CN117219987A - Balance type broadband filtering phase shifter - Google Patents
Balance type broadband filtering phase shifter Download PDFInfo
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- CN117219987A CN117219987A CN202311331626.6A CN202311331626A CN117219987A CN 117219987 A CN117219987 A CN 117219987A CN 202311331626 A CN202311331626 A CN 202311331626A CN 117219987 A CN117219987 A CN 117219987A
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- 238000001914 filtration Methods 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims abstract description 28
- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000004044 response Effects 0.000 claims description 6
- 230000010363 phase shift Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000001629 suppression Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
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- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Abstract
The invention discloses a balanced broadband filtering phase shifter which comprises a reference line and a main line, wherein the reference line and the main line are identical in structure and comprise first to fourth feeder lines, a first half-wavelength microstrip line, a second half-wavelength microstrip line, third to eighth microstrip lines, a coupling microstrip line and a capacitor. The existing filter phase shifter is mainly of a single-ended structure and weak in common-mode interference resistance. The existing balanced filter phase shifter has the problems of narrow bandwidth or poor frequency selectivity. The invention realizes the balanced broadband filtering phase shifter with broadband differential mode phase shifting, high frequency selectivity and broadband common mode suppression simultaneously by loading the microstrip line and the coupling line short circuit branch in the transmission structure of the capacitor cascade microstrip line.
Description
Technical Field
The present invention relates to a microwave communication device, and more particularly, to a phase shifter.
Background
With the development of wireless technology, there is a higher demand for broadband, miniaturization, and integration of wireless communication systems. The filter and the phase shifter are used as key devices of the phased array, and have a frequency selection function and a phase regulation function respectively. The broadband filter phase shifter is formed by integrating the broadband filter and the broadband phase shifter, so that the size, complexity and loss of the whole circuit can be reduced, and the integration level of the system can be improved. Compared with single-ended design, the balanced broadband filtering phase shifter not only has broadband filtering function and broadband phase shifting function, but also has good common mode signal suppression capability, and can solve the problems of environmental noise, electromagnetic crosstalk and the like in a system. Therefore, the balanced wideband filtering phase shifter with wideband, high frequency selectivity and high common mode rejection accords with the development trend of the current wireless communication system. However, the design of balanced wideband filter phase shifters still faces significant challenges.
At present, most of reported filter phase shifters are single-ended designs, mainly adopt methods of multi-branch loading T-shaped transmission lines, multi-mode resonators, broadside coupling, coupling line terminal loading open-circuit branches and the like, but have no common mode rejection capability, and are not beneficial to relieving the problems of environmental noise, electromagnetic crosstalk and the like in a system. The existing balanced filtering phase shifter is realized by utilizing structures such as a multimode T-shaped resonator, a three-terminal folding coupling line cascade microstrip line and the like, and the existing design has the defects of narrow working bandwidth or poor frequency selectivity and the like. Therefore, it is important to design a balanced wideband filter phase shifter to further increase the operating bandwidth and improve the frequency selectivity and the common mode rejection capability.
Disclosure of Invention
The invention aims to: aiming at the prior art, a balanced broadband filtering phase shifter is provided to solve the problems of narrow working bandwidth and poor frequency selectivity, and has better common mode rejection capability, simple structure and easy processing.
