CN113659297A - High Power Microwave Equalizer - Google Patents
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- CN113659297A CN113659297A CN202110936926.1A CN202110936926A CN113659297A CN 113659297 A CN113659297 A CN 113659297A CN 202110936926 A CN202110936926 A CN 202110936926A CN 113659297 A CN113659297 A CN 113659297A
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Abstract
The invention provides a high-power microwave equalizer, comprising: the device comprises a shell, a plurality of cascaded adjustable resonant cavities, a plurality of axial adjusting screws, a plurality of adjustable nuts, a cover plate, a ferrite wave-absorbing rod, a top adjusting screw, a through transmission line, a medium substrate and two coaxial ports, wherein an accommodating space is formed between the plurality of adjustable resonant cavities and the back wall of the shell, and the medium substrate is arranged in the accommodating space; the straight-through transmission line is arranged on the dielectric substrate and obtained by etching a spur line on the microstrip line, the slotting shape of the spur line is L-shaped, the two coaxial ports are respectively arranged on the left wall and the right wall of the shell, and the spur line penetrates through the two coaxial ports. Therefore, the spurs and the tunable resonator are combined to form the high-power microwave equalizer, and the spurs are used as the through transmission lines, so that the load transmission characteristic is realized, the number of cascaded tunable resonator is reduced, the size of the equalizer is further reduced, and the debugging workload is reduced.
Description
Technical Field
The invention relates to the technical field of microwave passive devices, in particular to a high-power microwave equalizer.
Background
Microwave amplitude equalizers (equalizers) are commonly used in amplifier circuits of communication or radar systems to smooth out gain fluctuations within the operating frequency band. The microwave amplitude equalizer can generate an attenuation curve opposite to the original circuit gain frequency response curve, so that the circuit outputs flat microwave power.
The equalizer has special requirements for different frequency bands, different products and different working environments, and all problems are difficult to solve by using a general theory and a design method. Therefore, it is often necessary to construct an optimized physical model to simulate the calculations to make up for the theoretical deficiency. The adjustable range of the attenuation amplitude of the equalizer is increased, the working stability of the equalizer is improved, the equalizer can adapt to the adjustment requirement of a complex equalization curve, and meanwhile, the equalizer is low in insertion loss, return loss and production cost, and is a constant pursuit in the field of equalizer design.
Disclosure of Invention
Microwave amplitude equalizers (equalizers) are commonly used in amplifier circuits of communication or radar systems to smooth out gain fluctuations within the operating frequency band. The microwave amplitude equalizer can generate an attenuation curve opposite to the original circuit gain frequency response curve, so that the circuit outputs flat microwave power. The general Theory of transmission line equalizers was first introduced in 1969 by E.G.Cristal (E.G.Cristal.theory and design of transmission line all-pass equalizers. IEEE Transactions on Microwave Theory and technique.1969; 17(1):28-38), after which researchers designed various equalizers using different techniques. For example, E.Song et al (E.Song, et al. wind-based passive equalizer design on PCB base on near-end cross talk and transitions for 12.5Gbps serial data transmission. IEEE micro. Wireless Compound. Lett.2018; 18(12): 794. sup. 796.) use a tightly coupled transmission line structure to implement a broadband passive equalizer that can accurately control the amount of attenuation, but that can only withstand low power. Y.Shim et al (Y.Shim, et al. Acompact and wireless broadband passive equalizer designing a stub with a defective ground structure for high speed data transmission. IEEE micro. Wireless company.Lett.2010; 20(5):256-258.) propose to design a compact broadband passive equalizer with a branched line with a defective structure, which is based on reflection under the slow wave effect and can only withstand low power. Patent CN207992840U discloses a microwave equalizer with self-protection function, which is provided with an automatic circuit breaker to prevent the microwave equalizer body from being overloaded and causing the damage of the body. This structure has set up the circulation cooling tube, and the complexity is high, and the volume is on the large side, and stability is relatively poor. Patent CN208226060U discloses a variable slope microwave equalizer, which comprises a metal ground wire, a dielectric layer, a thin film resistor, a metal wire, a capacitor and a gold wire. The amplitude adjusting range of the structure is small, the adjustable range of an S21 curve at a low frequency is-4 to-9 dB, the balance slope can be adjusted (the maximum adjusting range is 5dB), and the adjustable range is not adjustable at a high frequency, so that the structure is not suitable for the condition that a transmission curve (S21) is complex. CN208062229U discloses a broadband adjustable high-power microwave equalizer, in which a microwave resonator is loaded on a microwave transmission line every quarter wavelength, a resonance branch is loaded on a main transmission line to form a microwave resonator, a microwave absorbing material is added in a coaxial cavity to transmit valley points, and a specific equilibrium curve can be formed by matching multiple stages of resonance branches. The patent CN202564518U provides a microwave equalizer, which uses the on/off of a Micro Electro Mechanical System (MEMS) switch to achieve the purpose of controlling the lengths of transmission lines of the microwave equalizer, so as to realize the conversion between different equalization curves.
