CN117614408A - Lumped filter phase shifter circuit - Google Patents
Lumped filter phase shifter circuit Download PDFInfo
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- CN117614408A CN117614408A CN202410096303.1A CN202410096303A CN117614408A CN 117614408 A CN117614408 A CN 117614408A CN 202410096303 A CN202410096303 A CN 202410096303A CN 117614408 A CN117614408 A CN 117614408A
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- 239000003990 capacitor Substances 0.000 claims abstract description 78
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 12
- 230000010363 phase shift Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
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Abstract
The invention discloses a lumped filter phase shifter circuit, which comprises a capacitor and an inductance element; the unit structure comprises two inductors and capacitors, wherein the two inductors are mutually cascaded, two ends of the cascaded inductors are connected with a capacitor in parallel, and the joint of the cascaded inductors is connected with a capacitor to ground. By this connection, the unit can be equivalent to a section of transmission line of a specific impedance and specific electrical length, and compared with a distributed structure with a size comparable to the wavelength, the lumped structure can greatly reduce the size of the device. In addition, the phase shifting function and the filtering function are combined into a whole, and the purpose of miniaturization is further achieved. By varying the capacitance to ground equivalent cell values at port1 and port2, different phase shift angles can be achieved. In addition, the size of the phase shifter of the distributed structure is comparable with the wavelength, and the size of the lumped element can be far smaller than the working wavelength.
Description
Technical Field
The invention belongs to the technical field of microwaves, and particularly relates to a lumped filter phase shifter circuit.
Background
With the development of modern wireless communication technology, wireless communication systems and devices are evolving toward miniaturization. The integration level of the system is higher and higher. This requires that the corresponding functional module has a miniaturized nature, and that the filter is an important microwave device, which is applied in the circuits of the radio frequency front end of almost all communication systems. Since filters generally occupy a relatively large space in the rf front-end, the current research focus is to fuse them with other microwave devices, so that the size of the whole system is reduced. The conventional broadband phase shifter adopts a uniform transmission line as a reference path, so that the phase shifter loses the filtering characteristic, and therefore, a new class of filtering phase shifter with both a phase shifting function and a filtering function needs to be researched, and the phase shifter also has the characteristic of miniaturization.
Disclosure of Invention
The invention aims to: the invention aims to provide a lumped filter phase shifter circuit, which is a miniaturized filter phase shifter with integrated filter and phase shift functions.
The technical scheme is as follows: the lumped filter phase shifter circuit is equivalent to a transmission line with specific impedance and specific electric length through specific connection of a capacitor and an inductor; a section of characteristic impedance is Z 0 The transmission line with the electric length of theta is equivalent to cascade connection of two coupling inductors, two ends of each inductor are connected with a capacitor in parallel, the cascade connection of the inductors is connected with a capacitor, the other end of the capacitor is grounded, the calculation is carried out by the following formula,L s is the inductance value of the two coupled inductances,L m in order to couple the mutual inductance value of the inductor,C s in order to achieve a capacitance value of the capacitance to ground,C p for the capacitance value of the two ends of the coupling inductance in parallel, Z 0 For transmission line characteristic impedance, electrical lengthI.e. +.>Calculated from the transmission line electrical length and angular frequency: />；
The specific connection mode is as follows: the first port1 and the second port2 are connected in cascade by a third inductor (21), a fourth inductor (22), a fifth inductor (31), a sixth inductor (32), a seventh inductor (41) and an eighth inductor (42);
one end of the third capacitor (23) is connected to the connection part of the first port1 and the third inductor (21), and the other end of the third capacitor is connected to the connection part of the fourth inductor (22) and the fifth inductor (31);
one end of the fourth capacitor (24) is connected to the connection part of the third inductor (21) and the fourth inductor (22), and the other end of the fourth capacitor is grounded;
one end of the fifth capacitor (33) is connected to the connection part of the fourth inductor (22) and the fifth inductor (31), and the other end of the fifth capacitor is connected to the connection part of the sixth inductor (32) and the seventh inductor (41);
one end of the sixth capacitor (34) is connected to the connection part of the fifth inductor (31) and the sixth inductor (32), and the other end of the sixth capacitor is grounded;
one end of the seventh capacitor (43) is connected to the connection part of the sixth inductor (32) and the seventh inductor (41), and the other end of the seventh capacitor is connected to the connection part of the eighth inductor (42) and the second port 2;
one end of the eighth capacitor (44) is connected to the connection part of the seventh inductor (41) and the eighth inductor (42), and the other end is grounded.
