavity body filter 100 is located at the transceiver circuit part of communication radio frequency device, be used for signal is selected, the communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
On the dividing wall between first metal resonators 310 and the 3rd metal resonators 330, also offer coupling slot 350, be equipped with coupling body 351 in the coupling slot 350, the coupling window 340 between this coupling slot 350 and first metal resonators 310 and the 3rd metal resonators 330 is separated.Coupling body 351 1 ends are connected with first tap 312, and the other end extends in the 3rd resonant cavity 333 at the 3rd metal resonators 330 places.Preferably, coupling body 351 is preferably sheet metal, Metallic rod or surface metal conductor.
In the present embodiment, because the length of coupling body 351 is less than filter center frequency quarter-wave, and the end that coupling body 351 extends into the 3rd resonant cavity 333 is suspended in the 3rd resonant cavity 333, so the energy of coupling body 351 couplings is reversed-90 degree.Although so cavity body filter 100 structure basically identicals among the structure of the cavity body filter 300 of present embodiment and the embodiment one, the cavity body filter 300 of present embodiment with embodiment one in the frequency response waveform of cavity body filter 100 different fully.The frequency response waveform of present embodiment cavity body filter 300 as shown in figure 11, in Figure 11, filter response passband upper sideband S(2,1) waveform sink near 2661MHz and 2610MHz, form high attenuation coefficient, make 2661MHz and 2610MHz signal of communication can't pass through filter, to realize filter to the high filtration of 2661MHz and 2610MHz signal, realized two transmission zeros that go out at 2661MHz and 2610MHz.And in prior art as shown in Figure 2, filter only forms transmission zero at the 2661MHz place.Present embodiment is with respect to prior art, under the prerequisite that does not change the filter passband response, can produce many transmission zeros at the filter passband low side, namely produce many transmission zeros in the side less than the filter passband frequency, thereby greatly improved the high-end inhibition strength to clutter of passband, realized when not increasing resonator, making filter that the high-end clutter of passband is suppressed even more ideal.
Certainly, the circuit equivalent structure of present embodiment cavity body filter 300 is still identical with embodiment one, and its concrete structure can be with reference to figure 7.
Embodiment four
As shown in figure 12, the utility model embodiment provides a kind of cavity body filter 400, this cavity body filter 300 is used for the communication radio frequency device, cavity body filter 400 is located at the transceiver circuit part of communication radio frequency device, be used for signal is selected, the communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
On the dividing wall between first metal resonators 410 and the 3rd metal resonators 430, also offer coupling slot 450, be equipped with coupling body 451 in the coupling slot 450, the coupling window 440 between this coupling slot 450 and first metal resonators 410 and the 3rd metal resonators 430 is separated.Coupling body 451 1 ends are connected with first tap 412, and the other end extends in the 3rd resonant cavity 433 at the 3rd metal resonators 430 places.Preferably, coupling body 451 is preferably sheet metal, Metallic rod or surface metal conductor.
In the present embodiment, because the length of coupling body 351 is greater than filter center frequency quarter-wave, the end that coupling body 451 extends in the 3rd resonant cavity 433 is connected with the 3rd resonant cavity 433 or is connected with the 3rd metal resonators 230, so the energy of coupling body 451 couplings is reversed-90 degree.Although so cavity body filter 200 structure basically identicals among the structure of the cavity body filter 400 of present embodiment and the embodiment two, but the cavity body filter of present embodiment 400 with embodiment two in the frequency response waveform of cavity body filter 200 different fully, but it is identical with the frequency response waveform of cavity body filter 300 among the embodiment three, all be to produce many transmission zeros at the filter passband low side, detailed description can referring among the embodiment three to the elaboration of Figure 13.
Thereby present embodiment is with respect to prior art, under the prerequisite that does not change the filter passband response, can produce many transmission zeros at the filter passband low side, namely produce many transmission zeros in the side less than the filter passband frequency, thereby greatly improved the high-end inhibition strength to clutter of passband, realized when not increasing resonator, making filter that the high-end clutter of passband is suppressed even more ideal.
Embodiment five
Present embodiment provides a kind of cavity body filter, this cavity body filter is used for the communication radio frequency device, cavity body filter is located at the transceiver circuit part of communication radio frequency device, is used for signal is selected, and the communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
The cavity body filter of present embodiment comprises the metal resonators of at least three coaxial settings, wherein first metal resonators and second metal resonators are coupled by coupling window, second metal resonators and the 3rd metal resonators are coupled by coupling window, first metal resonators is connected by tap with the filter port, on the dividing wall between first metal resonators and the 3rd metal resonators, also offer at least one coupling slot, be equipped with coupling body in the coupling slot, coupling body one end is connected with tap, and the other end extends in the 3rd resonant cavity at the 3rd metal resonators place.The cavity body filter of present embodiment can be in transmission zero of high-end generation of filter passband, reach the effect of basically identical with prior art among Fig. 1, but present embodiment unlike the prior art be, coupling body one end of present embodiment is to be connected with tap, and coupling body is not set in the coupling window of the prior art usually, perhaps the coupling body of She Zhiing can not be connected with tap.The different technical scheme of present embodiment employing can reach the technique effect with the prior art basically identical.
