CN111384534A - A three-pass band power division filter - Google Patents

Abstract

The invention discloses a three-way band-pass power division filter, which comprises a dielectric substrate positioned at the upper part and a metal grounding plate positioned at the lower part, wherein an input port feeder line is arranged at one short side of the dielectric substrate, a first port output feeder line and a second port output feeder line are respectively arranged at two long sides of the dielectric substrate, a sixth E-type three-mode resonator, a fourth E-type three-mode resonator and a first E-type three-mode resonator are respectively arranged between the second output port feeder line and the input port feeder line, a fifth E-type three-mode resonator, a third E-type three-mode resonator and a second E-type three-mode resonator are respectively arranged between the first port feeder line and the input port feeder line, an isolation resistor is arranged between the second E-type three-mode resonator and the first E-type three-mode resonator, an isolation resistor is arranged between the fourth E-type three-mode resonator and the third E-type three-mode resonator, and an isolation resistor is arranged between the sixth E-type three-mode resonator and the fifth E-type three-mode resonator.

Description

A three-pass band power division filter

technical field

The invention relates to the technical field of microwave passive devices, in particular to a three-pass band power division filter.

Background technique

In modern wireless communication systems, power dividers and filters are important RF front-end passive components. In order to realize power distribution and filtering functions at the same time, they are often designed in the circuit in a cascaded way. In this way, not only the circuit The volume will increase and the circuit performance will decrease. Therefore, in order to reduce circuit size and improve circuit performance, research on power dividers with filter responses has been explored in recent years. At the same time, with the continuous development of modern wireless communication systems, the demand for multi-passband communication systems has also increased.

Document 1 [K.J.Song, M.Y.Fan, and F.Zhang, "Compact Tripe-Band Power DividerIntegrated Bandpass-Fitering Response Using Short-Circuited SIRs," IEEE Trans.Compon.Packag.Manufact.Techno., vo.7, no. 7, Juy. 2017] by utilizing a coupled short-circuit stepped impedance resonator and a half-wavelength resonator to achieve a three-passband filter response, the three desired passbands can be simultaneously obtained by adjusting the impedance ratio and electrical length. However, due to the complex circuit structure and high port isolation, the problem of poor out-of-band suppression affects the wide application of the power division filter.

Document 2 [C.-F.Chen, T.-Y.Huang, and R.-B.Wu, "Nove compact net-typeresonators and their appications to microstrip bandpass fiters," IEEETrans.Microw.Theory Techn.,vo. 54, no. 2, pp. 755-762, Feb. 2006] By using a mesh three-mode resonator, a multi-passband microstrip filter is simply and efficiently realized without significantly increasing the circuit size. However, due to the limitation of the freedom of design parameters, it is difficult to realize the design requirements for all passbands at the same time, which increases the difficulty of design realization.

Literature 3 [R.Gómez-Garcia, R.oeches-Sanchez, D.Psychogiou, and D.Perouis, "Singe/muti-band Wikinson-type power dividers with embedded transversafitering sections and appication to channeizedfiters," IEEE Trans.CircuitsSyst. I, Reg.Papers, vo.62, no.6, pp.1518-1527, Jun.2015.] proposed a new single/multi-passband Wilkinson power divider with inherent filtering ability, but its circuit The volume is large and the port isolation is poor.

SUMMARY OF THE INVENTION

Purpose of the invention: With the rapid development of information technology, the single-pass band power division filter can no longer meet the application requirements of integrating multiple channels in one system. The complexity of the entire circuit and the volume of the communication equipment can achieve the purpose of simplifying the system and reducing social costs. Therefore, the technical problem to be solved by the present invention is to provide a miniaturized and high-performance three-pass band power division filter for the deficiencies of the prior art.

In order to solve the problems of large size and poor performance of the circuit, the present invention discloses a method of coupling the resonator and the input and output feeders to realize the function of the three-pass band power division filter, which includes a dielectric substrate located at the upper part and a metal grounding plate located at the lower part. A short side of the dielectric substrate is provided with an input port feeder, and two long sides of the dielectric substrate are respectively provided with a first port output feeder and a second port output feeder, and a sixth port is respectively provided between the second output port feeder and the input port feeder E-type three-mode resonator, fourth E-type three-mode resonator, and first E-type three-mode resonator, a fifth E-type three-mode resonator, a fifth E-type three-mode resonator, a fifth E-type three-mode resonator, a fifth E-type three-mode resonator, Three E-type three-mode resonators and a second E-type three-mode resonator, an isolation resistor is provided between the second E-type three-mode resonator and the first E-type three-mode resonator, and the fourth E-type three-mode resonator An isolation resistor is arranged between the resonator and the third E-type three-mode resonator, and an isolation resistor is arranged between the sixth E-type three-mode resonator and the fifth E-type three-mode resonator.