Further, the circuit further comprises a first capacitor, a second capacitor, a first inductor and a second inductor, wherein one end of the first inductor is connected to the joint of the first port1 and the third inductor, and the other end of the first inductor is connected with the second inductor in a cascading manner; one end of the first capacitor is connected to the joint of the first port1 and the third inductor, and the other end of the first capacitor is connected with the other end of the second inductor; one end of the second capacitor is connected to the connection part of the first inductor and the second inductor, and the other end of the second capacitor is grounded.
Further, the circuit further comprises a ninth capacitor, a tenth capacitor, a ninth inductor and a tenth inductor; one end of the tenth inductor is connected to the joint of the second port2 and the eighth inductor, and the other end of the tenth inductor is connected with a ninth inductor in series; one end of the ninth capacitor is connected to the connection part of the second port2 and the eighth inductor, and the other end of the ninth capacitor is connected with the other end of the ninth inductor; one end of the tenth capacitor is connected to the connection part of the ninth inductor and the tenth inductor, and the other end of the tenth capacitor is grounded.
Further, the connection part of the first capacitor and the second inductor is grounded.
Further, the connection part of the ninth capacitor and the ninth inductor is grounded.
Further, there is coupling between the third inductance and the fourth inductance, between the fifth inductance and the sixth inductance, and between the seventh inductance and the eighth inductance.
Further, there is a coupling between the first inductance and the second inductance.
Further, there is a coupling between the ninth inductance and the tenth inductance.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: the lumped filter phase shifter circuit provided by the invention has both a filter function and a phase shifting function, and can realize the screening of signals in a specific frequency band. By changing the capacitance and inductance values between the port1 and the port2, filtering of different frequency bands can be realized, and screening of signals with specific frequencies can be realized. And by changing the capacitance and inductance values of the equivalent units to ground at port1 and port2, different phase shift angles can be achieved. In addition, the size of the phase shifter of the distributed structure is comparable with the wavelength, and the size of the lumped element can be far smaller than the working wavelength.
Drawings
FIG. 1 is a circuit diagram of a lumped filtered phase shifter of the present invention;
FIG. 2 is a circuit diagram of a reference channel of the lumped filter phase shifter of the present invention;
FIG. 3 is a graph of simulated S parameters of an ADS for the lumped filtered phase shifter of the present invention;
FIG. 4 is a graph of simulated phase shift characteristics of ADS for the lumped filtered phase shifter of the present invention;
fig. 5 is a schematic diagram of lumped parameter elements instead of transmission lines.
In fig. 1: 1. the first coupling, 11 first inductance, 12 second inductance, 13 first capacitance, 14 second capacitance, 2.second coupling, 21.third inductance, 22.fourth inductance, 23.third capacitance, 24.fourth capacitance, 3.third coupling, 31.fifth inductance, 32.sixth inductance, 33.fifth capacitance, 34.sixth capacitance, 4.fourth coupling, 41.seventh inductance, 42.eighth inductance, 43.seventh capacitance, 44.eighth capacitance, 5.fifth coupling, 51.ninth inductance, 52.tenth inductance, 53.ninth capacitance, 54.tenth capacitance.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
As shown in fig. 1, the present invention provides a lumped filter phase shifter circuit, which can be equivalent to a transmission line of a specific impedance and a specific electrical length through specific connection of a capacitor and an inductor. A section of characteristic impedance is Z 0 The transmission line with the electric length of theta is equivalent to cascade connection of two coupling inductors, two ends of each inductor are connected with a capacitor in parallel, the cascade connection of the inductors is connected with a capacitor, the other end of the capacitor is grounded, the calculation is carried out by the following formula,L s is the inductance value of the two coupled inductances,L m in order to couple the mutual inductance value of the inductor,C s in order to achieve a capacitance value of the capacitance to ground,C p for the capacitance value of the two ends of the coupling inductance in parallel, Z 0 For transmission line characteristic impedance, electrical lengthI.e. +.>Calculated from the transmission line electrical length and angular frequency:
the specific connection mode is that the third inductor 21, the fourth inductor 22, the fifth inductor 31, the sixth inductor 32, the seventh inductor 41 and the eighth inductor 42 are connected in cascade between the 1 port and the 2 port.