In the related art, when the equalizer is required to realize a complex transmission curve, a large number of enough coaxial resonant cavities need to be cascaded to realize the complex transmission curve, so that the volume of the microwave equalizer is obviously increased, a large number of tuning screws are also increased, great debugging workload is brought, and the cost is high.
In order to solve the technical problem, the invention provides a high-power microblog equalizer.
The technical scheme adopted by the invention is as follows:
the embodiment of the invention provides a high-power microblog equalizer, which comprises: the tunable resonant cavity comprises a shell, a plurality of cascaded tunable resonant cavities, a plurality of axial tuning screws, a plurality of tunable nuts, a cover plate, a ferrite wave-absorbing rod, top tuning screws, a through transmission line, a dielectric substrate and two coaxial ports, wherein the tunable resonant cavities, the axial tuning screws and the tunable nuts are arranged in a one-to-one correspondence manner, the cascaded tunable resonant cavities are positioned in the shell, the axial tuning screws are arranged in the corresponding resonant cavities, the tunable nuts are arranged at the front ends of the corresponding axial tuning screws, the cover plate covers the tunable resonant cavities, the ferrite wave-absorbing rod and the top tuning screws are arranged on the cover plate and are inserted into the tunable resonant cavities through the cover plate, two adjacent tunable resonant cavities are spaced by a partition plate, and a gap is formed between each partition plate and the back wall of the shell, an accommodating space is formed between the plurality of adjustable resonant cavities and the rear wall of the shell, the dielectric substrate is arranged in the accommodating space, the through transmission line is arranged on the dielectric substrate and is obtained by etching a spur line on a microstrip line, the slotting shape of the spur line is L-shaped, the two coaxial ports are respectively arranged on the left wall and the right wall of the shell, and the spur line penetrates through the two coaxial ports.
In addition, the high-power microwave equalizer proposed according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the resonant frequency of the barbed wire is related to the slotted length of the barbed wire, wherein the longer the slotted length, the smaller the resonant frequency.
According to one embodiment of the invention, the resonance point of the spur line is located at the upper frequency of the adjustable operating frequency range.
According to one embodiment of the invention, the slitting width W of the barbed wire iscHas a range of 0.2mm to 0.4mm and a slit length Lc1Has a range of 24mm to 32mm and a slit height Lc2The range of (A) is 0.4mm to 0.8 mm.
According to one embodiment of the invention, the slitting width W of the barbed wire isc0.3mm, length of slit Lc128.4mm and a slit height Lc2＝0.6mm。
According to one embodiment of the invention, the length L of each resonant cavity ranges from 20mm to 40mm, the height H ranges from 10mm to 13mm, and the length L of the adjustable nut ranges fromsThe range of the ferrite wave-absorbing rod is 9-11 mm, and the distance L between the ferrite wave-absorbing rod and the top adjusting screw1Is 20 mm-23 mm, and the distance L between the top adjusting screw and the adjustable nut2The range of (a) is 14 mm-16 mm, and the range of the diameter d of the axial adjusting screw is 2 mm-3 mm.
According to one embodiment of the invention, the dielectric substrate is a Rogers5880 substrate having a thickness of 0.508 mm.
According to an embodiment of the invention, the microstrip line has a width W0＝1.55mm。
According to one embodiment of the invention, the characteristic impedance of the input and output ports of the through transmission line is 50 ohms.
According to one embodiment of the present invention, the plurality of cascaded tunable resonant cavities is 13 cascaded tunable resonant cavities.
