Balun filter with non-reflective balance port

A balun filter, balanced port technology, applied in the field of balun filter, to achieve the effect of good isolation

Inactive Publication Date: 2020-06-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few literature reports on the reflectionless balun filter in the prior art

Method used

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  • Balun filter with non-reflective balance port
  • Balun filter with non-reflective balance port
  • Balun filter with non-reflective balance port

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 Shown, a kind of balun filter of balance port without reflection, it comprises: first port (1), basic resonant unit (2) / (3), second port (4) and the 3rd port (5);

[0022] With the above technical solution, the signal enters from the first port (1); the second port (4) and the third port (5) are output ports of the signal.

[0023] The first port (1) is connected to the microstrip resonator through a gap coupling structure; the microstrip resonator is connected to the second port (4) and the third port (5). are respectively connected by a gap-coupling structure;

[0024] It also includes: an isolation network (6); the isolation network (6) isolates the second port (4) and the third port (5), and can adjust the second port (4) and the third port (5) by adjusting its own parameters The absorption strength of the third port (5) to the stopband frequency signal enables the second port (4) and the third port (5) to realize wide-band non-reflection when out...

Embodiment 2

[0028] Such as figure 1 Shown, a kind of balun filter of balance port without reflection, it comprises: first port (1), open-circuit microstrip resonator, second port (4) and the 3rd port (5); Said first port (1) and the open-circuit microstrip resonator are connected through a gap coupling structure; the open-circuit microstrip resonator and the second port (4) and the third port (5) are respectively passed through a gap The coupling structure is connected; it also includes: an isolation network (6); the isolation network (6) isolates the second port (4) and the third port (5), and can adjust the second port by adjusting its own parameters (4) and the third port (5) absorb the frequency signal of the stop band so that the second port (4) and the third port (5) realize wide-band reflection-free when outputting signals.

[0029] Using the above technical solution, the microstrip resonator, that is, the microwave resonator, can be composed of a section of transmission line (603...

Embodiment 3

[0035] Such as figure 2 or image 3 As shown, a balanced port reflection-free balun filter, the basic resonant unit (2) / (3) is composed of an open-circuit microstrip resonator, the order of the open-circuit microstrip resonator is 1st order, and the center of the resonator Frequency 2.15GHz.

[0036] Therefore, in the isolation network (6), the transmission line (603) whose equivalent electrical length is λ / 2 is realized by the microstrip line whose length is λ / 2, and its characteristic impedance is 11.5Ω, and the electrical resistance (601) and electrical The resistance values ​​of the two resistors (602) are both 43Ω. The dielectric substrate is Rogers5880, and the thickness of the substrate is 0.508mm. The input and output ports are connected by SMA connectors.

[0037] After design, simulation and optimization, the size of the dual-passband single-ended to differential balun filter network is finally determined as figure 2 As shown, where S1=0.2mm, s2=0.3mm, L1=30mm...

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Abstract

The invention belongs to the technical field of wireless communication systems, and particularly relates to a Balun filter with a non-reflective balance port. The filter comprises a first port, a basic resonance unit, a second port and a third port, wherein the first port and the basic resonance unit are connected through a gap coupling structure. The basic resonance unit is connected with the second port and the third port through gap coupling structures. The Balun filter is characterized in that the Balun filter also comprises an isolation network; the isolation network isolates the second port and the third port, and can adjust the absorption intensity of the second port and the third port to stop-band frequency signals by adjusting the parameters of the isolation network, so that whenthe second port and the third port output signals, broadband non-reflection is realized. According to the invention, the broadband non-reflection performance of the output ports of the circuit is realized, and the two output ports have good isolation at the center frequency of the passband.

Description

technical field [0001] The invention belongs to the technical field of wireless communication systems, and in particular relates to a balun filter with no reflection on a balanced port. Background technique [0002] Baluns and filters are passive circuits commonly used in modern wireless communication networks. As a single-ended to balanced converter, the balun is widely used in balanced circuits; the balun filter with integrated filtering function is widely used in radio frequency transceivers. However, the traditional balun filter reflects the stopband frequency signal back to the single-ended or balanced end, which may have a serious impact on its front-end devices, such as causing gain fluctuations in the front-end power amplifier or intermodulation interference in the front-end mixer. Designing a single-ended or balanced port reflection-free balun filter is an important means to solve this problem. [0003] The patent No.: CN201410766682.7 describes a balun filter and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/20H01P5/12
CPCH01P1/20H01P5/12
Inventor 杨涛陈雄
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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