CN117374536A - Balanced/unbalanced microstrip cross device with band-pass filtering function - Google Patents
Balanced/unbalanced microstrip cross device with band-pass filtering function Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
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Abstract
The invention discloses a balanced/unbalanced microstrip cross device with a band-pass filtering function, which comprises: balance end differential signal input port A, balance end differential signal output port B, unbalanced end signal input port C, unbalanced end signal output port D, two half-wavelength differential inverse phase lines, four-wavelength impedance match line, two quarter-wavelength parallel coupling line, one half-wavelength microstrip connection line, four-wavelength microstrip transmission line, two quarter-wavelength coupling three-line and four half-wavelength microstrip branch line. Besides the function of suppressing common mode noise of the balanced end, the microstrip cross device can realize the cross transmission of two paths of signals of the balanced end and the unbalanced end with high isolation, and can realize the band-pass filtering function of the signals at the balanced end and the unbalanced end at the same time.
Description
Technical Field
The invention relates to a microstrip cross device, in particular to a balanced/unbalanced microstrip cross device with a band-pass filtering function.
Background
In modern wireless communication systems, balancing circuits play an important role. Compared with an unbalanced single-port input/output circuit, the balanced circuit can efficiently suppress environmental noise and noise generated by an internal active device, and thus has excellent electromagnetic compatibility characteristics. More and more rf microwave devices, such as filters, mixers and power amplifiers, are designed in balanced topologies. With the rapid development of integrated circuits, the need for balanced devices is more stringent, while for systems having both balanced and unbalanced ports, balanced/unbalanced interleavers with simultaneous cross-connection of balanced and unbalanced circuits are required.
In rf front-end circuits, filters and interleavers are often used simultaneously, and for single-ended interleavers, a cascaded filter structure is a simple and efficient method, but increases the size of the circuit and mismatch losses. Obviously, the use of conventional single function devices can result in a larger system and increased cost. In recent years, therefore, filter interleavers have received a great deal of attention in many communication systems. The filter interleaver not only can cross-transmit two signals and maintain high isolation, but also can realize frequency selection characteristics, so that the filter interleaver is widely applied. However, most of the research on the filter cross-over device still stays in single-ended microwave devices at present, the function of cross-connecting balanced and unbalanced circuits at the same time cannot be realized, and the problems of poor filter selectivity, poor cross isolation and the like exist. In view of this, it is necessary to propose a balanced/unbalanced microstrip interleaver with a bandpass filtering function.
Disclosure of Invention
Based on the above, in order to solve the defects existing in the prior art, a balanced/unbalanced microstrip cross device with a band-pass filtering function is specifically provided.
Based on the above object, the technical scheme of the present invention includes: a balanced-end differential signal input port A, a balanced-end differential signal output port B, an unbalanced-end signal input port C, an unbalanced-end signal output port D, two half-wavelength differential inverse phases, a quarter-wavelength impedance match line, two quarter-wavelength parallel coupling lines, a half-wavelength microstrip connection line, a quarter-wavelength microstrip transmission line, two quarter-wavelength coupling three lines and a quarter-wavelength microstrip branch line;
the balance end differential signal input port A comprises an input port A+ and an input port A-;
the balance end differential signal output port B comprises an output port B+ and an output port B-;
the two sections of half-wavelength differential inversion lines comprise a first differential inversion line and a second differential inversion line; one end of the first differential phase inversion line is connected with the input port A+, and the other end of the first differential phase inversion line is connected with the input port A-; one end of the second differential phase-reversing line is connected with the output port B+ and the other end of the second differential phase-reversing line is connected with the output port B-;