According to the technical scheme of the embodiment of the invention, the spurs and the tunable resonant cavities are combined to form the high-power microwave equalizer, and the spurs are used as the through transmission lines, so that the load transmission characteristic is realized, the number of cascaded tunable resonant cavities is reduced, the size of the equalizer is further reduced, and the debugging workload is reduced.
Drawings
Fig. 1 is a top view of a barbed wire structure according to an embodiment of the present invention.
Fig. 2 is a schematic circuit model diagram of a parallel coupled transmission line according to an embodiment of the invention.
Fig. 3 is a schematic diagram of an equivalent parallel coupling transmission line circuit model of a spurline according to an embodiment of the present invention.
Fig. 4 is an exploded view of the high power microwave equalizer according to the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a single-cavity microwave equalizer according to an embodiment of the present invention.
Fig. 6 is a graph showing the field strength distribution inside a single-cavity microwave equalizer according to an example of the present invention, with or without an axial tuning screw.
Fig. 7 is a schematic diagram of the transmission characteristic of the single-cavity microwave equalizer according to an example of the present invention according to the variation of the distance g between the axial tuning screw and the through transmission line.
FIG. 8 is a graphical illustration of the effect of the slot length of a spurline on the resonant frequency of an example of the present invention.
Fig. 9 is a diagram illustrating a comparison of the actual measurement results of the spur line as the through transmission line and the microstrip line as the through transmission line according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the spur used in the embodiment of the present invention is a simple and compact coplanar microstrip line defect structure, and is often used in filter design. Fig. 1 is a plan view of a bur line obtained by etching an L-shaped slit in a microstrip line, and a copper-clad ground plane is provided on the back surface.
In the embodiment of the invention, the spur line can be analyzed through a parallel coupling transmission line network. Fig. 2 shows a parallel coupled transmission line network model, and according to the parallel coupled transmission line theory, the impedance matrix of the non-uniform network can be represented as:
wherein Z0e、Z0oCharacteristic impedances of the even and odd modes, theta, respectivelye,、θoEven and odd mode electrical lengths, respectively.
In the case of a spurt line, it can be equivalent to a parallel coupled transmission line loaded with termination conditions as shown in fig. 3, and its port voltage and current are:
substituting the terminal condition of the spur line into the impedance matrix of the parallel coupling transmission line network can obtain the voltage and current of the two-port network
From the formula (3), the spur line can be equivalent to a series structure of two transmission lines, wherein the characteristic impedance of one transmission line is Z0eA electrical length of Z0e/2, the characteristic impedance of another transmission line is Z0oA/2, electrical length of θo. For short-circuited branch lines, when θoThe impedance is infinite pi/2, when thetaoIts impedance is zero when pi.
Based on the spurs, the embodiment of the invention provides a high-power microwave equalizer. The number of resonant cavities can be reduced while a complex transmission curve is realized, so that the size of the equalizer is reduced, the debugging workload is reduced, and the cost is lower.
Fig. 4 is a schematic diagram of a high-power microwave equalizer according to an embodiment of the present invention.
As shown in fig. 4, the high power microwave equalizer includes: the device comprises a shell 1, a plurality of cascaded adjustable resonant cavities, a plurality of axial adjusting screws 3, a plurality of adjustable nuts 4, a cover plate 5, a ferrite wave-absorbing rod 6, a top adjusting screw 7, a straight-through transmission line 8, a dielectric substrate 9 and two coaxial ports 10.
The adjustable resonant cavities 2, the axial adjusting screws 3 and the adjustable nuts 4 are arranged in a one-to-one correspondence manner, the cascade adjustable resonant cavities 2 are located in the shell 1, the axial adjusting screws (also called as tuning screws) 3 are arranged inside the corresponding resonant cavities 2, the adjustable nuts 4 are arranged at the front ends of the corresponding axial adjusting screws 3 (the ends of the resonant cavities, which are far away from the rear wall of the shell in the axial direction), the adjustable nuts 4 are used for adjusting the cavity volumes of the corresponding resonant cavities 2, and the axial adjusting screws 3 are used for adjusting the frequency and quality factors of the corresponding resonant cavities 2; the cover plate 5 covers the plurality of adjustable resonant cavities 2, the ferrite wave-absorbing rod 6 and the top adjusting screw 7 (also called as a tuning screw at the top) are arranged on the cover plate 5 and are inserted into the adjustable resonant cavities 2 through the cover plate 5, and the top adjusting screw 7 is used for adjusting the amplitude of a frequency response curve; two adjacent tunable cavities 2 are spaced by a partition plate, wherein a gap is formed between each partition plate and the rear wall of the housing 1, so that an accommodating space is formed between the tunable cavities 2 and the rear wall of the housing 1, the dielectric substrate 9 is arranged in the accommodating space, the through transmission line 8 (the characteristic impedance of the input and output ports of the through transmission line is 50 ohms) is printed on the dielectric substrate 9 (the dielectric substrate is a Rogers5880 substrate with the thickness of 0.508mm) by adopting a PCB process, the through transmission line 8 is obtained by etching a spur line on a microstrip line, the slot shape of the spur line is L-shaped, the two coaxial ports 10 are respectively arranged on the left wall and the right wall of the housing 1, and the spur line passes through the two coaxial ports 10.
