CN109713410B - Microstrip wide stop band duplexer - Google Patents
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Abstract
The invention discloses a microstrip wide stop band duplexer which is manufactured on a double-sided copper-clad dielectric plate, wherein one side surface of the double-sided copper-clad dielectric plate is a microstrip line layer, and the other side surface of the double-sided copper-clad dielectric plate is a copper-clad ground plate; the microstrip line layer is respectively provided with an input port, a first output port, a second output port, a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator; each resonator is a quarter-wave short-circuited resonator. The first resonator, the second resonator and the third resonator are the same group of resonators and work at 2.5GHz; the fourth, fifth and sixth resonators are another group of resonators operating at 2GHz. The invention realizes the characteristics of the duplexer by utilizing the two groups of resonators, generates zero point near the passband to improve the selectivity, has smaller harmonic wave, clutter signal interference and wider stopband, has simple and compact overall design, small volume and low cost, and can be suitable for various communication systems.
Description
Technical Field
The invention relates to the technical field of planar microstrip filters, in particular to a microstrip wide stop band duplexer.
Background
The wireless communication technology is rapidly developed, the division among the frequency bands is finer and finer, and the interference phenomenon among the communication frequency bands is more and more serious, so that the performance of the band-pass filter determines the working quality of the communication system. The band-pass filter is used for allowing waves in a specific frequency band to pass through and shielding other frequency bands, and mainly works at a front stage of a signal transmitting end and a rear stage of a signal receiving end, and is used for restraining harmonic waves and clutter signals and guaranteeing purity of required signals. In a communication system, a port may input signals of different frequencies, which may need to be processed by a different system. Therefore, one of the effective approaches is to research and develop a high-performance duplexer.
In recent years, research on a duplexer has not only made a great breakthrough in performance but also made a continuous progress in size. The conventional method for obtaining the duplexer is to connect two groups of resonators in parallel at an input port, and couple energy through the resonators, but the remarkable problem is often that the resonators themselves parasitic the influence of the passband to influence the overall performance.
In order to overcome the defects and shortcomings of the prior art, a method for loading short circuit branches by combining two groups of different resonators with coupling lines is provided, and a novel microstrip wide stop band duplexer is designed. The microstrip line is bent at a plurality of positions and reasonably distributed in a two-dimensional space, so that the aim of volume miniaturization is fulfilled.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a microstrip wide stop band duplexer with a compact and reliable structure, which realizes double-frequency characteristics by utilizing a coupling mode of two groups of three-order filters, overcomes harmonic wave and clutter signal interference by utilizing a method of loading an open-circuit branch by parallel coupling lines, and obtains a wider stop band.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the microstrip wide stop band duplexer is manufactured on a double-sided copper-clad dielectric plate in a printed circuit board mode, wherein one side surface of the double-sided copper-clad dielectric plate is a microstrip line layer, and the other side surface of the double-sided copper-clad dielectric plate is a copper-clad ground plate; an input port, a first output port, a second output port, a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator are respectively formed on the microstrip line layer; the input port is connected with a first feeder line and is used for feeding electromagnetic wave signals; the first output port is connected with a second feeder line and is used for feeding out electromagnetic wave signals; the second output port is connected with a third feeder line and is used for feeding out electromagnetic wave signals; the combination of the first output port and the second feeder line and the combination of the second output port and the third feeder line are respectively positioned at two sides of the first feeder line, the second feeder line and the third feeder line are respectively perpendicular to the first feeder line, the first resonator, the second resonator and the third resonator are positioned in a right-angle area formed by the first feeder line and the second feeder line, and the fourth resonator, the fifth resonator and the sixth resonator are positioned in a right-angle area formed by the first feeder line and the third feeder line; the input port and the first feeder line feed a first resonator and a fourth resonator which are positioned at two