the four segments of quarter wave impedance match lines include a first impedance match line, a second impedance match line, a third impedance match line, and a fourth impedance match line; one end of the first impedance matching line is connected to the connection part of the input port A+ and the first differential phase reversal line, and the other end of the first impedance matching line is connected to the connection part of the f+ port of the first parallel coupling line and the first microstrip transmission line; one end of the second impedance matching line is connected with the connection part of the input port A-and the first differential phase reversal line, and the other end of the second impedance matching line is connected with the connection part of the f+ port of the second parallel coupling line and the second microstrip transmission line; one end of the third impedance matching line is connected to the connection part of the output port B+ and the second differential phase reversal line, and the other end of the third impedance matching line is connected to the connection part of the g+ port of the first parallel coupling line and the third microstrip transmission line; one end of the fourth impedance matching line is connected to the connection part of the output port B-and the second differential phase reversal line, and the other end of the fourth impedance matching line is connected to the connection part of the g+ port of the second parallel coupling line and the fourth microstrip transmission line;
the two sections of quarter-wavelength parallel coupled lines comprise a first parallel coupled line and a second parallel coupled line; the f+ port of the first parallel coupling line is connected to the connection part of the first impedance matching line and the first microstrip transmission line, the f-port and the g-port of the first parallel coupling line are connected with the half-wavelength microstrip connection line, and the g+ port of the first parallel coupling line is connected to the connection part of the third impedance matching line and the third microstrip transmission line; the f+ port of the second parallel coupling line is connected to the connection part of the second impedance matching line and the second microstrip transmission line, the f-port and the g-port of the second parallel coupling line are connected with the half-wavelength microstrip connection line, and the g+ port of the second parallel coupling line is connected to the connection part of the fourth impedance matching line and the fourth microstrip transmission line;
the four-section quarter-wavelength microstrip transmission line comprises a first microstrip transmission line, a second microstrip transmission line, a third microstrip transmission line and a fourth microstrip transmission line; one end of the first microstrip transmission line is connected to the connection part of the f+ port of the first parallel coupling line and the first impedance matching line, and the other end of the first microstrip transmission line is connected with the a-port of the first coupling three line; one end of the second microstrip transmission line is connected to the connection part of the f+ port of the second parallel coupling line and the second impedance matching line, and the other end of the second microstrip transmission line is connected with the a-port of the second coupling three-wire; one end of the third microstrip transmission line is connected to the joint of the g+ port of the first parallel coupling line and the third impedance matching line, and the other end of the third microstrip transmission line is connected with the c-port of the first coupling three-wire; one end of the fourth microstrip transmission line is connected to the joint of the g+ port of the second parallel coupling line and the fourth impedance matching line, and the other end of the fourth microstrip transmission line is connected with the c-port of the second coupling three-wire;
the two quarter-wavelength coupled three lines comprise a first coupled three line and a second coupled three line; the a+ port of the first coupling three wire is connected with the first microstrip branch line, the a-port of the first coupling three wire is connected with the first microstrip transmission line, the b+ port of the first coupling three wire is connected with the unbalanced end signal input port C, the b-port of the first coupling three wire is an open end, the c+ port of the first coupling three wire is connected with the third microstrip branch line, and the C-port of the first coupling three wire is connected with the third microstrip transmission line; the a+ port of the second coupling three wire is connected with the second microstrip branch line, the a-port of the second coupling three wire is connected with the second microstrip transmission line, the b+ port of the second coupling three wire is connected with the unbalanced end signal output port D, the b-port of the second coupling three wire is an open end, the c+ port of the second coupling three wire is connected with the fourth microstrip branch line, and the c-port of the second coupling three wire is connected with the fourth microstrip transmission line;
the four-section half-wavelength microstrip branch line comprises a first microstrip branch line, a second microstrip branch line, a third microstrip branch line and a fourth microstrip branch line; one end of the first microstrip branch line is connected with an a+ port of the first coupling three-wire, and the other end of the first microstrip branch line is open; one end of the second microstrip branch line is connected with an a+ port of the second coupling three-wire, and the other end of the second microstrip branch line is open; one end of the third microstrip branch line is connected with the c+ port of the first coupling three-wire, and the other end of the third microstrip branch line is open; one end of the fourth microstrip branch line is connected with the c+ port of the second coupling three-wire, and the other end of the fourth microstrip branch line is open.
