CN115149230B - Balance ultra-wideband band-pass filter with harmonic suppression function - Google Patents
Balance ultra-wideband band-pass filter with harmonic suppression function Download PDFInfo
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- CN115149230B CN115149230B CN202210892475.0A CN202210892475A CN115149230B CN 115149230 B CN115149230 B CN 115149230B CN 202210892475 A CN202210892475 A CN 202210892475A CN 115149230 B CN115149230 B CN 115149230B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a balanced ultra-wideband band-pass filter with a harmonic suppression function, which comprises a balanced differential input port A, a balanced differential output port B, four groups of quarter-wavelength asymmetric coupling transmission lines, two sections of quarter-wavelength differential transmission lines, two sections of quarter-wavelength filtering connecting lines, two sections of quarter-wavelength terminal short-circuit lines, four sections of harmonic suppression open-circuit branches and common-mode suppression compensation branches. In order to design the balance type filter as a single device and realize the function expansion of ultra-wideband filtering and harmonic suppression characteristics, the invention provides the balance type ultra-wideband band-pass filter with the harmonic suppression function.
Description
Technical Field
The invention relates to a balanced band-pass filter, in particular to a balanced ultra-wideband band-pass filter with a harmonic suppression function.
Background
In recent years, balanced circuits have played an important role in wireless communication systems. The balanced circuit can efficiently suppress environmental noise and noise generated from internal active devices, and thus has superior electromagnetic compatibility characteristics, relative to unbalanced single-ended input and single-ended output circuits. A wide variety of rf microwave devices, such as filters, mixers, and power amplifiers, are used in balanced topologies. With the rapid development of integrated circuits, the need for balanced devices is becoming more stringent. The balanced filter is required to have a filter characteristic at the time of differential mode signal input while being capable of effectively suppressing common mode noise. The balanced filter may be constructed by one single-port filter and two balun, but its area is huge. Therefore, it is an important problem to design the balanced filter as a single device without adding additional balun.
The ultra-wideband technology plays an important role in the civil and military communication fields all the time, and has the characteristics of good concealment, small average power, high processing gain, high transmission rate, strong penetrating power and the like, so that the ultra-wideband technology is more and more widely focused, and meanwhile, the ultra-wideband technology also has strong practicability, competitiveness and vitality in the communication technical field. The traditional ultra-wideband multimode filter based on the microstrip technology has the advantages of low loss, high return loss, small size and the like, but has the defects of narrower stop band and poorer out-of-band rejection, and cannot meet the requirement of the ultra-wideband filter on high performance, so that the research of the ultra-wideband filter with good out-of-band rejection characteristic has great significance. In view of this, it is necessary to provide a balanced ultra-wideband filter with harmonic rejection.
Disclosure of Invention
According to the problems existing in the prior art, the invention discloses a balanced ultra-wideband band-pass filter with a harmonic suppression function, which comprises a balanced differential input port A, a balanced differential output port B, four groups of quarter-wavelength asymmetric coupling transmission lines, two sections of quarter-wavelength differential transmission lines, two sections of quarter-wavelength filtering connecting lines, two sections of quarter-wavelength terminal short-circuit lines, four sections of harmonic suppression open-circuit branches and common-mode suppression compensation branches;
the balanced differential input port A comprises an input port A+ and an input port A-;
the balanced differential output port B comprises an output port B+ and an output port B-;
the four groups of quarter-wavelength asymmetric coupling transmission lines comprise a first asymmetric coupling transmission line, a second asymmetric coupling transmission line, a third asymmetric coupling transmission line and a fourth asymmetric coupling transmission line;
the two sections of quarter-wavelength differential transmission lines comprise a first differential transmission line and a second differential transmission line;
the two sections of quarter-wavelength filter connecting lines comprise a first filter connecting line and a second filter connecting line;
the two quarter-wavelength terminal short-circuit lines comprise a first terminal short-circuit line and a second terminal short-circuit line;
the four-section harmonic suppression open circuit branch comprises a first harmonic suppression open circuit branch, a second harmonic suppression open circuit branch, a third harmonic suppression open circuit branch and a fourth harmonic suppression open circuit branch;
