CN114649656B - Dual-passband filtering phase shifter - Google Patents
Dual-passband filtering phase shifter Download PDFInfo
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- CN114649656B CN114649656B CN202210462343.4A CN202210462343A CN114649656B CN 114649656 B CN114649656 B CN 114649656B CN 202210462343 A CN202210462343 A CN 202210462343A CN 114649656 B CN114649656 B CN 114649656B
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
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- H01P1/184—Strip line phase-shifters
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Abstract
The invention discloses a dual-passband filtering phase shifter, which belongs to the technical field of wireless mobile communication and comprises a main channel structure and a reference channel structure; the reference path structure comprises a metal grounding plate, a dielectric substrate and a reference path, wherein the reference path comprises four sequentially connected coupling lines with short-circuited terminals and three open-circuit branches respectively positioned at the connection positions of the adjacent coupling lines, and is plane-symmetrical about the middle open-circuit branch; the main channel structure comprises a metal grounding plate, a dielectric substrate and a main channel, wherein the main channel comprises a structure same as the reference channel and a Schiffman phase shift unit cascaded with one end of the structure. The filter phase shifter adjusts the filtering performance and the phase shifting performance of the filter phase shifter by changing the impedance value and the electrical length of the odd-even mode of each coupling line and the Schiffman phase shifting unit and the impedance value and the electrical length of each open-circuit branch, particularly can adjust the dual-passband filter response type, and realizes the complete independence of the dual-passband of the filter phase shifter.
Description
Technical Field
The invention belongs to the technical field of wireless mobile communication, and particularly relates to a dual-passband filtering phase shifter.
Background
With the rapid development of wireless communication technology, multifunctional and highly integrated devices rise rapidly, and various filters are integrated with couplers, power dividers, antennas or other passive devices, so that the filter has the characteristics of high frequency selectivity, low insertion loss, small size and the like, and has attracted extensive research interest. The filtering phase shifter integrates the filtering characteristic and the phase shifting characteristic, has the characteristic of miniaturization, and has strong application value in systems such as an antenna feed network, a phased array antenna and the like.
In recent years, with the rapid development of the wireless electronic industry in China, the number of wireless communication services is rapidly increased, and multifunctional devices such as multiband/broadband operation and the like are widely concerned in the current microwave communication system. The dual-frequency filtering phase shifter can work in different frequency bands of a 5G communication system so as to reduce cost and size, and can be applied to various dual-frequency devices such as a dual-frequency Doherty power amplifier, a dual-frequency dual-loop antenna, a dual-frequency radar and the like. However, the research on the dual-frequency filtering phase shifter is relatively few, and there are some problems, such as difficulty in obtaining completely independent dual-pass bands and difficulty in determining circuit parameters through theoretical analysis.
Disclosure of Invention
The present invention is directed to solve the above problems in the prior art, and an object of the present invention is to provide a dual-passband filter phase shifter, which can achieve the purpose of arbitrarily setting the filter response type, the operating bandwidth, the center frequency, and the phase shift value of a dual-passband by adjusting the impedance value and the electrical length of an element, and implement a dual-passband completely independent filter phase shifter.
The technical scheme adopted by the invention is as follows:
a dual-passband filtering phase shifter is characterized by comprising a main channel structure and a reference channel structure;
the reference path structure comprises a metal grounding plate, a dielectric substrate and a reference path which are sequentially arranged from bottom to top, the reference path comprises four sequentially connected coupling lines with short-circuited terminals and three open-circuit branches respectively positioned at the connection positions of the adjacent coupling lines, and the reference path structure is plane-symmetrical about the middle open-circuit branch;
the main path structure comprises a metal grounding plate, a dielectric substrate and a main path which are sequentially arranged from bottom to top, and the main path comprises a structure same as the reference path and a Schiffman (Schiffman) phase shift unit cascaded with one end of the structure.
Furthermore, the coupling line is provided with a metalized through hole connected with the metal grounding plate at one end, so that the terminal short circuit is realized.
Furthermore, the main path structure and the reference path structure both adopt microstrip structures.