One end of the third capacitor 23 is connected to the connection part of the port1 and the third inductor 21, and the other end is connected to the connection part of the fourth inductor 22 and the fifth inductor 31;
one end of the fourth capacitor 24 is connected to the connection part of the third inductor 21 and the fourth inductor 22, and the other end is grounded;
one end of the fifth capacitor 33 is connected to the connection part of the fourth inductor 22 and the fifth inductor 31, and the other end is connected to the connection part of the sixth inductor 32 and the seventh inductor 41;
one end of the sixth capacitor 34 is connected to the connection part of the fifth inductor 31 and the sixth inductor 32, and the other end is grounded;
one end of the seventh capacitor 43 is connected to the connection part of the sixth inductor 32 and the seventh inductor 41, and the other end is connected to the connection part of the eighth inductor 42 and the port 2;
one end of the eighth capacitor 44 is connected to the connection part of the seventh inductor 41 and the eighth inductor 42, and the other end is grounded;
one end of the first inductor 11 is connected to the connection part of the port1 and the third inductor 21, and the other end is connected with the second inductor 12 in cascade. One end of the first capacitor is connected to the connection part of the port1 and the third inductor 21, and one end of the first capacitor is connected to the other end of the second inductor 12. One end of the second capacitor is connected to the connection part of the first inductor 11 and the second inductor 12, and the other end is grounded.
One end of the tenth inductor 52 is connected to the connection between the port2 and the eighth inductor 42, and the other end is connected with the ninth inductor 51 in cascade. One end of the ninth capacitor 53 is connected to the connection between the port2 and the eighth inductor 42, and one end is connected to the other end of the ninth inductor 51. One end of the tenth capacitor 54 is connected to the connection between the ninth inductor 51 and the tenth inductor 52, and the other end is grounded.
The connection between the first capacitor 13 and the second inductor 12 is grounded.
The connection between the ninth capacitor 53 and the ninth inductor 51 is grounded.
There is a coupling between the first inductance 11 and the second inductance 12, between the third inductance 21 and the fourth inductance 22, between the fifth inductance 31 and the sixth inductance 32, between the seventh inductance 41 and the eighth inductance 42, between the ninth inductance 51 and the tenth inductance 52.
The lumped filter phase shifter circuit design method of the invention is as follows:
(1) The distributed parameter circuit is lumped and equivalent according to the structure shown in fig. 5, so that the microstrip line circuit is completely converted into lumped element parameters, and corresponding capacitance and inductance values are calculated according to the characteristic impedance and the electrical length of each section of transmission line. The size of the lumped element is far smaller than the working wavelength, and the miniaturization of the filter phase shifter is realized through the lumped of the microstrip line, so that the filter phase shifter is easier to integrate.
(2) The circuit shown in figures 1 and 2 is built in the circuit simulation software ADS, the element values are calculated, figure 2 is a reference channel of the filter, a prototype is a section of characteristic impedance Z 0 Fig. 1 shows a filter phase shifter circuit according to the present invention.
(3) The cascade structure between port1 and port2 of the filtering phase shifter circuit shown in fig. 1 is equivalent to a multimode resonator, the circuit realizes the filtering function, and the change of the filtering frequency band can be realized by adjusting the element values. The ground structure connected at the port1 and the port2 is equivalent to branch loading, and the adjustment of the phase shift angle can be realized by adjusting the element value at the point.
(4) The designed phase shift angle of the circuit is 90 degrees, and the calculated element value is finely adjusted to obtain a circuit simulation performance diagram, as shown in fig. 3, and the phase shift result is shown in fig. 4.