In the present invention, the input port feeder line includes a first 50 ohm microstrip line conducting strip and an input coupling line, one end of the first 50 ohm microstrip line conducting strip is close to the first side of the dielectric substrate, and the other end is connected to the input coupling line; The connection between the conduction strip of a 50-ohm microstrip line and the first side of the dielectric substrate is the input end.

In the present invention, the first output feeder line is composed of a second 50 ohm microstrip line conducting strip and an output coupling line, the second 50 ohm microstrip line conducting strip is close to the second side of the dielectric substrate, and the output coupling line is connected to the second 50 ohm microstrip line. The conduction strip of the ohmic microstrip line is connected, and the conduction strip of the second 50 ohm microstrip line is perpendicular to the input coupling line; the connection between the conduction strip of the second 50 ohm microstrip line and the second side of the dielectric substrate is the first output end

In the present invention, the second output feeder line is composed of a third 50-ohm microstrip line conducting strip and an output coupling line, the third 50-ohm microstrip line conducting strip is close to the third side of the dielectric substrate, and the output coupling line is connected to the third 50-ohm microstrip line. The conduction strip of the ohmic microstrip line is connected, and the conduction strip of the third 50 ohm microstrip line is perpendicular to the input coupling line; the connection between the conduction strip of the 50 ohm microstrip line and the third side of the dielectric substrate (9) is the third output end.

In the present invention, the first E-type three-mode resonator includes a first open-ended stub, a second open-ended stub, and a first E-type open-ended stub;

The two sides of the first E-type open-ended stubs are respectively symmetrically provided with a first L-shaped open-ended stub and a second L-shaped open-ended stub.

In the present invention, the second E-type three-mode resonator includes a third open-ended stub, a fourth open-ended stub, and a second E-type open-ended stub;

Both sides of the second E-type open-ended stub are symmetrically provided with a third L-shaped open-ended stub and a fourth L-shaped open-ended stub.

In the present invention, the third E-type three-mode resonator includes a third E-type open-terminal branch;

A fifth L-shaped open-ended stub and a sixth L-shaped open-ended stub are symmetrically arranged on both sides of the third E-shaped open-ended stub.

In the present invention, the fourth E-type three-mode resonator includes a fourth E-type open-terminal branch;

A seventh L-shaped open-ended stub and an eighth L-shaped open-ended stub are symmetrically arranged on both sides of the fourth E-shaped open-ended stub.

In the present invention, the fifth E-type three-mode resonator includes a fourth E-type open-terminal branch;

A ninth L-type open terminal branch and a tenth L-type open terminal branch are symmetrically arranged on both sides of the fourth E-type open terminal branch;

The sixth E-type three-mode resonator includes a fourth E-type open-terminated branch;

An eleventh L-type open-terminal branch and a twelfth L-type open-terminal branch are symmetrically arranged on both sides of the fourth E-type open-terminal branch.

In the present invention, the first E-type three-mode resonator and the second E-type three-mode resonator are symmetrical on both sides of the input coupling line;

The third E-type three-mode resonator and the fourth E-type three-mode resonator are symmetrical on both sides of the input coupling line;

The fifth E-type three-mode resonator and the sixth E-type three-mode resonator are symmetrical on both sides of the input coupling line.

Beneficial effects: the structure of the present invention is compact, can be realized on a single PCB board, is convenient for processing and integration, and has low production cost. At the same time, the present invention realizes the design of the three-pass-band power division filter by using the method of coupling the resonator and the input and output feeders, and can well realize the miniaturization, low insertion loss, high-bandwidth and External inhibition and other properties. With the increasing demand for multi-standard wireless communication and ensuring high-quality radio frequency communication, the good performance of the three-pass band power division filter is particularly important for the quality of radio frequency communication.

Description of drawings

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the above-mentioned and/or other aspects of the present invention will become clearer.

FIG. 1 is a schematic three-dimensional structure diagram of a power division filter based on an E-type resonator of the present invention.

FIG. 2 is a plan view of FIG. 1 .

FIG. 3 is a schematic view of the structure and dimensions of Embodiment 1. FIG.

FIG. 4 is an S-parameter simulation diagram of Example 1. FIG.