Further, the common mode rejection characteristics of the balanced terminals are adjusted by adjusting the first differential phase inversion line and the second differential phase inversion line.
Further, the in-band matching characteristics of the balanced terminal are adjusted by adjusting the first impedance match line, the second impedance match line, the third impedance match line, and the fourth impedance match line.
Further, the passband bandwidth of the unbalanced terminal is adjusted by adjusting the first coupling three-wire and the second coupling three-wire.
Further, the out-of-band transmission zero position and the filtering selection characteristic of the unbalanced end are adjusted by adjusting the first microstrip branch line, the second microstrip branch line, the third microstrip branch line and the fourth microstrip branch line.
Compared with the prior art, the invention has the beneficial effects that:
in order to realize the functions of balanced and unbalanced two-path signal cross transmission and expand the filter characteristic of the cross device, the invention provides a balanced/unbalanced microstrip cross device with a band-pass filter function. Besides the function of suppressing common mode noise of the balanced end, the microstrip cross device can realize the cross transmission of two paths of signals of the balanced end and the unbalanced end with high isolation, and can realize the band-pass filtering function of the signals at the balanced end and the unbalanced end at the same time.
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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 balun with bandpass filtering function according to the present invention;
fig. 2 is a graph of the magnitude of a hybrid S-parameter of a balun with bandpass filtering.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention relates to a balanced/unbalanced microstrip cross device with a band-pass filtering function, which is characterized by comprising: a balanced-end differential signal input port a, a balanced-end differential signal output port B, an unbalanced-end signal input port C5, an unbalanced-end signal output port D6, two half-wavelength differential inverse phases, a quarter-wavelength impedance match line, two quarter-wavelength parallel coupling lines, a half-wavelength microstrip connection line 15, a quarter-wavelength microstrip transmission line, two quarter-wavelength coupling three lines and a quarter-wavelength microstrip branch line;
the balance end differential signal input port A comprises an input port A+1 and an input port A-2;
the balance end differential signal output port B comprises an output port B+3 and an output port B-4;
the two-section half-wavelength differential inversion line comprises a first differential inversion line 7 and a second differential inversion line 8; one end of the first differential phase reversal line 7 is connected with an input port A+1, and the other end of the first differential phase reversal line is connected with an input port A-2; one end of the second differential phase reversal line 8 is connected with an output port B+3, and the other end of the second differential phase reversal line is connected with an output port B-4;
the four-segment quarter wave impedance match line comprises a first impedance match line 9, a second impedance match line 10, a third impedance match line 11 and a fourth impedance match line 12; one end of the first impedance matching line 9 is connected to the connection between the input port a+1 and the first differential phase reversal line 7, and the other end is connected to the connection between the f+port 1f+ of the first parallel coupling line 13 and the first microstrip transmission line 16; one end of the second impedance matching line 10 is connected to the connection between the input port a-2 and the first differential phase reversal line 7, and the other end is connected to the connection between the f+port 2f+ of the second parallel coupling line 14 and the second microstrip transmission line 17; one end of the third impedance matching line 11 is connected to the connection between the output port b+3 and the second differential phase reversal line 8, and the other end is connected to the connection between the g+port 1g+ of the first parallel coupling line 13 and the third microstrip transmission line 18; one end of the fourth impedance matching line 12 is connected to the connection between the output port B-4 and the second differential phase reversal line 8, and the other end is connected to the connection between the g+ port 2g+ of the second parallel coupling line 14 and the fourth microstrip transmission line 19;