Further, although the main path includes the same structure as the reference path, the impedance value and the electrical length of the odd-even mode of the coupling line, and the impedance value and the electrical length of the open stub are different from those of the reference path.
Furthermore, the four coupling lines with short-circuited terminals connected in sequence in the reference path are respectively a first coupling line, a second coupling line, a third coupling line and a fourth coupling line, the odd-even mode impedance value and the electrical length of the first coupling line and the fourth coupling line are equal, the odd-even mode impedance value and the electrical length of the second coupling line and the third coupling line are equal, and the odd-even mode impedance ratio of the first coupling line is greater than that of the second coupling line. Therefore, the line width of the first coupling line is wide, and the distance is small; and the line width of the second coupling line is narrower, and the distance is larger.
Further, as the dual-passband center frequency ratio n of the dual-passband filtering phase shifter increases, the electrical length of the second coupling line shows a decreasing trend, and when n is greater than 3.1, the electrical length is less than 0, and the structure cannot be realized. The dual-passband center frequency ratio n of the dual-passband filtered phase shifter is therefore less than 3.1.
Furthermore, three open-circuit branches in the reference path, which are respectively located at the connection position of adjacent coupling lines, are a first open-circuit branch, a second open-circuit branch and a third open-circuit branch in sequence, the impedance value and the electrical length of the first open-circuit branch and the third open-circuit branch are equal, and the impedance value and the electrical length of the second open-circuit branch are greater than those of the first open-circuit branch. Therefore, the second open-circuit branch has narrow line width and long length; the first open-circuit branch has a wider line width and a shorter length.
Further, the filtering performances of the dual-passband filtering phase shifter, such as dual-passband bandwidth, dual-passband center frequency and the like, are adjusted by changing the impedance value and the electrical length of the odd-even mode of the coupling line and the impedance value and the electrical length of the open-circuit branch.
Further, by changing the impedance ratio and the electrical length of the odd-even mode of the Schiffman phase shift unit, the phase shift performance such as the phase shift value and the phase imbalance degree of the dual-passband is adjusted, and the reference formula is as follows:
wherein, the first and the second end of the pipe are connected with each other,
and
respectively representing phase shift values of double pass bands; rho 0 For the odd-even mode impedance ratio of the Schiffman phase shift unit,
wherein Z is 0e ，Z 0o Respectively an even mode impedance value and an odd mode impedance value; theta d Is the electrical length of the Schiffman phase shift unit; n is the dual passband center frequency ratio.
Furthermore, the Schiffman phase shift unit is cascaded with the first coupling line in the main path, which has the same structure as the reference path, and at this time, the input signal is input from the first coupling line of the reference path and the Schiffman phase shift unit of the main path and is output from the fourth coupling line of the reference path and the main path.
The invention has the beneficial effects that:
the invention provides a dual-passband filtering phase shifter, which adopts a filtering unit with a specific structure as a reference channel, and a Schiffman phase shifting unit is cascaded at one end with the same structure as the reference channel to form a main channel, and the filtering performance and the phase shifting performance of the dual-passband filtering phase shifter are adjusted by changing the impedance value and the electrical length of a coupling line with short circuit at each terminal and an odd-even mode impedance value and the electrical length of the Schiffman phase shifting unit, and the impedance value and the electrical length of each open-circuit branch, particularly the type of the dual-passband filtering response, so that the dual-passband of the filtering phase shifter is completely independent.