sides of the first feeder line through a coupling gap, the first resonator is a quarter-wavelength short-circuit resonator formed by a first grounding hole, a first microstrip line and a second microstrip line, the first microstrip line is connected with the second microstrip line, the first grounding hole is arranged at the tail end of the first microstrip line, the fourth resonator is a quarter-wavelength short-circuit resonator formed by a second grounding hole, a third microstrip line and a fourth microstrip line, the third microstrip line is connected with the fourth microstrip line, the second grounding hole is arranged at the tail end of the third microstrip line, and the first grounding hole and the second grounding hole are used for connecting the microstrip line and a grounding plate; the first resonator carries out coupling feed on the second resonator and the third resonator through the first grounding hole, the first resonator and the second resonator are in mirror symmetry relative to the central axis of the third resonator, the second resonator feeds the second feeder through the coupling gap, signals are fed out from the first output port, and signal transmission is completed; the second resonator is a quarter-wavelength short-circuit resonator formed by a first grounding hole, a fifth microstrip line and a sixth microstrip line, the fifth microstrip line is connected with the sixth microstrip line, the first grounding hole is positioned at the tail end of the fifth microstrip line, the third resonator is a quarter-wavelength short-circuit resonator formed by the first grounding hole, a seventh microstrip line and an eighth microstrip line, the seventh microstrip line is connected with the eighth microstrip line, and the first grounding hole is positioned at the tail end of the seventh microstrip line; the fourth resonator is used for carrying out coupling feed on the fifth resonator and the sixth resonator through the second grounding hole, the fourth resonator and the fifth resonator are in mirror symmetry relative to the central axis of the sixth resonator, the fifth resonator is used for feeding the third feeder through the coupling gap, signals are fed out from the second output port, and signal transmission is completed; the fifth resonator is a quarter-wavelength short-circuit resonator formed by a second grounding hole, a ninth microstrip line and a tenth microstrip line, the ninth microstrip line is connected with the tenth microstrip line, the second grounding hole is positioned at the tail end of the ninth microstrip line, the sixth resonator is a quarter-wavelength short-circuit resonator formed by the second grounding hole, the eleventh microstrip line and the twelfth microstrip line, the eleventh microstrip line is connected with the twelfth microstrip line, and the second grounding hole is positioned at the tail end of the eleventh microstrip line.
Further, the first resonator, the second resonator and the third resonator are the same group of resonators and work at 2.5GHz; the fourth resonator, the fifth resonator and the sixth resonator are another group of resonators and work at 2GHz.
Further, the first resonator, the second resonator, the fourth resonator, and the fifth resonator each reduce the size of the resonators by bending.
Further, the third resonator and the sixth resonator are each of a T-shaped structure to reduce the size of the resonators.
Further, the input port, the first output port and the second output port are all 50 ohm matched ports.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention utilizes two sets of resonators to achieve the characteristics of a duplexer and to create a zero near the passband to improve selectivity.
2. The duplexer provided by the invention has smaller harmonic wave and clutter signal interference and wider stop band.
3. The invention has simple design, small volume and low cost, and is applicable to various communication systems.
Drawings
Fig. 1 is a schematic structural diagram of a microstrip wide stop band duplexer according to the present invention.
Fig. 2 is a graph of simulation results of scattering parameters of the microstrip wide stop band duplexer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the microstrip wide stop band duplexer provided in this embodiment is fabricated on a double-sided copper-clad dielectric plate 21 in a printed circuit board manner, wherein one side of the double-sided copper-clad dielectric plate 21 is a microstrip line layer, and the other side thereof is a copper-clad ground plate; an input port 1, a first output port 2, a second output port 3, a first resonator R1, a second resonator R2, a third resonator R3, a fourth resonator R4, a fifth resonator R5, and a sixth resonator R6 are respectively formed on the microstrip line layer; the input port 1, the first output port 2 and the second output port 3 are all 50 ohm matching ports; the first resonator R1, the second resonator R2 and the third resonator R3 are the same group of resonators and work at 2.5GHz, the fourth resonator R4, the fifth resonator R5 and the sixth resonator R6 are the other group of resonators and work at 2GHz, and the two groups of resonators work independently and can be adjusted independently.