the two sections of quarter-wavelength parallel coupled lines comprise a first parallel coupled line 13 and a second parallel coupled line 14; wherein the f+ port 1f+ of the first parallel coupling line 13 is connected to the connection between the first impedance matching line 9 and the first microstrip transmission line 16, the f-port 1 f-and the g-port 1 g-of the first parallel coupling line 13 are connected to the half-wavelength microstrip connection line 15, and the g+ port 1g+ of the first parallel coupling line 13 is connected to the connection between the third impedance matching line 11 and the third microstrip transmission line 18; the f+ port 2f+ of the second parallel coupling line 14 is connected to the connection between the second impedance matching line 10 and the second microstrip transmission line 17, the f-port 2 f-and the g-port 2 g-of the second parallel coupling line 14 are connected to the half-wavelength microstrip connection line 15, and the g+ port 2g+ of the second parallel coupling line 14 is connected to the connection between the fourth impedance matching line 12 and the fourth microstrip transmission line 19;
the four-section quarter-wavelength microstrip transmission line comprises a first microstrip transmission line 16, a second microstrip transmission line 17, a third microstrip transmission line 18 and a fourth microstrip transmission line 19; wherein one end of the first microstrip transmission line 16 is connected with the connection part of the f+ port 1f+ of the first parallel coupling line 13 and the first impedance matching line 9, and the other end of the first microstrip transmission line is connected with the a-port 1 a-of the first coupling three line 20; one end of the second microstrip transmission line 17 is connected to the connection part of the f+ port 2f+ of the second parallel coupling line 14 and the second impedance matching line 10, and the other end is connected to the a-port 2 a-of the second coupling three-wire 21; one end of the third microstrip transmission line 18 is connected with the junction of the g+ port 1g+ of the first parallel coupling line 13 and the third impedance matching line 11, and the other end of the third microstrip transmission line is connected with the c-port 1 c-of the first coupling three line 20; one end of the fourth microstrip transmission line 19 is connected to the connection part of the g+ port 2g+ of the second parallel coupling line 14 and the fourth impedance matching line 12, and the other end is connected to the c-port 2 c-of the second coupling three-wire 21;
the two-segment quarter-wavelength coupled three-wire includes a first coupled three-wire 20 and a second coupled three-wire 21; wherein the a+ port 1a+ of the first coupling three wire 20 is connected to the first microstrip branch line 22, the a-port 1a-of the first coupling three wire 20 is connected to the first microstrip transmission line 16, the b+ port 1b+ of the first coupling three wire 20 is connected to the unbalanced terminal signal input port C5, the b-port 1b-of the first coupling three wire 20 is an open terminal, the c+ port 1c+ of the first coupling three wire 20 is connected to the third microstrip branch line 24, and the C-port 1c-of the first coupling three wire 20 is connected to the third microstrip transmission line 18; the a+ port 2a+ of the second coupling three wire 21 is connected to the second microstrip branch line 23, the a-port 2a-of the second coupling three wire 21 is connected to the second microstrip transmission line 17, the b+ port 2b+ of the second coupling three wire 21 is connected to the unbalanced terminal signal output port D6, the b-port 2b-of the second coupling three wire 21 is an open terminal, the c+ port 2c+ of the second coupling three wire 21 is connected to the fourth microstrip branch line 25, and the c-port 2c-of the second coupling three wire 21 is connected to the fourth microstrip transmission line 19;
the four-section half-wavelength microstrip branch line comprises a first microstrip branch line 22, a second microstrip branch line 23, a third microstrip branch line 24 and a fourth microstrip branch line 25; wherein one end of the first microstrip branch line 22 is connected with the a+ port 1a+ of the first coupling three line 20, and the other end is open; one end of the second microstrip branch line 23 is connected with an a+port 2a+ of the second coupling three-wire 21, and the other end is open; one end of the third microstrip branch line 24 is connected with the c+ port 1c+ of the first coupling three line 20, and the other end is open; one end of the fourth microstrip branch line 25 is connected to the c+ port 2c+ of the second coupling three-wire 21, and the other end is open.
The common mode rejection characteristics of the balanced terminals are adjusted by adjusting the first differential phase-reversal line 7 and the second differential phase-reversal line 8.