Drawings
Fig. 1 is a schematic structural diagram of a dual-passband filtering phase shifter according to embodiment 1 of the present invention; wherein (a) is a reference via structure; (b) a main channel structure;
fig. 2 is a diagram of theoretical simulation results of S parameters and phase shift values of four dual-passband filtering phase shifters provided in embodiment 1 of the present invention; wherein (a) is butterworth/0.2 dB chebyshev type; (b) is 0.2dB Chebyshev/0.01 dB Chebyshev type; (c) is of the butterworth/butterworth type; (d) is 0.1dB chebyshev/butterworth;
fig. 3 is a diagram of an actual simulation result of S parameters of two ports P1 and P2 of a reference channel in the butterworth/0.2 dB chebyshev-type dual-passband filter phase shifter provided in embodiment 1 of the present invention;
fig. 4 is a diagram of an actual simulation result of S parameters of two ports P3 and P4 of a main path in the butterworth/0.2 dB chebyshev-type dual-bandpass filter phase shifter according to embodiment 1 of the present invention;
FIG. 5 is a diagram of a result of an actual simulation of the phase shift response of the Butterworth/0.2 dB Chebyshev-type dual-bandpass filter phase shifter provided in embodiment 1 of the present invention;
the reference symbols in the drawings are as follows:
1: a first coupled line of a reference path; 2: a second coupled line of the reference path; 3: a third coupled line of the reference path; 4: a fourth coupled line of the reference path; 5: a first open circuit branch of the reference path; 6: a second open branch of the reference path; 7: a third open path stub of the reference path; 8 to 12: a metallized via of the reference via; 13: a Schiffman phase shift unit; 14: a first coupled line of the main path; 15: a second coupled line of the main path; 16: a third coupled line of the main path; 17: a fourth coupled line of the main path; 18: a first open circuit stub of the main path; 19: a second open circuit stub of the main path; 20: a third branch of the main passage; 21 to 25: a metallized via of the main via; 26: a reference path; 27: a dielectric substrate of a reference via structure; 28: a metal ground plate of the reference via structure; 29: a main path; 30: a dielectric substrate of a main via structure; 31: a metal ground plate of the main via structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
This embodiment provides a dual-passband filter phase shifter comprising a reference path structure and a main path structure, the structures being shown in fig. 1 (a) and (b), respectively.
The reference channel structure comprises a metal grounding plate 28, a dielectric substrate 27 and a reference channel 26 which are arranged from bottom to top in sequence; the reference path 26 is of a microstrip structure and comprises a first coupling line 1, a second coupling line 2, a third coupling line 3 and a fourth coupling line 4 which are connected in sequence and are short-circuited at terminals, and a first open-circuit branch 5, a second open-circuit branch 6 and a third open-circuit branch 7 which are respectively positioned at the connection positions of adjacent coupling lines; the reference path 26 is plane-symmetric with respect to the second open stub 6. Each coupled line in the reference path 26 is short-circuited at the terminals by means of the metallized through holes 8-12 connected to the metal ground plate. The P1 port of the reference path 26 connected to the first coupled line 1 is an input port, and the P3 port connected to the fourth coupled line 4 is an output port.
The main channel structure comprises a metal grounding plate 31, a dielectric substrate 30 and a main channel 29 which are arranged from bottom to top in sequence; the main path 29 is of a microstrip structure and comprises a Schiffman phase shift unit 13, a first coupling line 14, a second coupling line 15, a third coupling line 16 and a fourth coupling line 17 which are connected in sequence and are short-circuited at the terminals, and a first open-circuit branch 18, a second open-circuit branch 19 and a third open-circuit branch 20 which are respectively positioned at the connection positions of adjacent coupling lines; the Schiffman phase shift unit 13 is cascaded with the first coupled line 14, and the structure of the main via 29 excluding the Schiffman phase shift unit 13 is plane-symmetric with respect to the second open stub 19. Each coupled line in the main via 29 is short-circuited to the terminal by means of the metallized through holes 21-25 connected to the metal ground plane. The P2 port of the main path 29 connected to the Schiffman phase shift unit 13 is an input port, and the P4 port connected to the fourth coupled line 17 is an output port.
The dielectric substrate 27 of the reference via structure and the dielectric substrate 30 of the main via structure both have a relative dielectric constant of 3.55 and a thickness of 1.524mm.
In the present embodiment, the first coupling line 1 and the fourth coupling line 4 of the reference path 26 have the same odd-even mode impedance value and electrical length, the second coupling line 2 and the third coupling line 3 have the same odd-even mode impedance value and electrical length, the first open branch 5 and the third open branch 7 have the same impedance value and electrical length, the odd-even mode impedance value of the first coupling line 1 is smaller than that of the second coupling line 2, and the odd-even mode impedance ratio of the first coupling line 1 is larger than that of the second coupling line 2.