The input port 1 is connected with a first feeder line 4 for feeding electromagnetic wave signals; the first output port 2 is connected with a second feeder line 5 for feeding out electromagnetic wave signals; the second output port 3 is connected with a third feeder line 6 for feeding out electromagnetic wave signals; the combination of the first output port 2 and the second feeder line 5 and the combination of the second output port 3 and the third feeder line 6 are respectively positioned at two sides of the first feeder line 4, the second feeder line 5 and the third feeder line 6 are respectively perpendicular to the first feeder line 4, the first resonator R1, the second resonator R2 and the third resonator R3 are positioned in a right-angle area formed by the first feeder line 4 and the second feeder line 5, and the fourth resonator R4, the fifth resonator R5 and the sixth resonator R6 are positioned in a right-angle area formed by the first feeder line 4 and the third feeder line 6; the input port 1 and the first feeder line 4 feed the first resonator R1 and the fourth resonator R4 located at two sides of the first feeder line 4 through a coupling gap, the first resonator R1 is a quarter-wavelength short-circuit resonator formed by a first grounding hole 19, a first microstrip line 7 and a second microstrip line 8, the first microstrip line 7 is connected with the second microstrip line 8, the first grounding hole 19 is placed at the tail end of the first microstrip line 7, the fourth resonator R4 is a quarter-wavelength short-circuit resonator formed by a second grounding hole 20, a third microstrip line 13 and a fourth microstrip line 14, the third microstrip line 13 is connected with the fourth microstrip line 14, the second grounding hole 20 is placed at the tail end of the third microstrip line 13, and the first grounding hole 19 and the second grounding hole 20 are used for connecting the microstrip line and the grounding plate; the first resonator R1 performs coupling feeding on the second resonator R2 and the third resonator R3 through the first grounding hole 19, the first resonator R1 and the second resonator R2 are mirror symmetry with respect to a central axis of the third resonator R3, the second resonator R2 performs feeding on the second feeder 5 through a coupling gap, and a signal is fed out from the first output port 2 to complete signal transmission; the second resonator R2 is a quarter-wavelength short-circuit resonator composed of a first ground hole 19, a fifth microstrip line 10 and a sixth microstrip line 11, the fifth microstrip line 10 is connected to the sixth microstrip line 11, the first ground hole 19 is located at the end of the fifth microstrip line 10, the third resonator R3 is a quarter-wavelength short-circuit resonator composed of a first ground hole 19, a seventh microstrip line 9 and an eighth microstrip line 12, the seventh microstrip line 9 is connected to the eighth microstrip line 12, and the first ground hole 19 is located at the end of the seventh microstrip line 9; the fourth resonator R4 performs coupling feeding on the fifth resonator R5 and the sixth resonator R6 through the second grounding hole 20, the fourth resonator R4 and the fifth resonator R5 are mirror symmetry with respect to the central axis of the sixth resonator R6, the fifth resonator R5 performs feeding on the third feeder 6 through the coupling gap, and signals are fed out from the second output port 3 to complete signal transmission; the fifth resonator R5 is a quarter-wavelength short-circuit resonator composed of a second ground hole 20, a ninth microstrip line 16 and a tenth microstrip line 17, the ninth microstrip line 16 is connected to the tenth microstrip line 17, the second ground hole 20 is located at the end of the ninth microstrip line 16, the sixth resonator R6 is a quarter-wavelength short-circuit resonator composed of a second ground hole 20, an eleventh microstrip line 15 and a twelfth microstrip line 18, the eleventh microstrip line 15 is connected to the twelfth microstrip line 18, and the second ground hole 20 is located at the end of the eleventh microstrip line 15.
The first resonator R1, the second resonator R2, the fourth resonator R4 and the fifth resonator R5 reduce the size of the resonators by bending; the third resonator R3 and the sixth resonator R6 are each of a T-shaped structure to reduce the size of the resonators.
In order to realize a wide stop band, the transmission zero is controlled by adjusting the length of the parallel coupling line on the open circuit branch, and the parasitic passband is suppressed, namely, the coupling length of the first feeder line 4 and the first microstrip line 7 and the length of the second microstrip line 8 are adjusted to adjust the transmission zero; similarly, the coupling length of the second feeder line 5 and the fifth microstrip line 10 is adjusted, and the length of the sixth microstrip line 11 is adjusted to the transmission zero point; adjusting the coupling length of the first feeder line 4 and the third microstrip line 13 and the length of the fourth microstrip line 14 to adjust the transmission zero point; the coupling length of the third feeder line 6 and the ninth microstrip line 16 is adjusted, and the length of the tenth microstrip line 17 is adjusted to the transmission zero point.