The in-band matching characteristics of the balanced terminals are adjusted by adjusting the first impedance matching line 9, the second impedance matching line 10, the third impedance matching line 11, and the fourth impedance matching line 12.
The passband bandwidth of the unbalanced terminal is adjusted by adjusting the first coupling three wire 20 and the second coupling three wire 21.
The out-of-band transmission zero point position and the filter selection characteristic of the unbalanced terminal are adjusted by adjusting the first microstrip branch line 22, the second microstrip branch line 23, the third microstrip branch line 24, and the fourth microstrip branch line 25.
In order to further describe the balanced/unbalanced microstrip interleaver with the bandpass filtering function provided by the present invention, the following specific examples are described in detail on the premise of the technical scheme of the present invention, but the protection scope of the present 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/unbalanced microstrip interleaver with bandpass filtering. As shown in fig. 2 (a), a balanced/unbalanced microstrip interleaver with bandpass filtering function according to the present invention is excited by differential mode signalsThe balance end input/output port reflection coefficient |S ddAA I and S ddBB Equal, balanced input/output port reflection coefficient S at center frequency 2.45GHz ddAA I and S ddBB I is-39.2 dB; balance end input/output port differential mode transmission loss |S of cross device under differential mode signal excitation ddBA I and S ddAB Equal, minimum differential mode transmission loss in passband |s ddBA I and S ddAB The I is-0.01 dB, and the 3dB transmission relative bandwidth of the balance end is 24.5%; transmission zeros were introduced at both frequencies of 1.86GHz and 3.07GHz, respectively. As shown in fig. 2 (b), the balanced-end input-output port common-mode rejection |s of the balanced/unbalanced microstrip interleaver with bandpass filtering function of the present invention ccBA I and S ccAB I is equal, and common mode rejection of balanced-end input/output ports is equal within the frequency range of 1.85-3.06 GHz ccBA I and S ccAB The I is smaller than-40 dB. As shown in FIG. 2 (c), the unbalanced-end input/output port reflection coefficient |S of the balanced/unbalanced microstrip interleaver with the band-pass filtering function of the present invention CC I and S DD Equal, unbalanced input/output port reflection coefficient S at center frequency 2.45GHz CC I and S DD I is-25.3 dB; unbalanced-end input-output port transmission loss |S of cross device CD I and S DC Equal, minimum transmission loss in passband |s CD I and S DC The I is-0.01 dB, and the 3dB transmission relative bandwidth of the unbalanced end is 31.1%; transmission zeroes were introduced at the two frequencies of 1.69GHz and 3.20GHz, respectively. As shown in FIG. 2 (d), the balanced/unbalanced microstrip cross device with the band-pass filtering function has the transmission isolation S from the balanced end to the unbalanced end under the excitation of differential mode signals in the frequency range of 1.60-3.20 GHz sdCA |＝|S sdCB |＝|S sdDA |＝|S sdDB I and are all less than-11.5 dB; transmission isolation S from balanced end to unbalanced end of the crossover under common mode signal excitation in the frequency range of 1.60-3.20 GHz scCA |＝|S scCB |＝|S scDA |＝|S scDB I and are all less than-25.6 dB. This shows that the balanced/unbalanced microstrip with the band-pass filtering functionThe cross device not only can make the two paths of signals of the balance end and the unbalance end cross and transmit and keep high isolation, but also can realize the frequency selection characteristic.