The technical scheme is as follows: the balanced broadband filtering phase shifter comprises a reference line and a main line, wherein the reference line and the main line are consistent in structure and comprise first to fourth feeder lines, a first half-wavelength microstrip line, a second half-wavelength microstrip line, third to eighth microstrip lines, a coupling microstrip line and a capacitor;
wherein the first feeder line and the second feeder line correspond to a pair of balanced input ports, and the third feeder line and the fourth feeder line correspond to a pair of balanced output ports; the two ends of the first half-wavelength microstrip line are correspondingly connected with a first feeder line and a second feeder line respectively, and the two ends of the second half-wavelength microstrip line are correspondingly connected with a third feeder line and a fourth feeder line respectively;
the third microstrip line and the seventh microstrip line are connected in series, one end of the fifth microstrip line is connected to the connection part of the third microstrip line and the seventh microstrip line, and the other end of the fifth microstrip line is grounded; the fourth microstrip line and the eighth microstrip line are connected in series, one end of the sixth microstrip line is connected to the connection position of the fourth microstrip line and the eighth microstrip line, and the other end of the sixth microstrip line is grounded;
the capacitor is connected between two ports on one side of the coupling microstrip line, and the two ports are correspondingly connected with one end of the seventh microstrip line and one end of the eighth microstrip line respectively; two ports on the other side of the coupling microstrip line are grounded;
the physical dimensions of the third microstrip line and the fourth microstrip line in the main line structure are different from those of the third microstrip line and the fourth microstrip line in the reference line structure, and the phase difference generated by the physical dimensions is used as a phase shift reference value of the phase shifter.
The beneficial effects are that: the existing filter phase shifter is mainly of a single-ended structure and weak in common-mode interference resistance. The existing balanced filter phase shifter has the problems of narrow bandwidth or poor frequency selectivity. The invention realizes the balanced broadband filtering phase shifter with broadband differential mode phase shifting, high frequency selectivity and broadband common mode suppression simultaneously by loading the microstrip line and the coupling line short circuit branch in the transmission structure of the capacitor cascade microstrip line.
Specifically, the capacitor and the coupling microstrip line are respectively used for regulating and controlling the movement of the left transmission zero point and the right transmission zero point of the differential mode transmission response to the center frequency, so that the design has higher frequency selectivity. The loaded microstrip lines 9, 10, as well as the capacitive and coupling microstrip lines, can be used to generate both differential mode transmission poles and common mode transmission zeros, enabling the phase shifter to have wideband differential mode impedance matching and wideband common mode rejection properties.
Drawings
FIG. 1 is a circuit diagram of a balanced wideband filter phase shifter;
FIG. 2 is a simulation result of the differential mode S parameter of the balanced wideband filter phase shifter of the present invention;
FIG. 3 is a simulation result of common mode S parameters of the balanced wideband filter phase shifter of the present invention;
fig. 4 shows the result of a differential mode shift simulation of the balanced wideband filter phase shifter of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in fig. 1, the balanced broadband filtering phase shifter comprises a reference line and a main line, wherein the reference line and the main line have the same structure and each comprise feeder lines 1-4, half-wavelength microstrip lines 5 and 6, microstrip lines 7-12, a coupling microstrip line 13 and a capacitor 14. The two ends of the wavelength microstrip line 5 are respectively and correspondingly connected with the feeder line 1 and the feeder line 2, and the two ends of the half-wavelength microstrip line 6 are respectively and correspondingly connected with the feeder line 3 and the feeder line 4. The microstrip line 7 and the microstrip line 11 are connected in series, one end of the microstrip line 9 is connected to the connection part of the microstrip line 7 and the microstrip line 11, and the other end is grounded. The microstrip line 8 and the microstrip line 12 are connected in series, one end of the microstrip line 10 is connected to the connection part of the microstrip line 8 and the microstrip line 12, and the other end is grounded. The two ports on the lower side of the coupling microstrip line 13 are grounded, and the two ends on the upper side are respectively connected with the two ends of the capacitor 14. The left and right connection points formed by the coupling microstrip line 13 and the capacitor 14 are respectively connected with the microstrip line 11 and the microstrip line 12, i.e. two ports on the upper side of the coupling microstrip line 13 are respectively correspondingly connected with one end of the microstrip line 11 and one end of the microstrip line 12. The overall structure of the main line and the reference line are symmetrical along the longitudinal center line.