FIG. 5 is an S-parameter simulation diagram of isolation characteristics of two output ports in Embodiment 1. FIG.

In the figure, the input port feeder 1, the metal ground plate 2, the isolation resistor 3, the isolation circuit 4, the second E-type resonator 5, the fourth E-type resonator 6, the second port output feeder 7, the fifth E-type resonator 8. A rectangular dielectric substrate 9 , an isolation resistor 10 , a first E-type resonator 11 , a third E-type resonator 12 , and a sixth E-type resonator 13 .

Detailed ways

Example:

As shown in FIG. 1 and FIG. 2 , a three-pass band power division filter based on an E-type resonator of the present invention includes a metal grounding plate 2 on the lower surface, an input port feeder 1 on the upper surface of a rectangular dielectric substrate 9, The first port outputs the feeder 15, and the second port outputs the feeder 7. The first output port feeder 15 and the second output port feeder 7 are respectively close to two vertically adjacent long sides of the rectangular dielectric substrate 9, and the second output port feeder 7 and the input port feeder 1 An E-type resonator 13611 is provided therebetween, and an E-type resonator 8125 is provided between the first port feeder 6 and the input port feeder 1 . An isolation resistor 3 is provided between the E-type resonators 5 and 11 , an isolation resistor 4 is provided between the E-type resonators 6 and 12 , and an isolation resistor 10 is provided between the E-type resonators 138 . .

A first E-type three-mode resonator 11 , a fourth E-type three-mode resonator 6 and a sixth E-type three-mode resonator 13 are respectively provided between the input port feeder 1 and the second output feeder 7 . The input port feeder 1 includes a first 50 ohm microstrip line conducting strip 17 and an input coupling line 16, one end of the first 50 ohm microstrip line conducting strip 17 is close to the first side 9a of the dielectric substrate 9, and the other end is connected to the input coupling line 16; The connection between the first 50-ohm microstrip line conduction strip 17 and the first side of the dielectric substrate 9 is the input end.

The first output feeder 15 is composed of a second 50-ohm microstrip line conducting strip 18 and an output coupling line 19. The second 50-ohm microstrip line conducting strip 18 is close to the second side 9b of the dielectric substrate 9, and the output coupling line 19 is connected to the second side 9b of the dielectric substrate 9. The second 50-ohm microstrip line conducting strip 18 is connected, and the second 50-ohm microstrip line conducting strip 18 is perpendicular to the input coupling line 16; output.

The second output feeder 7 is composed of a third 50-ohm microstrip line conducting strip 20 and an output coupling line 21. The third 50-ohm microstrip line conducting strip 20 is close to the third side 9c of the dielectric substrate 9, and the output coupling line 21 is connected to the third side 9c of the dielectric substrate 9. The third 50-ohm microstrip line conducting strip 20 is connected, and the third 50-ohm microstrip line conducting strip 20 is perpendicular to the input coupling line 16; output.

The first E-type three-mode resonator 11 includes a first open-terminated branch 22, a second open-terminated branch 23, and a first E-type open-terminated branch 24; The L-shaped open-ended stub 25 and the second L-shaped open-ended stub 26 .

The second E-type three-mode resonator 5 includes a third open-terminated branch 27, a fourth open-terminated branch 28, and a second E-type open-terminated branch 29; The L-shaped open terminated stub 30 and the fourth L-shaped open terminated stub 31 .

The third E-type three-mode resonator 12 includes a third E-type open-terminated branch 32; both sides of the third E-type open-terminated branch 32 are symmetrically provided with a fifth L-shaped open-terminated branch 33 and a sixth L-shaped open-terminated branch 33, respectively. 34.

The fourth E-type three-mode resonator 6 includes a fourth E-type open-terminated branch 35; both sides of the fourth E-type open-terminated branch 35 are symmetrically provided with a seventh L-type open-terminated branch 36 and an eighth L-type terminal. Open branch 37.

The fifth E-type three-mode resonator 8 includes a fourth E-type open-terminated branch 37; both sides of the fourth E-type open-terminated branch 37 are symmetrically provided with a ninth L-type open-terminated branch 38 and a tenth L-type terminal. Open branch 39.

The sixth E-type three-mode resonator 13 includes a fourth E-type open-terminated branch 40; two sides of the fourth E-type open-terminated branch 40 are symmetrically provided with an eleventh L-type open-terminated branch 41 and a twelfth L Type 42 of open terminated stubs.