The input port 1 feeds the first resonator R1 through a coupling gap with the first feed line 4. Since the first, second and third resonators R1, R2, R3 share the first ground aperture 19, the first resonator R1 couples signals to the second resonator R2 and the third resonator R3 by coupling. The first, second and third resonators R1, R2 and R3 have an operating frequency of 2.5GHz, so that the input signal has a frequency of 2.5GHz, and the electromagnetic wave signal fed in from the input port 1 is transmitted to the second feeder line 5 through the first, second and third resonators R1, R2 and R3 by gap coupling, and thus to the first output port 2. Similarly, the input port 1 feeds the fourth resonator R4 through the coupling gap with the first feeder line 4. Since the fourth, fifth and sixth resonators R4, R5 and R6 share the second ground aperture 20, the fourth resonator R4 couples signals to the fifth resonator R5 and the sixth resonator R6 by coupling. The operating frequency of the fourth, fifth and sixth resonators R4, R5 and R6 is 2GHz, and thus the input signal frequency is 2GHz, and the electromagnetic wave signal fed in by the input port 1 will be transmitted to the third feeder line 6 through the fourth, fifth and sixth resonators R4, R5 and R6 by gap coupling, and thus to the second output port 3. Because the resonator is designed as a method for coupling by sharing a grounding hole, transmission zero points can be generated near the passband, and the selectivity is improved.
Fig. 2 is a graph of simulation results of scattering parameters of the microstrip wide stop band duplexer. The horizontal axis represents the signal frequency of the microstrip wide stop band duplexer, the vertical axis represents the amplitude, and the insertion loss S is included 21 Amplitude and insertion loss S of (2) 31 Amplitude of S 21 The relation between the input signal frequency and the output signal frequency of the microstrip wide stop band duplexer is shown, the input end is an input port 1, the output end is a first output port 2, and the corresponding mathematical function is as follows: output power/input power (dB) =20×log|s 21 | a. The invention relates to a method for producing a fibre-reinforced plastic composite. Similarly, S 31 The relation between the input signal frequency and the output signal frequency of the microstrip wide stop band duplexer is shown, and the input end is an input endThe input port 1 and the output end are the second output port 3, and the corresponding mathematical functions are as follows: output power/input power (dB) =20×log|s 31 | a. The invention relates to a method for producing a fibre-reinforced plastic composite. As can be seen from the figure, when a signal is input from the input port 1, only a signal having a center frequency of 2.50 GHz can be output from the first output port 2, and the insertion loss in the passband is small; when a signal is input from the input port 1, only a signal having a center frequency of 2GHz can be output from the second output port 3, and insertion loss within the passband is small. In the stopband, the insertion loss is reduced to below 20dB in the range of less than 9GHz, which shows that the microstrip wide stopband duplexer has high clutter filtering capability and low interference degree on the transmitted signals.