In the present invention, the circuit structures of the reference line and the main line of the phase shifter are the same as shown in fig. 1, and the difference is that the physical size values of the corresponding parts are different. The microstrip line 7 and the microstrip line 8 have a phase delay function, that is, the phase difference generated by the microstrip line 7 and the microstrip line 8 in the main line structure and the microstrip line 7 and the microstrip line 8 in the reference line structure is used as a phase shift reference value of the phase shifter. The capacitance of the capacitor 14 and the impedance of the microstrip lines 9-13 are used for regulating and controlling the phase slope, so as to form broadband differential mode phase shift.
When the phase shifter is excited by a differential mode signal, a transmission zero point is generated on the left side of the differential mode transmission response of the invention under the combined action of the capacitor 14 and the coupling microstrip line 13, and two transmission zero points are generated on the right side. The transmission zero on the left is mainly regulated by the capacitor 14, and when the capacitance decreases, the transmission zero moves to high frequency. The two transmission zeroes on the right side are mainly controlled by the electric length of the coupling microstrip line 13, and when the electric length is increased, the transmission zeroes move to low frequency. In addition, under the action of the microstrip line 9 and the microstrip line 10, a transmission zero point can be generated on the right side of the differential mode transmission response, and the transmission zero point moves to a low frequency when the electrical lengths of the microstrip line 9 and the microstrip line 10 are increased. In adjusting the transmission zero, little effect is exerted on the 3-dB bandwidth. Therefore, by adjusting the electric length of the coupling microstrip line 13, the capacitance of the capacitor 14 and the electric lengths of the microstrip lines 9 and 10, the transmission zeros on the left and right sides can be made to approach the center frequency, and the frequency selectivity can be improved. Meanwhile, the microstrip line 9, the microstrip line 10, the capacitor 14 and the coupling microstrip line 13 can also generate differential mode transmission poles, and the differential mode impedance matching is improved by adjusting the impedance of the microstrip lines 9 to 12 and the coupling microstrip line 13. Thus, broadband differential mode impedance matching is obtained while improving frequency selectivity.
When the phase shifter is excited by the common mode signal, the phase of the signal entering from the feeder line 2 of the balanced port is changed by 180 degrees through the half-wavelength transmission line 5, and the signal entering from the feeder line 1 of the balanced port is mutually counteracted, so that the suppression of the common mode signal is realized. In addition, the coupling microstrip line 13, the microstrip line 9 and the microstrip line 10 can obtain a plurality of common mode transmission zeros through the capacitor 14, and the degree of common mode signal suppression is improved by adjusting the impedance of the microstrip lines 9 to 12 and the coupling microstrip line 13, so that broadband common mode suppression is realized.
Compared with the existing balanced filtering phase shifter, the invention improves the frequency selectivity while obtaining the broadband differential mode working bandwidth, and has the advantages of broadband common mode rejection, simple structure, easy processing and the like.
The following is a 45 ° and 90 ° design case of the present invention, and a schematic circuit structure thereof is shown in fig. 1. The case of the balanced broadband filtering phase shifter adopts an RO4003C substrate, wherein the dielectric constant is 3.38, the loss angle is 0.0027, the thickness is 0.813mm, and the center frequency is 1GHz. The differential mode S parameter, the common mode S parameter, and the differential mode shift response are shown in fig. 2 to 4. As can be derived from fig. 2 and 3, for the reference line, the 10-dB differential mode impedance match relative bandwidth is 77%, the 3-dB relative bandwidth is 73%, the minimum insertion loss is 0.56dB, and the 13-dB common mode rejection relative bandwidth is 210%; for a 45 DEG phase shifter main line, the relative bandwidth of 10-dB differential mode impedance matching is 78%, the relative bandwidth of 3-dB is 74%, the minimum insertion loss is 0.68dB, and the relative bandwidth of 13-dB common mode rejection is 220%; for a 90 DEG phase shifter main line, the 10-dB differential mode impedance matching relative bandwidth is 80%, the 3-dB relative bandwidth is 75%, the minimum insertion loss is 0.64dB, and the 13-dB common mode rejection relative bandwidth is 180%. As can be seen from fig. 4, the differential mode phase shift bandwidth to achieve 45 ° ± 3 ° (90 ° ± 5 °) is 73% (74%). Thus, for the 45 ° and 90 ° phase shifters, their operating bandwidths are 73% and 72%, respectively. It can be seen that the common mode rejection bandwidth of the present invention can fully cover the differential mode operating passband.