From simulation results, the filtering phase shifter circuit has filtering and phase shifting characteristics, the filtering frequency band is 1.55GHz-4.25GHz, the center frequency f0=2.9 GHz, the relative bandwidth reaches 93%, a 90-degree phase shift value is realized in the passband, the phase shift floating in the passband is smaller than 5 degrees, and through the analysis, if the frequency band of the filter needs to be changed, the element values between the port1 and the port2, namely the element values of L2, L3, C4, C5 and C6 and the coupling strength of M2 and M3 are mainly adjusted. If different phase shift angles are needed, the values of the L1, C1 and C2 elements and the coupling strength of M1 are mainly adjusted.
The circuit of the invention has the characteristics of filtering and phase shifting, and completely integrates the distributed parameter elements, thereby effectively saving the occupied area of devices and meeting the current requirements of miniaturization and high integration.
The above-described embodiments are illustrative, and not to be construed as limiting the invention, and variations, modifications, alternatives, and alternatives to the above-described embodiments may be made by one of ordinary skill in the art within the scope of the invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (8)
1. A lumped filter phase shifter circuit characterized by a transmission line equivalent to a specific impedance and a specific electrical length through a specific connection of a capacitor and an inductor; a section of characteristic impedance is Z 0 The transmission line with the electric length of theta is equivalent to cascade connection of two coupling inductors, two ends of each inductor are connected with a capacitor in parallel, the cascade connection of the inductors is connected with a capacitor, the other end of the capacitor is grounded, the calculation is carried out by the following formula,L s is the inductance value of the two coupled inductances,L m in order to couple the mutual inductance value of the inductor,C s in order to achieve a capacitance value of the capacitance to ground,C p for the capacitance value of the two ends of the coupling inductance in parallel, Z 0 For transmission line characteristic impedance, electrical lengthI.e. +.>Calculated from the transmission line electrical length and angular frequency: />；
The specific connection mode is as follows: the first port1 and the second port2 are connected in cascade by a third inductor (21), a fourth inductor (22), a fifth inductor (31), a sixth inductor (32), a seventh inductor (41) and an eighth inductor (42);
one end of the third capacitor (23) is connected to the connection part of the first port1 and the third inductor (21), and the other end of the third capacitor is connected to the connection part of the fourth inductor (22) and the fifth inductor (31);
one end of the fourth capacitor (24) is connected to the connection part of the third inductor (21) and the fourth inductor (22), and the other end of the fourth capacitor is grounded;
one end of the fifth capacitor (33) is connected to the connection part of the fourth inductor (22) and the fifth inductor (31), and the other end of the fifth capacitor is connected to the connection part of the sixth inductor (32) and the seventh inductor (41);
one end of the sixth capacitor (34) is connected to the connection part of the fifth inductor (31) and the sixth inductor (32), and the other end of the sixth capacitor is grounded;
one end of the seventh capacitor (43) is connected to the connection part of the sixth inductor (32) and the seventh inductor (41), and the other end of the seventh capacitor is connected to the connection part of the eighth inductor (42) and the second port 2;
one end of the eighth capacitor (44) is connected to the connection part of the seventh inductor (41) and the eighth inductor (42), and the other end is grounded.
2. A lumped filter phase shifter circuit as claimed in claim 1, characterized in that the circuit further comprises a first capacitor (13), a second capacitor (14), a first inductor (11) and a second inductor (12), wherein one end of the first inductor (11) is connected to the connection between the first port1 and the third inductor (21), and the other end is connected to the second inductor (12) in cascade; one end of the first capacitor (13) is connected to the joint of the first port1 and the third inductor (21), and the other end of the first capacitor is connected with the other end of the second inductor (12); one end of the second capacitor (14) is connected to the connection part of the first inductor (11) and the second inductor (12), and the other end of the second capacitor is grounded.