In summary, the balanced/unbalanced microstrip cross device with the band-pass filtering function not only can realize the cross transmission of two paths of signals of a balanced end and an unbalanced end with high isolation, but also can realize the band-pass filtering function at the balanced end and the unbalanced end at the same time, so that the balanced/unbalanced microstrip cross device with the band-pass filtering function is very suitable for being applied to various microwave systems with balanced ports and unbalanced ports at the same time so as 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/unbalanced microstrip interleaver having a bandpass filtering function, comprising: a balanced-end differential signal input port A, a balanced-end differential signal output port B, an unbalanced-end signal input port C (5), an unbalanced-end signal output port D (6), two half-wavelength differential inverse phases, a quarter-wavelength impedance matching line, two quarter-wavelength parallel coupling lines, a half-wavelength microstrip connecting line (15), a quarter-wavelength microstrip transmission line, two quarter-wavelength coupling three lines and a quarter-wavelength microstrip branch line;
the balance end differential signal input port A comprises an input port A+ (1) and an input port A- (2);
the balance end differential signal output port B comprises an output port B+ (3) and an output port B- (4);
the two-section half-wavelength differential inversion line comprises a first differential inversion line (7) and a second differential inversion line (8); one end of the first differential phase reversal line (7) is connected with the input port A+ (1), and the other end of the first differential phase reversal line is connected with the input port A- (2); one end of the second differential phase reversal line (8) is connected with the output port B+ (3), and the other end of the second differential phase reversal line is connected with the output port B- (4);
the four-segment quarter wave impedance match line comprises a first impedance match line (9), a second impedance match line (10), a third impedance match line (11) and a fourth impedance match line (12); one end of the first impedance matching line (9) is connected to the connection part of the input port A+ (1) and the first differential phase reversal line (7), and the other end of the first impedance matching line is connected to the connection part of the f+ port (1 f+) of the first parallel coupling line (13) and the first microstrip transmission line (16); one end of the second impedance matching line (10) is connected with the connection part of the input port A- (2) and the first differential phase reversal line (7), and the other end of the second impedance matching line is connected with the connection part of the f+ port (2f+) of the second parallel coupling line (14) and the second microstrip transmission line (17); one end of the third impedance matching line (11) is connected to the connection part of the output port B+ (3) and the second differential phase reversal line (8), and the other end of the third impedance matching line is connected to the connection part of the g+ port (1 g+) of the first parallel coupling line (13) and the third microstrip transmission line (18); one end of the fourth impedance matching line (12) is connected to the connection part of the output port B- (4) and the second differential phase reversal line (8), and the other end of the fourth impedance matching line is connected to the connection part of the g+ port (2g+) of the second parallel coupling line (14) and the fourth microstrip transmission line (19);
the two sections of quarter-wavelength parallel coupled lines comprise a first parallel coupled line (13) and a second parallel coupled line (14); the f+ port (1 f+) of the first parallel coupling line (13) is connected to the connection part of the first impedance matching line (9) and the first microstrip transmission line (16), the f-port (1 f-) and the g-port (1 g-) of the first parallel coupling line (13) are connected to the half-wavelength microstrip connection line (15), and the g+ port (1 g+) of the first parallel coupling line (13) is connected to the connection part of the third impedance matching line (11) and the third microstrip transmission line (18); the f+ port (2f+) of the second parallel coupling line (14) is connected to the connection part of the second impedance matching line (10) and the second microstrip transmission line (17), the f-port (2f-) and the g-port (2g-) of the second parallel coupling line (14) are connected to the half-wavelength microstrip connection line (15), and the g+ port (2g+) of the second parallel coupling line (14) is connected to the connection part of the fourth impedance matching line (12) and the fourth microstrip transmission line (19);