The first E-type three-mode resonator 11 and the second E-type three-mode resonator 5 are symmetrical on both sides of the input coupling line 16; the third E-type three-mode resonator 12 and the fourth E-type three-mode resonator 6 are coupled at the input Line 16 is symmetrical on both sides; the fifth E-type three-mode resonator 8 and the sixth E-type three-mode resonator 13 are symmetrical on both sides of the input coupling line 16;

The front view is shown in Figure 2, and the relevant dimensions are shown in Figure 3. The dielectric substrate 7 used has a relative dielectric constant of 3.55, a thickness of 0.508 mm, and a loss tangent of 0.0027. ₃ , the size parameters of the power division filter are as follows: L= _5.00 , W=1.12, L1 ₌ 26.42, L2=12.96, L3 _{= 28.04} , L4=11.02, L5=7.30, _L6 = 37.71, _L7 =29.95, _L8 =2.58, _L9 =17.84, _L10 =19.95, _L11 =22.84, _L12 =1.00, _L13 =8.00, _L14 =15.34, _L15 =3.26, W1 ₌ 0.635, _W2 =0.30, W3 ₌ 0.48, _W4 =0.62, D=0.32, g1 ₌ 0.14, g2=0.20, _{g3 =} 0.15, _g4 =0.13, _g5 =0.19, _g6 =0.07 , R ₁ =2400Ω, R ₂ =820Ω, R ₃ =1200Ω.

Figure 4 is the S-parameter simulation diagram of the power division filter in this example. It can be seen from the figure that the center frequencies of the three passbands of the three-passband power division filter are 1.30GHz, 1.62GHz, and 2.22GHz. The internal return loss is less than 13.0dB, and the minimum insertion loss is 1.3dB. There are six transmission zeros outside the passband, which makes the power division filter of this example have good frequency selectivity and out-of-band harmonic rejection.

Figure 5 is the S-parameter simulation diagram of the matching characteristics and isolation characteristics of the two power output ports of the power division filter in this example. It can be seen from the figure that the output port return loss in the passband of the power division filter in this example is low is better than 13.0dB, and the in-band isolation is better than 18.8dB.

The invention processes and corrodes the metal surfaces on the front and back of the circuit substrate through the manufacturing process of the printed circuit board, thereby forming the required metal pattern, and has a simple structure, which can be realized on a single PCB board, and is convenient for processing integration and production. low cost. At the same time, the multi-mode E-type resonator and network topology are used to obtain good power distribution characteristics and filtering characteristics. By cleverly connecting isolation resistors between the resonators, good port isolation characteristics are obtained.

Because the three-pass band power division filter of the present invention simultaneously has high selectivity, compact structure, good port isolation and good out-of-band suppression characteristics, high selectivity, small insertion loss, and good out-of-band suppression performance, it is suitable for modern wireless communication. system.

In this embodiment, the dual-mode E-type resonator and network topology are used to obtain good power distribution characteristics and filtering characteristics, and an isolation resistance is skillfully connected between the resonators to obtain good port isolation characteristics and realize a highly selective, Compact structure, good port isolation and good out-of-band rejection characteristics High selectivity, low insertion loss, good out-of-band rejection three-pass band power division filter, suitable for modern wireless communication systems.

The invention utilizes the resonance mechanism of the branch-loaded multi-mode resonator and the electric field distribution characteristics of the main transmission line, and has the characteristics of high selectivity and wide frequency band.

The present invention utilizes the characteristics of coupling between the main transmission line of one wavelength and the resonator and the characteristics of open-circuit branches to generate zero points, and has good out-of-band suppression characteristics.

The power division filter of the invention utilizes the isolation resistance between the resonators, has good isolation, and is suitable for modern wireless communication systems.

The present invention provides an idea and method for a three-passband power division filter. There are many specific methods and approaches for realizing the technical solution. The above are only the preferred embodiments of the present invention. For those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims (10)