Specifically, in practical applications, when the amplitude of the transmission system needs to be equalized to enable the transmission system to output flat microwave power, the high-power microwave equalizer provided by the embodiment of the present invention is adopted, that is, the equalizer is controlled to generate an attenuation curve opposite to a gain frequency response curve of an original transmission system, so that the system outputs flat microwave power. The transmission curve of the equalizer is adjusted by adjusting the structural parameters of the spurline and the structural parameters of the adjustable resonant cavity, wherein when the structural parameters of the spurline are adjusted, the adjustment of the resonant frequency of the spurline is realized.
In this embodiment, referring to fig. 4, three screw holes are provided at positions on the cover plate 5 corresponding to the longitudinal axis of each tunable cavity 2, the three screw holes are located right above the axial adjusting screw 3, and the ferrite wave-absorbing rod 6 and the top adjusting screw 7 are inserted into the tunable resonant cavity 2 through the corresponding screw holes at different positions.
The equalizer in the embodiment of the present invention includes a plurality of cascaded tunable resonators 2, and in order to illustrate the function of the tunable resonators 2 in the equalizer, the embodiment of the present invention illustrates the operating principle of a single-cavity microwave equalizer (an equalizer having only one tunable resonator). The structure of the single-Cavity microwave equalizer is shown in fig. 5, the volume of the Cavity (Cavity) can be rapidly changed by using the adjustable nut 4, and the resonant frequency and the quality factor of the Cavity can be finely adjusted by using the axial adjusting nut 3. The ferrite wave-absorbing rod on the top is used for absorbing microwave energy and increasing attenuation; the top tuning screw can further fine tune the amplitude of the frequency response curve.
The system function formula of the equivalent circuit of the single-cavity microwave equalizer is as follows:
wherein Z is0Is the characteristic impedance of the transmission line, ω is the operating angular frequency, and R, L, C is the equivalent resistance, inductance, and capacitance, respectively, of the structure. FIG. 6 is a diagram showing the field intensity distribution of the single-cavity microwave equalizer with or without an axial tuning screw (no axial tuning screw in the left figure, and an axis in the right figure)Nutlet adjustment). As can be seen from fig. 6, if there is no axial adjusting screw in the cavity, the electromagnetic field passing through in the horizontal direction cannot be coupled into the cavity, and after the axial adjusting screw is loaded, the electromagnetic field is coupled into the cavity and resonates in the TE101 mode. Referring to fig. 5, there is a distance g between the axial tuning screw 3 and the through transmission line in each resonator 2, and fig. 7 further shows that the transmission characteristics of the single-cavity microwave equalizer vary with the distance g between the axial tuning screw and the through transmission line, and it can be seen from fig. 7 that when g is 1.5mm, g is 1.3mm, and g is 1.1mm, the transmission characteristics of the corresponding equalizer sequentially move leftward, that is, as the distance g decreases, the resonance frequency of the equalizer moves leftward, that is, as the distance g decreases, the resonance frequency of the equalizer decreases, and further, the attenuation increases.
According to the single-cavity microwave equalizer, the resonant frequency and the transmission curve can be obtained, and a plurality of transmission curves are superposed (namely, a plurality of adjustable single-cavity microwave equalizers are cascaded) to obtain a more complex transmission curve.
In the embodiment of the present invention, a plurality of cascaded tunable cavities 2 are adopted, wherein the distance g between the axial tuning screw corresponding to each tunable cavity 2 and the through transmission line may be equal or unequal. When the gaps between the axial tuning screw and the through transmission line are equal or nearly equal, the multiple resonance curves will add together, resulting in greater attenuation at the resonance frequency point.