Similarly, the first coupling line 14 and the fourth coupling line 17 of the main path 29 have the same parity-mode impedance value and electrical length, the second coupling line 15 and the third coupling line 16 have the same parity-mode impedance value and electrical length, the first open-circuit branch 18 and the third open-circuit branch 20 have the same impedance value and electrical length, the first coupling line 14 has a smaller parity-mode impedance value than the second coupling line 15, and the first coupling line 14 has a larger parity-mode impedance ratio than the second coupling line 15.
In this embodiment, by adjusting the odd-even mode impedance value and the electrical length of each coupling line, and the impedance value and the electrical length of the open-branch node, theoretical simulation realizes four types of dual-passband filter phase shifters, and the simulation results are shown in fig. 2 and table 1, which are the butterworth/0.2 dB chebyshev types of fig. 2 (a) and table 1 (a), the 0.2dB chebyshev/0.01 dB chebyshev types of fig. 2 (b) and table 1 (b), the butterworth/butterworth types of fig. 2 (c) and table 1 (c), and the 0.1dB chebyshev/butterworth types of fig. 2 (d) and table 1 (d), respectively, and the corresponding types of dual-passband filter response, dual-passband center frequency, dual-passband bandwidth, and dual-passband phase shift values are shown in table 2. It can be seen that the dual-passband filtering phase shifter can flexibly adjust the performance of dual-passband such as filtering response, working bandwidth, center frequency and phase shift value, and has the characteristic of complete independence of dual-passband.
TABLE 1 parameters of the elements of the reference path 26 and the main path 29 of four different types of dual band-pass filter phase shifters
(a) Butterworth/0.2 dB Chebyshev type
(b) 0.2dB Chebyshev/0.01 dB Chebyshev model
(c) Butterworth/Butterworth types
(d) 0.1dB Chebyshev/Butterworth type
TABLE 2 Performance parameters of four different types of dual bandpass filtered phase shifters
In this embodiment, a butterworth/0.2 dB chebyshev-type dual-passband filter phase shifter is taken as an example, and is actually simulated, the central operating frequencies of the dual-passband filter phase shifter are set to be 2GHz and 5GHz, the operating bandwidths are set to be 200MHz and 150MHz, and the phase shift values are set to be 90 ° and 270 °.
Signals are respectively input from the P1 and P3 feeding ports and output from the P2 and P4 ports, and an S parameter actual simulation result chart of the two ports P1 and P2 of the reference path shown in FIG. 3, an S parameter actual simulation result chart of the two ports P3 and P4 of the main path shown in FIG. 4 and a phase shift response actual simulation result chart shown in FIG. 5 are obtained. As can be seen, S of the main channel 29 and the reference channel 26 11 The frequency ranges of 1.9 to 2.06GHz and 4.95 to 5.1GHz are both lower than-10 dB, and the working frequency ranges of 90 degrees +/-5 degrees and 270 degrees +/-5 degrees of phase shift values are 1.76 to 2.05GHz and 4.95 to 5.08GHz respectively. By integrating the filtering performance and the phase shifting performance, the operating frequency ranges of the butterworth/0.2 dB chebyshev-type dual-passband filtering phase shifter provided by the embodiment are 1.91-2.05 GHz and 4.95-5.08 GHz respectively, and the performance of the dual-passband completely independent filtering phase shifter can be realized.
The above-mentioned embodiment is only one embodiment of the present invention, and the description is specific, but it should not be taken as limiting the scope of the invention. It should be noted that, for those skilled in the art, it is possible to make various changes and modifications to the present invention without departing from the gist of the present invention, and these changes and modifications are still within the scope of the present invention. Therefore, the specific protection scope of the present application shall be subject to the appended claims.