1. A three-pass band power division filter, characterized in that it comprises a dielectric substrate 9 located at the top and a metal ground plate 2 located at the bottom, a short side of the dielectric substrate 9 is provided with an input port feeder (1), and the dielectric substrate 9 is provided with an input port feeder (1). The two long sides are respectively provided with a first port output feeder (15) and a second port output feeder (7), and a sixth E-type feeder is respectively provided between the second output port feeder (7) and the input port feeder (1). A three-mode resonator (13), a fourth E-type three-mode resonator (6) and a first E-type three-mode resonator (11), between the first port feeder (15) and the input port feeder (1) A fifth E-type three-mode resonator (8), a third E-type three-mode resonator (12) and a second E-type three-mode resonator (5) are respectively provided, and the second E-type three-mode resonator ( 5) An isolation resistor (3) is provided between the first E-type three-mode resonator (11), and an isolation resistor (3) is provided between the fourth E-type three-mode resonator (6) and the third E-type three-mode resonator (12). There is an isolation resistor (4), and an isolation resistor (10) is provided between the sixth E-type three-mode resonator (13) and the fifth E-type three-mode resonator (8). 2. A three-pass band power division filter according to claim 1, wherein the input port feeder (1) comprises a first 50-ohm microstrip line conducting strip (17) and an input coupling line (16) ), one end of the first 50 ohm microstrip line conduction strip (17) is close to the first side (9a) of the dielectric substrate (9), and the other end is connected to the input coupling line (16); the first 50 ohm microstrip line conduction strip (17 ) and the first side of the dielectric substrate (9) are connected to the input end. 3. A three-pass band power division filter according to claim 1, characterized in that, the first output feeder (15) consists of a second 50-ohm microstrip line conduction band (18) and an output coupling line ( 19) composition, the second 50-ohm microstrip line conducting strip (18) is close to the second side (9b) of the dielectric substrate (9), and the output coupling line (19) is connected to the second 50-ohm microstrip line conducting strip (18) , the second 50-ohm microstrip line conducting strip (18) is perpendicular to the input coupling line (16); the connection between the second 50-ohm microstrip line conducting strip (18) and the second side of the dielectric substrate 9 is the first output end. 4. A three-pass band power division filter according to claim 1, characterized in that, the second output feeder (7) consists of a third 50-ohm microstrip line conduction band (20) and an output coupling line ( 21) composition, the third 50-ohm microstrip line conducting strip (20) is close to the third side (9c) of the dielectric substrate (9), and the output coupling line (21) is connected to the third 50-ohm microstrip line conducting strip (20) , the third 50-ohm microstrip line conducting strip (20) is perpendicular to the input coupling line (16); the connection between the 50-ohm microstrip line conducting strip (20) and the third side of the dielectric substrate (9) is the third output end. 5. A three-passband power division filter according to claim 1, wherein the first E-type three-mode resonator (11) comprises a first open-ended branch (22), a second open-ended a branch (23), a first E-type terminal open branch (24); Both sides of the first E-type open-ended stubs (24) are symmetrically provided with first L-shaped open-ended stubs (25) and second L-shaped open-ended stubs (26). 6. A three-pass band power division filter according to claim 1, characterized in that the second E-type three-mode resonator (5) comprises a third open-terminal branch (27), a fourth open-terminal branch a branch (28), a second E-type terminal open circuit branch (29); A third L-shaped open-ended stub (30) and a fourth L-shaped open-ended stub (31) are symmetrically arranged on both sides of the second E-shaped open-ended stub (29). 7. A three-passband power division filter according to claim 1, wherein the third E-type three-mode resonator (12) comprises a third E-type open-terminated branch (32); A fifth L-shaped open-ended stub (33) and a sixth L-shaped open-ended stub (34) are symmetrically arranged on both sides of the third E-shaped open-ended stub (32). 8. A three-passband power division filter according to claim 1, wherein the fourth E-type three-mode resonator (6) comprises a fourth E-type open-terminated branch (35); A seventh L-shaped open-ended stub (36) and an eighth L-shaped open-ended stub (37) are symmetrically arranged on both sides of the fourth E-shaped open-ended stub (35). 9. A three-passband power division filter according to claim 1, wherein the fifth E-type three-mode resonator (8) comprises a fourth E-type open-terminated branch (37); A ninth L-type open-terminal branch (38) and a tenth L-type open-terminal branch (39) are symmetrically arranged on both sides of the fourth E-type open terminal branch (37); The sixth E-type three-mode resonator (13) includes a fourth E-type open-terminated branch (40); An eleventh L-shaped open-terminated stub (41) and a twelfth L-shaped open-ended stub (42) are symmetrically arranged on both sides of the fourth E-type open-terminated stub (40). 10. A three-pass band power division filter according to claim 1, characterized in that, the first E-type three-mode resonator (11) and the second E-type three-mode resonator (5) are at the input The coupling line (16) is symmetrical on both sides; The third E-type three-mode resonator (12) and the fourth E-type three-mode resonator (6) are symmetrical on both sides of the input coupling line (16); the fifth E-type three-mode resonator (8) and the sixth E-type three-mode resonator (8) The three-mode resonator (13) is symmetrical on both sides of the input coupling line (16).

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