the first asymmetrically coupled transmission line includes a first low impedance transmission line and a first high impedance transmission line; one end of the first low-impedance transmission line is connected with the input port A+ and the other end of the first low-impedance transmission line is open; one end of the first high-impedance transmission line is open, and the other end of the first high-impedance transmission line is connected with the first filtering connecting line;
one end of the first differential transmission line is connected with the connection part of the input port A+ and the first low-impedance transmission line, and the other end of the first differential transmission line is connected with the second differential transmission line; one end of the second differential transmission line is connected with the connection part of the input port A-and the second low-impedance transmission line, and the other end of the second differential transmission line is connected with the first differential transmission line;
one end of the first filtering connecting wire is connected to the joint of the first high-impedance transmission line and the third high-impedance transmission line, and the other end of the first filtering connecting wire is connected with the second filtering connecting wire; one end of the second filter connecting wire is connected to the joint of the second high-impedance transmission line and the fourth high-impedance transmission line, and the other end of the second filter connecting wire is connected with the first filter connecting wire;
one end of the first terminal short circuit line is connected with the connection part of the output port B+ and the third low-impedance transmission line, and the other end of the first terminal short circuit line is grounded and short-circuited; one end of the second terminal short circuit line is connected with the connection part of the output port B-and the fourth low-impedance transmission line, and the other end of the second terminal short circuit line is grounded and short-circuited;
the first harmonic suppression open circuit branch, the second harmonic suppression open circuit branch, the third harmonic suppression open circuit branch and the fourth harmonic suppression open circuit branch have the same structure; one end of the first harmonic suppression open-circuit branch is connected into the first high-impedance transmission line, and the other end of the first harmonic suppression open-circuit branch is open-circuited;
and one end of the common mode rejection compensation branch is connected with the joint of the first differential transmission line and the second differential transmission line, and the other end of the common mode rejection compensation branch is open.
Further, the first, second, third and fourth asymmetrically coupled transmission lines have the same structure.
Further, the filtering characteristics of the differential mode signal are adjusted by adjusting the first, second, third, and fourth asymmetrically coupled transmission lines.
Further, the harmonic suppression characteristics of the differential mode signal are adjusted by adjusting the access positions, the impedance values, and the electrical lengths of the first harmonic suppression open circuit branch, the second harmonic suppression open circuit branch, the third harmonic suppression open circuit branch, and the fourth harmonic suppression open circuit branch.
Further, the suppression characteristic of the common mode signal is adjusted by adjusting the impedance value and the electrical length of the common mode suppression compensation branch.
In order to design the balance type filter as a single device and realize the function expansion of ultra-wideband filtering and harmonic suppression characteristics, the invention provides the balance type ultra-wideband band-pass filter with the harmonic suppression function.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a balanced ultra-wideband band-pass filter with harmonic rejection according to the present invention;
FIG. 2 is a graph of the amplitude of a mixed S parameter under differential mode signal excitation of a balanced ultra-wideband band-pass filter with harmonic suppression function according to the present invention;
fig. 3 is a graph of the amplitude of a mixed S-parameter under excitation of a common mode signal of a balanced ultra-wideband band-pass filter with harmonic rejection.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clear, the technical scheme in the embodiment of the present invention is clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention:
a balanced ultra-wideband band-pass filter with harmonic rejection as shown in fig. 1 comprises: the balanced differential input port A, the balanced differential output port B, four groups of quarter-wavelength asymmetric coupling transmission lines, two sections of quarter-wavelength differential transmission lines, two sections of quarter-wavelength filter connecting lines, two sections of quarter-wavelength terminal short-circuit lines, four sections of harmonic suppression open-circuit branches and common mode suppression compensation branches 5.
