CN115149230A - Balanced ultra-wideband band-pass filter with harmonic suppression function - Google Patents
Balanced ultra-wideband band-pass filter with harmonic suppression function Download PDFInfo
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- CN115149230A CN115149230A CN202210892475.0A CN202210892475A CN115149230A CN 115149230 A CN115149230 A CN 115149230A CN 202210892475 A CN202210892475 A CN 202210892475A CN 115149230 A CN115149230 A CN 115149230A
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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 a common-mode suppression compensation branch. In order to design a balanced filter as a single device and simultaneously realize the function expansion of ultra-wideband filtering and harmonic suppression characteristics, the invention provides the balanced ultra-wideband band-pass filter with the harmonic suppression function.
Description
Technical Field
The invention relates to a balanced type band-pass filter, in particular to a balanced type 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. Compared with unbalanced single-port input and single-port output circuits, balanced circuits can effectively suppress environmental noise and noise generated by internal active devices, and therefore have excellent electromagnetic compatibility characteristics. Various rf microwave devices, such as filters, mixers, power amplifiers, etc., are used in balanced topologies. With the rapid development of integrated circuits, the demand for balanced devices is more urgent. The balanced filter is required to have a filtering characteristic when a differential mode signal is input, and can effectively suppress common mode noise. A balanced filter can be constructed with one single port filter and two baluns, but its area is large. 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 penetration capacity and the like, so that the ultra-wideband technology is receiving more and more attention, and meanwhile, the ultra-wideband bandwidth also makes the ultra-wideband technology have 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 narrow stop band and poor out-of-band rejection, and cannot meet the requirement of the ultra-wideband filter on high performance, so that the research on the ultra-wideband filter with good out-of-band rejection characteristics has great significance. In view of this, it is necessary to provide a balanced ultra-wideband band-pass filter with a harmonic suppression function.
Disclosure of Invention
According to the problems 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 a common-mode suppression compensation branch;
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 asymmetrically-coupled transmission lines comprise a first asymmetrically-coupled transmission line, a second asymmetrically-coupled transmission line, a third asymmetrically-coupled transmission line and a fourth asymmetrically-coupled 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 filtering connecting lines comprise a first filtering connecting line and a second filtering connecting line;
the two sections of quarter-wavelength terminal short-circuit lines comprise a first terminal short-circuit line and a second terminal short-circuit line;
the four sections of harmonic suppression open-circuit branches comprise 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 comprises 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-circuited; one end of the first high-impedance transmission line is open-circuit, 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 to the joint 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 joint 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 line 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 line is connected with the second filtering connecting line; one end of the second filter connecting line is connected with 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 line is connected with the first filter connecting line;
one end of the first terminal short-circuit line is connected to the connection position 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 joint 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-circuit;
one end of the common mode rejection compensation branch is connected to 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-circuited.
Further, the first asymmetrically-coupled transmission line, the second asymmetrically-coupled transmission line, the third asymmetrically-coupled transmission line, and the fourth asymmetrically-coupled transmission line have the same structure.
Furthermore, the filtering characteristics of the differential-mode signal are adjusted by adjusting the first asymmetrically-coupled transmission line, the second asymmetrically-coupled transmission line, the third asymmetrically-coupled transmission line and the fourth asymmetrically-coupled transmission line.
Furthermore, 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, the second harmonic suppression open-circuit branch, the third harmonic suppression open-circuit branch and the fourth harmonic suppression open-circuit branch.
Furthermore, the common-mode signal rejection characteristic is adjusted by adjusting the impedance value and the electrical length of the common-mode rejection compensation branch.
In order to design a balanced filter as a single device and simultaneously realize the function expansion of ultra-wideband filtering and harmonic suppression characteristics, the invention provides the balanced 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a balanced ultra-wideband band-pass filter with a harmonic suppression function according to the present invention;
FIG. 2 is a mixed S parameter amplitude curve diagram under the excitation of a differential mode signal of a balanced ultra-wideband band-pass filter with a harmonic suppression function according to the present invention;
fig. 3 is a mixed S parameter amplitude curve diagram under the excitation of the common-mode signal of the balanced ultra-wideband band-pass filter with the harmonic suppression function according to the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the drawings in the embodiments of the present invention:
a balanced ultra-wideband band-pass filter with harmonic suppression function as shown in fig. 1 includes: 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 filter connecting lines, two sections of quarter-wavelength terminal short-circuit lines, four sections of harmonic suppression open-circuit branches and a common-mode suppression compensation branch 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 asymmetrically-coupled transmission lines comprise a first asymmetrically-coupled transmission line 6, a second asymmetrically-coupled transmission line 7, a third asymmetrically-coupled transmission line 8 and a fourth asymmetrically-coupled transmission line 9;
the two sections of quarter-wavelength differential transmission lines comprise 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 sections of quarter-wavelength terminal short-circuit lines comprise a first terminal short-circuit line 14 and a second terminal short-circuit line 15;
the four sections of harmonic suppression open-circuit branches comprise 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, the second asymmetrically-coupled transmission line 7, the third asymmetrically-coupled transmission line 8 and the fourth asymmetrically-coupled transmission line 9 have the same structure; said first asymmetrically coupled transmission line 6 comprises a first low impedance transmission line 61 and a first high impedance transmission line 62; one end of the first low-impedance transmission line 61 is connected with the input port A +1, and the other end is open-circuited; one end of the first high-impedance transmission line 62 is open-circuit, and the other end is connected with the first filter connecting line 12;
one end of the first differential transmission line 10 is connected to the connection part of the input port A +1 and the first low-impedance transmission line 61, and the other end is connected with the second differential transmission line 11; one end of the second differential transmission line 11 is connected to the connection part of the input port A-2 and the second low-impedance transmission line 71, and the other end is connected with the first differential transmission line 10;
one end of the first filter connecting line 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 with the second filter connecting line 13; one end of the second filter connecting line 13 is connected to the connection between 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 connecting line 12;
one end of the first terminal short-circuit line 14 is connected to the connection between the output port B +3 and the third low-impedance transmission line 81, and the other end is grounded and short-circuited; one end of the second terminal short-circuit line 15 is connected to the connection between 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 of the common mode rejection compensation branch is open-circuited.