3. A lumped filter phase shifter circuit as claimed in claim 1, characterized in that the circuit further comprises a ninth capacitor (53), a tenth capacitor (54), a ninth inductor (51) and a tenth inductor (52); one end of the tenth inductor (52) is connected to the joint of the second port2 and the eighth inductor (42), and the other end of the tenth inductor is connected with the ninth inductor (51) in series; one end of the ninth capacitor (53) is connected to the connection part of the second port2 and the eighth inductor (42), and the other end of the ninth capacitor is connected to the other end of the ninth inductor (51); one end of the tenth capacitor (54) is connected to the connection part of the ninth inductor (51) and the tenth inductor (52), and the other end is grounded.
4. A lumped filter phase shifter circuit as claimed in claim 2, characterized in that the junction of the first capacitor (13) and the second inductor (12) is grounded.
5. A lumped filter phase shifter circuit as claimed in claim 3, characterized in that the connection of the ninth capacitor (53) and the ninth inductor (51) is grounded.
6. A lumped filter phase shifter circuit as claimed in claim 1, characterized in that there is a coupling between the third (21) and fourth (22), fifth (31) and sixth (32) and seventh (41) and eighth (42) inductors.
7. A lumped filter phase shifter circuit as claimed in claim 2, characterized in that there is a coupling between the first inductance (11) and the second inductance (12).
8. A lumped filter phase shifter circuit as claimed in claim 3, characterized in that there is a coupling between the ninth inductance (51) and the tenth inductance (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410096303.1A CN117614408A (en) | 2024-01-24 | 2024-01-24 | Lumped filter phase shifter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410096303.1A CN117614408A (en) | 2024-01-24 | 2024-01-24 | Lumped filter phase shifter circuit |
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| CN117614408A true CN117614408A (en) | 2024-02-27 |
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| CN202410096303.1A Pending CN117614408A (en) | 2024-01-24 | 2024-01-24 | Lumped filter phase shifter circuit |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060267709A1 (en) * | 2005-05-31 | 2006-11-30 | York Robert A | Analog phase shifter using cascaded voltage tunable capacitor |
| CN109509940A (en) * | 2018-12-26 | 2019-03-22 | 南京米乐为微电子科技有限公司 | A kind of continuously adjustable analog phase shifter |
| CN113572452A (en) * | 2021-09-23 | 2021-10-29 | 广州慧智微电子有限公司 | Multiphase phase shifter and multiphase phase shifting method |
| CN216251144U (en) * | 2021-11-29 | 2022-04-08 | 成都海微特科技有限公司 | Miniaturized broadband digital phase shifter |
| CN116599484A (en) * | 2023-05-25 | 2023-08-15 | 南京邮电大学 | Ultra-miniature ultra-wideband lumped band-stop filter based on IPD and application thereof |
| CN116646698A (en) * | 2023-06-21 | 2023-08-25 | 南京邮电大学 | Lumped-distributed hybrid bandpass filter |
| CN117155324A (en) * | 2023-08-31 | 2023-12-01 | 南京邮电大学 | Miniaturized multi-zero wide stop band on-chip band-pass filter |
-
2024
- 2024-01-24 CN CN202410096303.1A patent/CN117614408A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060267709A1 (en) * | 2005-05-31 | 2006-11-30 | York Robert A | Analog phase shifter using cascaded voltage tunable capacitor |
| CN109509940A (en) * | 2018-12-26 | 2019-03-22 | 南京米乐为微电子科技有限公司 | A kind of continuously adjustable analog phase shifter |
| CN113572452A (en) * | 2021-09-23 | 2021-10-29 | 广州慧智微电子有限公司 | Multiphase phase shifter and multiphase phase shifting method |
| CN216251144U (en) * | 2021-11-29 | 2022-04-08 | 成都海微特科技有限公司 | Miniaturized broadband digital phase shifter |
| CN116599484A (en) * | 2023-05-25 | 2023-08-15 | 南京邮电大学 | Ultra-miniature ultra-wideband lumped band-stop filter based on IPD and application thereof |
| CN116646698A (en) * | 2023-06-21 | 2023-08-25 | 南京邮电大学 | Lumped-distributed hybrid bandpass filter |
| CN117155324A (en) * | 2023-08-31 | 2023-12-01 | 南京邮电大学 | Miniaturized multi-zero wide stop band on-chip band-pass filter |
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