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The balanced broadband filtering phase shifter is characterized by comprising a reference line and a main line, wherein the reference line and the main line are identical in structure and comprise first to fourth feeder lines (1-4), a first half-wavelength microstrip line (5), a second half-wavelength microstrip line (6), third to eighth microstrip lines (7-12), a coupling microstrip line (13) and a capacitor (14);
wherein the first feeder line (1) and the second feeder line (2) correspond to a pair of balanced input ports, and the third feeder line (3) and the fourth feeder line (4) correspond to a pair of balanced output ports; the two ends of the first half-wavelength microstrip line (5) are correspondingly connected with the first feeder line (1) and the second feeder line (2) respectively, and the two ends of the second half-wavelength microstrip line (6) are correspondingly connected with the third feeder line (3) and the fourth feeder line (4) respectively;
the third microstrip line (7) and the seventh microstrip line (11) are connected in series, one end of the fifth microstrip line (9) is connected to the connection part of the third microstrip line (7) and the seventh microstrip line (11), and the other end of the fifth microstrip line (9) is grounded; the fourth microstrip line (8) and the eighth microstrip line (12) are connected in series, one end of the sixth microstrip line (10) is connected to the connection part of the fourth microstrip line (8) and the eighth microstrip line (12), and the other end of the sixth microstrip line (10) is grounded;
the capacitor (14) is connected between two ports on one side of the coupling microstrip line (13), and the two ports are correspondingly connected with one end of the seventh microstrip line (11) and one end of the eighth microstrip line (12) respectively; two ports on the other side of the coupling microstrip line (13) are grounded;
the physical dimensions of the third microstrip line and the fourth microstrip line in the main line structure are different from those of the third microstrip line and the fourth microstrip line in the reference line structure, and the phase difference generated by the physical dimensions is used as a phase shift reference value of the phase shifter.
2. The balanced broadband filtering phase shifter of claim 1, wherein the overall structure of the main line and the reference line are both symmetrical along a longitudinal centerline.
3. The balanced broadband filtering phase shifter according to claim 1, characterized in that when the phase shifter is excited by a differential mode signal, one transmission zero is generated on the left side of the differential mode transmission response and two transmission zeros are generated on the right side under the combined action of the capacitor (14) and the coupling microstrip line (13); the transmission zero point at the left side is regulated and controlled by a capacitor (14), and when the capacitance value is reduced, the transmission zero point moves to high frequency; the two transmission zeros on the right side are regulated and controlled by the electric length of the coupling microstrip line (13), and when the electric length is increased, the transmission zeros move to low frequency; under the action of the fifth microstrip line (9) and the sixth microstrip line (10), a transmission zero point is also generated on the right side of the differential mode transmission response, and the transmission zero point moves to low frequency when the electrical lengths of the fifth microstrip line (9) and the sixth microstrip line (10) are increased.
4. Balance type wideband filtering phase shifter according to claim 1, characterized in that the fifth microstrip line (9) and the sixth microstrip line (10), the capacitor (14) and the coupling microstrip line (13) are simultaneously used for generating a differential mode transmission pole and a common mode transmission zero, so that the phase shifter has wideband differential mode impedance matching and wideband common mode rejection performance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331626.6A CN117219987A (en) | 2023-10-16 | 2023-10-16 | Balance type broadband filtering phase shifter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331626.6A CN117219987A (en) | 2023-10-16 | 2023-10-16 | Balance type broadband filtering phase shifter |
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| CN117219987A true CN117219987A (en) | 2023-12-12 |
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- 2023-10-16 CN CN202311331626.6A patent/CN117219987A/en active Pending
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