That is to say, the present invention provides an equalizer based on a spurline and a tunable resonant cavity, according to the working principle of the spurline, the spurline can be regarded as a resonator, and in the embodiment of the present invention, the spurline is used as a through transmission line of a microwave equalizer, the transmission characteristic of the spurline can be changed by adjusting the length of the slot of the spurline, and meanwhile, the structural parameters of the tunable resonant cavity 2 can be adjusted to increase the power attenuation tunable range of the high-power microwave equalizer, so that the equalizer can further adapt to more complex microwave transmission curves, further reduce the volume of the equalizer, and make the debugging process simpler and more effective.
Therefore, the spurs and the tunable resonator are combined to form the high-power microwave equalizer, and the spurs are used as the through transmission lines, so that the load transmission characteristic is realized, the number of cascaded tunable resonator is reduced, the size of the equalizer is further reduced, and the debugging workload is reduced.
In one embodiment of the invention, the resonant frequency of the spurs is related to the length of the slots of the spurs, wherein the longer the slot length, the smaller the resonant frequency.
In particular, the spurt line can be further viewed as a resonator with the slotted slot being a capacitor and the metal line itself being an inductor. Therefore, by adjusting the length L of the slit of the barbed wirec1Its transmission characteristics can be changed. Fig. 8 shows the relationship between the resonant frequency of the spurs and the length of the slot. As can be seen, the resonant frequency gradually decreases as the slot length increases.
In the related art, it is difficult to realize large attenuation of the microwave equalizer in the upper frequency band, and to meet the transmission response of any setting, enough adjustable resonant cavities need to be cascaded, which can significantly increase the volume of the microwave equalizer, and also increase many tuning screws, resulting in great debugging workload.
For this reason, in one embodiment of the present invention, the resonance point of the spurline is located at the upper frequency of the tunable operating frequency range, so that the attenuation at high frequencies can be greatly increased and the number of tunable resonators required can be significantly reduced.
The adjustable working frequency range can be determined according to indexes which can be achieved by specific actual needs.
In particular, the structural parameters of the barbed wire (as labeled in FIG. 1: slit width W)cLength L of slotc1Height L of slitc2And microstrip line width W0) And structural parameters corresponding to the tunable cavity 2 (e.g., length L, height H of the resonant cavity, length L of the adjustable nut)sThe distance L between the ferrite wave-absorbing rod and the top adjusting screw1The distance L between the top adjusting screw and the adjustable nut2The diameter d of the axial turnbuckle) to achieve a resonance point for the spur wire (as noted in fig. 5: frequency point when resonance occurs) is adjusted, the specific resonance point to be adjusted is based onThe practical requirement is determined, in order to realize large attenuation of the microwave equalizer in the upper frequency band, the resonance point of the spurline is adjusted to the upper frequency of the adjustable frequency range. For example, when the adjustable operating frequency is 5 GHz-6 GHz, the resonance point can be designed at 6 GHz.
In one embodiment, in an embodiment of the present invention, the slit width W of the barbed wirecHas a range of 0.2mm to 0.4mm and a slit length Lc1Has a range of 24mm to 32mm and a slit height Lc2The range of (A) is 0.4mm to 0.8 mm.
The length L of each resonant cavity ranges from 20mm to 40mm, the height H ranges from 10mm to 13mm, and the length L of the adjustable nutsThe range of the ferrite wave-absorbing rod is 9mm to 11mm, and the distance L between the ferrite wave-absorbing rod and the top adjusting screw1The range of the adjusting screw is 20 mm-23 mm, and the distance L between the top adjusting screw and the adjustable nut2The range of (a) is 14 mm-16 mm, and the range of the diameter d of the axial adjusting screw is 2 mm-3 mm.
In one example, the parameters of the spur line may be: wc＝0.3mm、Lc128.4mm and Lc20.6 mm. Width W of microstrip line0＝1.55mm。
Furthermore, the length L of each resonant cavity is 30mm, the height H is 12mm, and the length L of the nut can be adjusteds10mm, the distance L between the ferrite wave absorbing rod and the top adjusting screw122.5mm, the distance L between the top adjusting screw and the adjustable nut2The diameter d of the axial adjusting screw is 2.5 mm.