The balanced differential input port A comprises an input port A+1 and an input port A-2;
the balanced differential output port B comprises an output port B+3 and an output port B-4;
the four groups of quarter-wavelength asymmetric coupling transmission lines comprise a first asymmetric coupling transmission line 6, a second asymmetric coupling transmission line 7, a third asymmetric coupling transmission line 8 and a fourth asymmetric coupling transmission line 9;
the two-section quarter-wavelength differential transmission line comprises a first differential transmission line 10 and a second differential transmission line 11;
the two sections of quarter-wavelength filter connecting lines comprise a first filter connecting line 12 and a second filter connecting line 13;
the two quarter wavelength terminal short-circuit lines include a first terminal short-circuit line 14 and a second terminal short-circuit line 15;
the four-segment harmonic suppression open circuit branch comprises a first harmonic suppression open circuit branch 16, a second harmonic suppression open circuit branch 17, a third harmonic suppression open circuit branch 18 and a fourth harmonic suppression open circuit branch 19;
the first asymmetric coupling transmission line 6, the second asymmetric coupling transmission line 7, the third asymmetric coupling transmission line 8 and the fourth asymmetric coupling transmission line 9 have the same structure; the first asymmetrically coupled transmission line 6 includes a first low impedance transmission line 61 and a first high impedance transmission line 62; wherein one end of the first low impedance transmission line 61 is connected with the input port a+1, and the other end is open; one end of the first high-impedance transmission line 62 is open, and the other end is connected with the first filter connection line 12;
one end of the first differential transmission line 10 is connected to the connection part between the input port a+1 and the first low impedance transmission line 61, and the other end is connected to the second differential transmission line 11; one end of the second differential transmission line 11 is connected to the connection part between the input port A-2 and the second low impedance transmission line 71, and the other end is connected to the first differential transmission line 10;
one end of the first filter connecting wire 12 is connected to the connection part of the first high-impedance transmission line 62 and the third high-impedance transmission line 82, and the other end is connected to the second filter connecting wire 13; one end of the second filter connection line 13 is connected to the connection position of the second high-impedance transmission line 72 and the fourth high-impedance transmission line 92, and the other end is connected to the first filter connection line 12;
one end of the first terminal short-circuit line 14 is connected to the connection part of the output port B+3 and the third low-impedance transmission line 81, and the other end of the first terminal short-circuit line is grounded and short-circuited; one end of the second terminal short-circuit line 15 is connected to the connection part of the output port B-4 and the fourth low-impedance transmission line 91, and the other end is grounded and short-circuited;
the first harmonic suppression open circuit branch 16, the second harmonic suppression open circuit branch 17, the third harmonic suppression open circuit branch 18 and the fourth harmonic suppression open circuit branch 19 have the same structure; wherein one end of the first harmonic suppression open circuit branch 16 is connected into the first high-impedance transmission line 62, and the other end is open circuit;
one end of the common mode rejection compensation branch 5 is connected with the joint of the first differential transmission line 10 and the second differential transmission line 11, and the other end is open.
The filter characteristics of the differential mode signal are adjusted by adjusting the first asymmetric coupling transmission line 6, the second asymmetric coupling transmission line 7, the third asymmetric coupling transmission line 8 and the fourth asymmetric coupling transmission line 9.
The harmonic suppression characteristics of the differential mode signal are adjusted by adjusting the access positions, impedance values, and electrical lengths of the first harmonic suppression open circuit branch 16, the second harmonic suppression open circuit branch 17, the third harmonic suppression open circuit branch 18, and the fourth harmonic suppression open circuit branch 19.
The suppression characteristic of the common mode signal is adjusted by adjusting the impedance value and the electrical length of the common mode suppression compensation branch 5.
In order to further describe the balanced ultra-wideband band-pass filter with the harmonic suppression function provided by the invention, the following specific examples are implemented on the premise of the technical scheme of the invention, but the protection scope of the invention is not limited to the following embodiments, and the methods used in the following embodiments are conventional methods unless otherwise specified.