the four-section quarter-wavelength microstrip transmission line comprises a first microstrip transmission line (16), a second microstrip transmission line (17), a third microstrip transmission line (18) and a fourth microstrip transmission line (19); one end of the first microstrip transmission line (16) is connected to the connection part of the f+ port (1f+) of the first parallel coupling line (13) and the first impedance matching line (9), and the other end of the first microstrip transmission line is connected with the a-port (1 a-) of the first coupling three line (20); one end of the second microstrip transmission line (17) is connected to the connection part of the f+ port (2f+) of the second parallel coupling line (14) and the second impedance matching line (10), and the other end of the second microstrip transmission line is connected with the a-port (2 a-) of the second coupling three line (21); one end of the third microstrip transmission line (18) is connected to the joint of the g+ port (1g+) of the first parallel coupling line (13) and the third impedance matching line (11), and the other end of the third microstrip transmission line is connected with the c-port (1 c-) of the first coupling three line (20); one end of the fourth microstrip transmission line (19) is connected to the connection part of the g+ port (2g+) of the second parallel coupling line (14) and the fourth impedance matching line (12), and the other end of the fourth microstrip transmission line is connected with the c-port (2 c-) of the second coupling three line (21);
the two-section quarter-wavelength coupled three-wire comprises a first coupled three-wire (20) and a second coupled three-wire (21); the a+ port (1a+) of the first coupling three wire (20) is connected with the first microstrip branch line (22), the a-port (1a-) of the first coupling three wire (20) is connected with the first microstrip transmission line (16), the b+ port (1b+) of the first coupling three wire (20) is connected with the unbalanced terminal signal input port C (5), the b-port (1b-) of the first coupling three wire (20) is an open-circuit terminal, the c+ port (1c+) of the first coupling three wire (20) is connected with the third microstrip branch line (24), and the C-port (1c-) of the first coupling three wire (20) is connected with the third microstrip transmission line (18); the a+ port (2a+) of the second coupling three wire (21) is connected with a second microstrip branch wire (23), the a-port (2a-) of the second coupling three wire (21) is connected with a second microstrip transmission wire (17), the b+ port (2b+) of the second coupling three wire (21) is connected with an unbalanced terminal signal output port D (6), the b-port (2b-) of the second coupling three wire (21) is an open-circuit terminal, the c+ port (2c+) of the second coupling three wire (21) is connected with a fourth microstrip branch wire (25), and the c-port (2c-) of the second coupling three wire (21) is connected with a fourth microstrip transmission wire (19);
the four-section half-wavelength microstrip branch line comprises a first microstrip branch line (22), a second microstrip branch line (23), a third microstrip branch line (24) and a fourth microstrip branch line (25); one end of the first microstrip branch line (22) is connected with an a+ port (1a+) of the first coupling three-wire (20), and the other end of the first microstrip branch line is open; one end of the second microstrip branch line (23) is connected with an a+ port (2a+) of the second coupling three-wire (21), and the other end of the second microstrip branch line is open; one end of the third microstrip branch line (24) is connected with a c+ port (1c+) of the first coupling three-wire (20), and the other end of the third microstrip branch line is open; one end of the fourth microstrip branch line (25) is connected with the c+ port (2c+) of the second coupling three-wire (21), and the other end is open-circuited.
2. A balanced/unbalanced microstrip interleaver with bandpass filtering function according to claim 1, wherein: the common mode rejection characteristics of the balanced terminals are adjusted by adjusting the first differential phase-reversing line (7) and the second differential phase-reversing line (8).
3. A balanced/unbalanced microstrip interleaver with bandpass filtering function according to claim 1, wherein: the in-band matching characteristics of the balanced ends are adjusted by adjusting the first impedance matching line (9), the second impedance matching line (10), the third impedance matching line (11) and the fourth impedance matching line (12).
4. A balanced/unbalanced microstrip interleaver with bandpass filtering function according to claim 1, wherein: the passband bandwidth of the unbalanced terminal is adjusted by adjusting the first coupling three wire (20) and the second coupling three wire (21).
5. A balanced/unbalanced microstrip interleaver with bandpass filtering function according to claim 1, wherein: the out-of-band transmission zero position and the filtering selection characteristic of the unbalanced end are adjusted by adjusting the first microstrip branch line (22), the second microstrip branch line (23), the third microstrip branch line (24) and the fourth microstrip branch line (25).
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| CN202311081443.3A CN117374536A (en) | 2023-08-25 | 2023-08-25 | Balanced/unbalanced microstrip cross device with band-pass filtering function |
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| CN202311081443.3A CN117374536A (en) | 2023-08-25 | 2023-08-25 | Balanced/unbalanced microstrip cross device with band-pass filtering function |
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