In particular, by designing the resonance point of the spurs and the tunable cavities with the specific parameter values in this example at the upper frequency, the attenuation at high frequencies can be greatly improved, i.e. the number of cascaded tunable cavities required to achieve the desired complex transmission characteristics (e.g. the required attenuation at high frequencies) can be significantly reduced compared to the prior art.
In order to prove the advantages of the high-power microwave equalizer provided by the embodiment of the invention, the spur line is used as a through transmission line, and the microstrip line is used as a through transmission line for comparison. Wherein both the spure line and the microstrip line are printed on the dielectric substrate by adopting a PCB process (R)An igers 5880 sheet, thickness h 0.508mm), characteristic impedance of the input/output port of 50 ohms, and a specific parameter of the spurt line W01.55mm, Wc 0.3mm, Lc1 28.4mm, and Lc2 0.6 mm. Fig. 9 shows a comparison of actual test results of the two, in which the microwave equalizer using the spur line as the through transmission line only uses 13 coaxial resonators to achieve the expected complex transmission characteristics (for example, attenuation at high frequency is required to be large), and the microwave equalizer using the microstrip line as the through transmission line uses 17 coaxial resonators to achieve the expected complex transmission characteristics, and the volume is about 30% larger than that of the former, and it can be seen that, under the condition that the expected load transmission characteristics can be achieved, the volume of the high-power microwave equalizer of the embodiment of the present invention can be significantly reduced, thereby reducing the production cost and reducing the debugging workload.
According to the embodiment of the invention, through software system simulation and actual combined debugging and testing, the result shows that the cavity equalizer based on the spur wire is small in size and good in technical performance, and the required complex transmission characteristic can be quickly and accurately obtained. And the structure is simple, the production cost is low, the maintenance is convenient, and the application value is good.
In summary, the attenuation of the conventional cascaded coaxial resonant cavity-based microwave equalizer that uses a microstrip line, a suspension line, or a metal rod as a through transmission line is very small at a high frequency, and in order to implement complex transmission characteristics (for example, the attenuation at the high frequency is required to be large), many coaxial cavities must be cascaded, which increases the volume of the microwave equalizer, and at the same time, more tuning screws also bring more complex tuning, and the cost is very high. The high-power microwave equalizer provided by the embodiment of the invention has the following advantages and beneficial effects:
(1) in the embodiment of the invention, the spur line structure is adopted as the through transmission line, so that the complex transmission characteristic can be realized, for example, resonance is carried out at a high frequency position where large attenuation is difficult to realize, and the complex transmission characteristic of the microwave amplitude equalizer can be quickly and effectively realized.
(2) In the embodiment of the invention, the microwave amplitude equalizer is realized by combining the spurline structure and the coaxial resonant cavity structure, so that the number and the total volume (about 30 percent) of the resonant cavities can be obviously reduced, and the debugging and production cost is reduced.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
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| CN202110936926.1A Pending CN113659297A (en) | 2021-08-16 | 2021-08-16 | High Power Microwave Equalizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114899565A (en) * | 2022-05-26 | 2022-08-12 | 南京国睿防务系统有限公司 | A Broadband High Power Forward Slope Equalizer |
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| JP2008060901A (en) * | 2006-08-31 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Transmission-line resonator, high-frequency filter using it, high-frequency module and radio equipment |
| CN105225906A (en) * | 2015-09-10 | 2016-01-06 | 电子科技大学 | A kind of miniaturized gainequalizer based on micro-imperfect structure |
| CN111129680A (en) * | 2019-12-30 | 2020-05-08 | 南京邮电大学 | Broadband adjustable equalizer based on coaxial resonant cavity |
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| JP2008060901A (en) * | 2006-08-31 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Transmission-line resonator, high-frequency filter using it, high-frequency module and radio equipment |
| CN105225906A (en) * | 2015-09-10 | 2016-01-06 | 电子科技大学 | A kind of miniaturized gainequalizer based on micro-imperfect structure |
| CN111129680A (en) * | 2019-12-30 | 2020-05-08 | 南京邮电大学 | Broadband adjustable equalizer based on coaxial resonant cavity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114899565A (en) * | 2022-05-26 | 2022-08-12 | 南京国睿防务系统有限公司 | A Broadband High Power Forward Slope Equalizer |
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Application publication date: 20211116 |