Claims (3)
1. A dual-passband filtering phase shifter is characterized by comprising a main channel structure and a reference channel structure;
the reference passage structure comprises a metal grounding plate, a dielectric substrate and a reference passage which are arranged from bottom to top in sequence;
the reference path comprises a first coupling line, a second coupling line, a third coupling line and a fourth coupling line, wherein one end of the first coupling line is provided with a metalized through hole connected with a metal grounding plate to realize terminal short circuit, the odd-even mode impedance value and the electrical length of the first coupling line and the fourth coupling line are equal, the odd-even mode impedance value and the electrical length of the second coupling line and the third coupling line are equal, and the odd-even mode impedance ratio of the first coupling line is greater than that of the second coupling line;
the first coupling line is formed by coupling a first microstrip line and a second microstrip line, the second coupling line is formed by coupling a third microstrip line and a fourth microstrip line, the third coupling line is formed by coupling a fifth microstrip line and a sixth microstrip line, and the fourth coupling line is formed by coupling a seventh microstrip line and an eighth microstrip line; the input port, the first microstrip line, the third microstrip line, the fifth microstrip line, the seventh microstrip line and the output port are sequentially connected, and the second microstrip line, the fourth microstrip line, the sixth microstrip line and the eighth microstrip line are sequentially connected;
the reference passage also comprises a first open-circuit branch knot, a second open-circuit branch knot and a third open-circuit branch knot which are distributed in a staggered manner; the first open-circuit branch is located at the joint of the second microstrip line and the fourth microstrip line, the second open-circuit branch is located at the joint of the third microstrip line and the fifth microstrip line, and the third open-circuit branch is located at the joint of the sixth microstrip line and the eighth microstrip line; the impedance value and the electrical length of the first open-circuit branch and the third open-circuit branch are equal, and the impedance value and the electrical length of the second open-circuit branch are greater than those of the first open-circuit branch;
the main path structure comprises a metal grounding plate, a dielectric substrate and a main path which are sequentially arranged from bottom to top, the main path comprises a structure same as that of the reference path, and a Schiffman phase shift unit cascaded between the input port and the first microstrip line;
the dual-passband filtering response, the dual-passband bandwidth or the dual-passband center frequency of the dual-passband filtering phase shifter are adjusted by changing the impedance value and the electrical length of the odd-even mode of the coupling line and the impedance value and the electrical length of the open-circuit branch.
2. Double passband filter phase shifter as claimed in claim 1, wherein the double passband centre frequency ratio of the double passband filter phase shifternLess than 3.1.
3. The dual-bandpass filter phase shifter according to claim 1, wherein the phase shift value or the phase imbalance of the dual-bandpass is adjusted by changing the impedance ratio of the odd-even mode and the electrical length of the Schiffman phase shift unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977585A (en) * | 2016-06-22 | 2016-09-28 | 东北大学 | Parallel coupling line and open-circuit stub based differential filter |
| CN112332054A (en) * | 2020-11-18 | 2021-02-05 | 辽宁工程技术大学 | Dual-passband band-pass filter based on asymmetric coupling line |
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| KR100538822B1 (en) * | 2003-05-27 | 2005-12-23 | 한국전자통신연구원 | Broadband Phase Shifter Using a Coupled Line and Parallel Open/Short Stubs |
| CN102522616B (en) * | 2012-01-03 | 2014-06-18 | 西安电子科技大学 | Micro-band dual-mode band-pass filter based on double-end short-circuit resonator |
| CN103956544A (en) * | 2014-03-05 | 2014-07-30 | 上海海事大学 | Ultra-wide band (UWB) filter based on folding branch loading multi-mode resonator |
| CN112864549B (en) * | 2021-01-07 | 2021-10-19 | 南京邮电大学 | Novel miniaturized differential phase shifter of multichannel broadband |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977585A (en) * | 2016-06-22 | 2016-09-28 | 东北大学 | Parallel coupling line and open-circuit stub based differential filter |
| CN112332054A (en) * | 2020-11-18 | 2021-02-05 | 辽宁工程技术大学 | Dual-passband band-pass filter based on asymmetric coupling line |
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