In summary, the microstrip wide stop band duplexer of the present invention is composed of two sets of resonators, and each passband characteristic is independently adjustable. The transmission zero is introduced by combining parallel coupling lines and short circuit branches to inhibit higher harmonics, so that a wider stop band is obtained. Therefore, the invention has the advantages of simple and compact structure, small volume, low double-band passband loss, high selectivity, high bandwidth resistance, high inhibition degree and the like, and is worthy of popularization.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (3)
1. The microstrip wide stop band duplexer is manufactured on a double-sided copper-clad dielectric plate in a printed circuit board mode, wherein one side surface of the double-sided copper-clad dielectric plate is a microstrip line layer, and the other side surface of the double-sided copper-clad dielectric plate is a copper-clad ground plate; the method is characterized in that: an input port, a first output port, a second output port, a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator are respectively formed on the microstrip line layer; the input port is connected with a first feeder line and is used for feeding electromagnetic wave signals; the first output port is connected with a second feeder line and is used for feeding out electromagnetic wave signals; the second output port is connected with a third feeder line and is used for feeding out electromagnetic wave signals; the combination of the first output port and the second feeder line and the combination of the second output port and the third feeder line are respectively positioned at two sides of the first feeder line, the second feeder line and the third feeder line are respectively perpendicular to the first feeder line, the first resonator, the second resonator and the third resonator are positioned in a right-angle area formed by the first feeder line and the second feeder line, and the fourth resonator, the fifth resonator and the sixth resonator are positioned in a right-angle area formed by the first feeder line and the third feeder line; the input port and the first feeder line feed a first resonator and a fourth resonator which are positioned at two sides of the first feeder line through a coupling gap, the first resonator is a quarter-wavelength short-circuit resonator formed by a first grounding hole, a first microstrip line and a second microstrip line, the first microstrip line is connected with the second microstrip line, the first grounding hole is arranged at the tail end of the first microstrip line, the fourth resonator is a quarter-wavelength short-circuit resonator formed by a second grounding hole, a third microstrip line and a fourth microstrip line, the third microstrip line is connected with the fourth microstrip line, the second grounding hole is arranged at the tail end of the third microstrip line, and the first grounding hole and the second grounding hole are used for connecting the microstrip line and a grounding plate; the first resonator carries out coupling feed on the second resonator and the third resonator through the first grounding hole, the first resonator and the second resonator are in mirror symmetry relative to the central axis of the third resonator, the second resonator feeds the second feeder through the coupling gap, signals are fed out from the first output port, and signal transmission is completed; the second resonator is a quarter-wavelength short-circuit resonator formed by a first grounding hole, a fifth microstrip line and a sixth microstrip line, the fifth microstrip line is connected with the sixth microstrip line, the first grounding hole is positioned at the tail end of the fifth microstrip line, the third resonator is a quarter-wavelength short-circuit resonator formed by the first grounding hole, a seventh microstrip line and an eighth microstrip line, the seventh microstrip line is connected with the eighth microstrip line, and the first grounding hole is positioned at the tail end of the seventh microstrip line; the fourth resonator is used for carrying out coupling feed on the fifth resonator and the sixth resonator through the second grounding hole, the fourth resonator and the fifth resonator are in mirror symmetry relative to the central axis of the sixth resonator, the fifth resonator is used for feeding the third feeder through the coupling gap, signals are fed out from the second output port, and signal transmission is completed; the fifth resonator is a quarter-wavelength short-circuit resonator formed by a second grounding hole, a ninth microstrip line and a tenth microstrip line, the ninth microstrip line is connected with the tenth microstrip line, the second grounding hole is positioned at the tail end of the ninth microstrip line, the sixth resonator is a quarter-wavelength short-circuit resonator formed by the second grounding hole, the eleventh microstrip line and the twelfth microstrip line, the eleventh microstrip line is connected with the twelfth microstrip line, and the second grounding hole is positioned at the tail end of the eleventh microstrip line; the first resonator, the second resonator and the third resonator are the same group of resonators and work at 2.5GHz; the fourth resonator, the fifth resonator and the sixth resonator are another group of resonators and work at 2GHz; the third resonator and the sixth resonator are each of T-shaped configuration to reduce the size of the resonators.
2. The microstrip wide stop band diplexer of claim 1, wherein: the first resonator, the second resonator, the fourth resonator, and the fifth resonator each reduce the size of the resonators by bending.
3. The microstrip wide stop band diplexer of claim 1, wherein: the input port, the first output port and the second output port are all 50 ohm matched ports.
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| CN201910128836.2A CN109713410B (en) | 2019-02-21 | 2019-02-21 | Microstrip wide stop band duplexer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023866A (en) * | 1987-02-27 | 1991-06-11 | Motorola, Inc. | Duplexer filter having harmonic rejection to control flyback |
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN108448212A (en) * | 2018-01-11 | 2018-08-24 | 华南理工大学 | A kind of duplexing filtered switch based on coupling control |
-
2019
- 2019-02-21 CN CN201910128836.2A patent/CN109713410B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023866A (en) * | 1987-02-27 | 1991-06-11 | Motorola, Inc. | Duplexer filter having harmonic rejection to control flyback |
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN108448212A (en) * | 2018-01-11 | 2018-08-24 | 华南理工大学 | A kind of duplexing filtered switch based on coupling control |
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