Specific examples: this example illustrates a balanced ultra-wideband band-pass filter with harmonic rejection. As shown in FIG. 2, the balanced ultra-wideband band-pass filter with harmonic suppression function according to the invention has an input port reflection coefficient |S under the excitation of differential mode signals at a center frequency of 2.6GHz ddAA The I is-28.5 dB, and the differential mode transmission coefficient S is ddBA The I is-0.23 dB, the 3dB differential mode transmission relative bandwidth is 108%, meanwhile, in the wide stop band of 4.28GHz to 12.14GHz, harmonic suppression is better than 20dB, and the out-of-band suppression range of the differential mode signal can reach 4.7 times of the center frequency. As shown in FIG. 3, a balanced ultra-wideband band-pass filter with harmonic suppression function according to the present invention suppresses |S in common mode transmission under common mode signal excitation ccBA The frequency range of 0 to 9.7GHz is less than-10 dB. The balanced ultra-wideband band-pass filter with the harmonic suppression function not only suppresses common mode noise, but also achieves ultra-wideband filtering characteristics and harmonic suppression functions for differential mode signals.
In summary, the balanced ultra-wideband filter with the harmonic suppression function can effectively suppress common-mode noise, simultaneously realize ultra-wideband filtering characteristics of differential mode signals, and expand the harmonic suppression function of the balanced filter, thereby enhancing the out-of-band suppression characteristics of the differential mode signals, and being very suitable for various balanced microwave systems to improve the overall performance of the system.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. A balanced ultra-wideband band-pass filter with harmonic rejection function, characterized by comprising: the device comprises a balanced differential input port A, a balanced differential output port B, four groups of quarter-wavelength asymmetric coupling transmission lines, two sections of quarter-wavelength differential transmission lines, two sections of quarter-wavelength filtering connecting lines, two sections of quarter-wavelength terminal short-circuit lines, four sections of harmonic suppression open-circuit branches and common-mode suppression compensation branches (5);
the balanced differential input port A comprises an input port A+ (1) and an input port A- (2);
the balanced differential output port B comprises an output port B+ (3) and an output port B- (4);
the four groups of quarter-wavelength asymmetric coupling transmission lines comprise a first asymmetric coupling transmission line (6), a second asymmetric coupling transmission line (7), a third asymmetric coupling transmission line (8) and a fourth asymmetric coupling transmission line (9);
the two-section quarter-wavelength differential transmission line comprises a first differential transmission line (10) and a second differential transmission line (11);
the two-section quarter-wavelength filter connecting line comprises a first filter connecting line (12) and a second filter connecting line (13);
the two-section quarter-wavelength terminal short-circuit line comprises a first terminal short-circuit line (14) and a second terminal short-circuit line (15);
the four-section harmonic suppression open circuit branch comprises a first harmonic suppression open circuit branch (16), a second harmonic suppression open circuit branch (17), a third harmonic suppression open circuit branch (18) and a fourth harmonic suppression open circuit branch (19);
the first asymmetrically coupled transmission line (6) comprises a first low impedance transmission line (61) and a first high impedance transmission line (62); wherein one end of the first low-impedance transmission line (61) is connected with the input port A+ (1), and the other end of the first low-impedance transmission line is open; one end of the first high-impedance transmission line (62) is open, and the other end of the first high-impedance transmission line is connected with the first filtering connecting line (12);
one end of the first differential transmission line (10) is connected with the connection part of the input port A+ (1) and the first low-impedance transmission line (61), and the other end of the first differential transmission line is connected with the second differential transmission line (11); one end of the second differential transmission line (11) is connected with the connection part of the input port A- (2) and the second low-impedance transmission line (71), and the other end of the second differential transmission line is connected with the first differential transmission line (10);
one end of the first filtering connecting wire (12) is connected with the joint of the first high-impedance transmission line (62) and the third high-impedance transmission line (82), and the other end of the first filtering connecting wire is connected with the second filtering connecting wire (13); one end of the second filter connecting wire (13) is connected to the joint of the second high-impedance transmission wire (72) and the fourth high-impedance transmission wire (92), and the other end of the second filter connecting wire is connected with the first filter connecting wire (12);
one end of the first terminal short circuit line (14) is connected with the connecting part of the output port B+ (3) and the third low-impedance transmission line (81), and the other end of the first terminal short circuit line is grounded and short-circuited; one end of the second terminal short circuit line (15) is connected with the connecting part of the output port B- (4) and the fourth low-impedance transmission line (91), and the other end of the second terminal short circuit line is grounded and short-circuited;
the first harmonic suppression open-circuit branch (16), the second harmonic suppression open-circuit branch (17), the third harmonic suppression open-circuit branch (18) and the fourth harmonic suppression open-circuit branch (19) have the same structure; wherein one end of the first harmonic suppression open circuit branch (16) is connected into the first high-impedance transmission line (62), and the other end is open circuit;
one end of the common mode rejection compensation branch (5) is connected with the joint of the first differential transmission line (10) and the second differential transmission line (11), and the other end is open.