In sum, because filter of the present utility model is provided with a coupling window and a coupling slot between first metal resonators and the 3rd metal resonators.Wherein, first coupling window and coupling window structure of the prior art and position, effect are identical, are used for forming transmission zero; Be equipped with coupling body in the coupling slot, coupling body one end is connected with tap, the other end extends in the 3rd resonant cavity at the 3rd metal resonators place, the energy of electromagnetic field of first metal resonators thereby the feasible filter port that is connected with tap not only can be coupled, the energy of electromagnetic field of the 3rd metal resonators that also can be coupled simultaneously, be equivalent between filter port and the 3rd metal resonators, reload a phase place and be the impedance variation device of+90 degree or phase place-90 degree, through circuit synthesis and electromagnetic-field simulation demonstration, sort circuit and structural change can make the frequency response of filter change, under the prerequisite that does not change the filter passband response, can produce many transmission zeros at the low side of the high-end of filter passband frequency or filter passband frequency, thereby greatly improved the high-end inhibition strength to clutter of passband, realized when not increasing resonator, making filter that the high-end clutter of passband is suppressed even more ideal.
In the above-described embodiments, only the utility model has been carried out exemplary description, but those skilled in the art can carry out various modifications to the utility model after reading present patent application under the situation that does not break away from spirit and scope of the present utility model.
Claims (12)
1. cavity body filter, the metal resonators that comprises at least three coaxial settings, first metal resonators wherein, any two in second metal resonators and the 3rd metal resonators are coupled by coupling window respectively, described first metal resonators is connected by tap with the filter port, it is characterized in that, on the dividing wall between described first metal resonators and described the 3rd metal resonators, also offer at least one coupling slot, be equipped with coupling body in the described coupling slot, coupling body one end is connected with described tap, and the other end extends in the 3rd resonant cavity at described the 3rd metal resonators place.
2. cavity body filter according to claim 1, it is characterized in that, the length of described coupling body is less than filter center frequency quarter-wave, and the end that described coupling body extends in the 3rd resonant cavity is connected with described the 3rd resonant cavity or is connected with described the 3rd metal resonators, to form transmission zero at described high side of filter passband.
3. cavity body filter according to claim 2, it is characterized in that, described coupling body extend into that a end in the 3rd resonant cavity is connected with cavity bottom, the chamber wall of described the 3rd resonant cavity or, described coupling body extends into the position connection of corresponding described the 3rd resonant cavity on the interior end of the 3rd resonant cavity and the filter cover board.
4. cavity body filter according to claim 1, it is characterized in that, the length of described coupling body is greater than filter center frequency quarter-wave, the end that described coupling body extends into the 3rd resonant cavity is suspended in described the 3rd resonant cavity, to form transmission zero at described high side of filter passband.
5. cavity body filter according to claim 1, it is characterized in that, the length of described coupling body is greater than filter center frequency quarter-wave, and the end that described coupling body extends in the 3rd resonant cavity is connected with described the 3rd resonant cavity or is connected with described the 3rd metal resonators, to form transmission zero at described filter passband low side.
6. cavity body filter according to claim 5, it is characterized in that, described coupling body extend into that a end in the 3rd resonant cavity is connected with cavity bottom, the chamber wall of described the 3rd resonant cavity or, described coupling body extends into the position connection of corresponding described the 3rd resonant cavity on the interior end of the 3rd resonant cavity and the filter cover board.
7. cavity body filter according to claim 1, it is characterized in that, the length of described coupling body is less than filter center frequency quarter-wave, the end that described coupling body extends into the 3rd resonant cavity is suspended in described the 3rd resonant cavity, to form transmission zero at described filter passband low side.
8. cavity body filter according to claim 7 is characterized in that, described coupling body is sheet metal, Metallic rod or surface metal conductor.
9. according to each described cavity body filter of claim 1～8, it is characterized in that described first metal resonators, second metal resonators and described the 3rd metal resonators are isosceles or triangular arranged.
10. communication radio frequency device, it is characterized in that, described communication radio frequency device comprises according to each described cavity body filter of claim 1～9, described cavity body filter is located at the transceiver circuit part of described communication radio frequency device, be used for signal is selected, described communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
11. cavity body filter, the metal resonators that comprises at least three coaxial settings, wherein first metal resonators and second metal resonators are coupled by coupling window, described second metal resonators and the 3rd metal resonators are coupled by coupling window, described first metal resonators is connected by tap with the filter port, it is characterized in that, on the dividing wall between described first metal resonators and described the 3rd metal resonators, also offer at least one coupling slot, be equipped with coupling body in the described coupling slot, coupling body one end is connected with described tap, and the other end extends in the 3rd resonant cavity at described the 3rd metal resonators place.
12. communication radio frequency device, it is characterized in that, described communication radio frequency device comprises cavity body filter according to claim 11, described cavity body filter is located at the transceiver circuit part of described communication radio frequency device, be used for signal is selected, described communication radio frequency device is single multiplexer, duplexer, splitter, mixer or tower amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039793 CN203180026U (en) | 2013-01-24 | 2013-01-24 | Cavity filter and communication radio frequency device |
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| CN 201320039793 CN203180026U (en) | 2013-01-24 | 2013-01-24 | Cavity filter and communication radio frequency device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972622A (en) * | 2013-01-24 | 2014-08-06 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN107210509A (en) * | 2014-10-17 | 2017-09-26 | 株式会社Kmw | Multimode resonator |
| CN113054372A (en) * | 2019-12-27 | 2021-06-29 | 深圳市大富科技股份有限公司 | Communication device and filter thereof |
-
2013
- 2013-01-24 CN CN 201320039793 patent/CN203180026U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972622A (en) * | 2013-01-24 | 2014-08-06 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN103972622B (en) * | 2013-01-24 | 2019-03-01 | 深圳市大富科技股份有限公司 | A kind of cavity body filter and communication radio frequency device |
| CN107210509A (en) * | 2014-10-17 | 2017-09-26 | 株式会社Kmw | Multimode resonator |
| CN107210509B (en) * | 2014-10-17 | 2019-11-15 | 株式会社Kmw | Multimode resonator |
| CN113054372A (en) * | 2019-12-27 | 2021-06-29 | 深圳市大富科技股份有限公司 | Communication device and filter thereof |
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