The filtering characteristics of the differential mode signal are adjusted by adjusting the first asymmetrically-coupled transmission line 6, the second asymmetrically-coupled transmission line 7, the third asymmetrically-coupled transmission line 8 and the fourth asymmetrically-coupled 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 common-mode signal rejection characteristic is adjusted by adjusting the impedance value and the electrical length of the common-mode rejection compensation stub 5.
In order to further describe the balanced ultra-wideband band-pass filter with harmonic suppression provided by the present invention, a specific example implemented on the premise of the technical solution of the present invention is described in detail below, but the protection scope of the present invention is not limited to the following example, and the methods used in the following example are all conventional methods unless otherwise specified.
Specific examples are as follows: the example lists a balanced ultra-wideband band-pass filter with a harmonic suppression function. As shown in FIG. 2, the balanced ultra-wideband band-pass filter with harmonic suppression function according to the present invention excites differential mode signals at a central frequency of 2.6GHzInput port reflection coefficient of ddAA L is-28.5 dB, and differential mode transmission coefficient is ddBA The differential mode transmission relative bandwidth is 108%, the harmonic suppression is better than 20dB in the wide resistance band from 4.28GHz to 12.14GHz, and the out-of-band suppression range of differential mode signals can reach 4.7 times of the central frequency. As shown in fig. 3, the balanced ultra-wideband band-pass filter with harmonic suppression function according to the present invention suppresses common mode transmission | S under the condition of common mode signal excitation ccBA The | is less than-10 dB in the frequency range from 0 to 9.7 GHz. The balanced ultra-wideband band-pass filter with the harmonic suppression function suppresses common-mode noise and realizes the ultra-wideband filtering characteristic and the harmonic suppression function on differential-mode signals.
In summary, the balanced ultra-wideband band-pass filter with the harmonic suppression function of the present invention can effectively suppress common mode noise, simultaneously realize the ultra-wideband filtering characteristic for differential mode signals, and expand the harmonic suppression function of the balanced filter, thereby enhancing the out-of-band suppression characteristic for differential mode signals, and therefore, the balanced ultra-wideband band-pass filter is very suitable for being applied to various balanced microwave systems to improve the overall performance of the system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A balanced ultra-wideband band-pass filter with harmonic suppression function is 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 filter connecting lines, two sections of quarter-wavelength terminal short-circuit lines, four sections of harmonic suppression open-circuit branches and a common-mode suppression compensation branch (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 asymmetrically-coupled transmission lines comprise a first asymmetrically-coupled transmission line (6), a second asymmetrically-coupled transmission line (7), a third asymmetrically-coupled transmission line (8) and a fourth asymmetrically-coupled transmission line (9);
the two sections of quarter-wavelength differential transmission lines comprise 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 sections of quarter-wavelength end short circuits comprise a first end short circuit (14) and a second end short circuit (15);
the four sections of harmonic suppression open-circuit branches comprise 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 is open-circuited; one end of the first high-impedance transmission line (62) is open-circuit, 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 to the joint 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 to the joint 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 line (12) is connected to 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 line is connected with the second filtering connecting line (13); one end of the second filtering connecting line (13) is connected with the joint of the second high-impedance transmission line (72) and the fourth high-impedance transmission line (92), and the other end of the second filtering connecting line is connected with the first filtering connecting 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 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 to the joint of the first differential transmission line (10) and the second differential transmission line (11), and the other end of the common mode rejection compensation branch is open-circuited.
2. The balanced ultra-wideband band-pass filter with harmonic suppression function according to claim 1, characterized in that: the first asymmetrically-coupled transmission line (6), the second asymmetrically-coupled transmission line (7), the third asymmetrically-coupled transmission line (8) and the fourth asymmetrically-coupled transmission line (9) have the same structure.
3. The balanced ultra-wideband band-pass filter with harmonic suppression function of claim 2, characterized in that: the filtering characteristic of the differential mode signal is adjusted by adjusting the first asymmetrically-coupled transmission line (6), the second asymmetrically-coupled transmission line (7), the third asymmetrically-coupled transmission line (8) and the fourth asymmetrically-coupled transmission line (9).
4. The balanced ultra-wideband band-pass filter with harmonic suppression function according to claim 1, wherein: the harmonic suppression characteristics of the differential mode signals 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 suppression function according to claim 1, wherein: the common-mode signal rejection characteristic is adjusted by adjusting the impedance value and the electrical length of the common-mode rejection compensation stub (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116960595A (en) * | 2023-08-15 | 2023-10-27 | 南通大学 | Broadband balanced type filtering directional coupler |
| CN116960595B (en) * | 2023-08-15 | 2024-05-24 | 南通大学 | Broadband balanced type filtering directional coupler |
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| CN116960595B (en) * | 2023-08-15 | 2024-05-24 | 南通大学 | Broadband balanced type filtering directional coupler |
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