2. The balanced ultra-wideband band-pass filter with harmonic rejection function according to claim 1, characterized in that: the first asymmetric coupling transmission line (6), the second asymmetric coupling transmission line (7), the third asymmetric coupling transmission line (8) and the fourth asymmetric coupling transmission line (9) have the same structure.
3. The balanced ultra-wideband band-pass filter with harmonic rejection function according to claim 2, characterized in that: the filter characteristics of the differential mode signal are adjusted by adjusting the first asymmetric coupling transmission line (6), the second asymmetric coupling transmission line (7), the third asymmetric coupling transmission line (8) and the fourth asymmetric coupling transmission line (9).
4. The balanced ultra-wideband band-pass filter with harmonic rejection function according to claim 1, characterized in that: the harmonic suppression characteristics of the differential mode signal are adjusted by adjusting the access positions, impedance values, and electrical lengths of the first harmonic suppression open circuit branch (16), the second harmonic suppression open circuit branch (17), the third harmonic suppression open circuit branch (18), and the fourth harmonic suppression open circuit branch (19).
5. The balanced ultra-wideband band-pass filter with harmonic rejection function according to claim 1, characterized in that: the suppression characteristic of the common mode signal is adjusted by adjusting the impedance value and the electrical length of the common mode suppression compensation branch (5).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915665A (en) * | 2014-03-28 | 2014-07-09 | 南京航空航天大学 | Compact type UWB dual-band trap balancing band-pass filter |
| CN110380169A (en) * | 2019-06-27 | 2019-10-25 | 南京理工大学 | A kind of adjustable ultra-wide band filter of trap frequency with improvement band-stop response |
| CN110600846A (en) * | 2019-08-30 | 2019-12-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband band-pass filter with transmission zero |
| CN112332051A (en) * | 2020-10-27 | 2021-02-05 | 广州天极电子科技有限公司 | Ultra-wideband filter |
-
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- 2022-07-27 CN CN202210892475.0A patent/CN115149230B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915665A (en) * | 2014-03-28 | 2014-07-09 | 南京航空航天大学 | Compact type UWB dual-band trap balancing band-pass filter |
| CN110380169A (en) * | 2019-06-27 | 2019-10-25 | 南京理工大学 | A kind of adjustable ultra-wide band filter of trap frequency with improvement band-stop response |
| CN110600846A (en) * | 2019-08-30 | 2019-12-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband band-pass filter with transmission zero |
| CN112332051A (en) * | 2020-10-27 | 2021-02-05 | 广州天极电子科技有限公司 | Ultra-wideband filter |
Non-Patent Citations (1)
| Title |
|---|
| 基于多次波自适应抑制的宽带带通滤波器谐波检测系统设计;黄瑞祥;电子器件;第45卷(第1期);106-111 * |
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