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Novel branch line balun

A branch line, a new type of technology, applied in the field of communication, can solve the problems of small passband bandwidth and poor isolation.

Inactive Publication Date: 2020-04-17
成都蓝大科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a new type of branch line balun, which solves the problems of small passband bandwidth and poor isolation of the planar branch line balun by improving the circuit structure

Method used

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Embodiment Construction

[0020] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 As shown, a new branch line balun includes a balanced terminal 1, an unbalanced terminal 2, an isolated terminal 3 and a transmission line 5, and the balanced terminal 1 is electrically connected to the unbalanced terminal 2 through the transmission line 5, wherein, An impedance matching unit is provided on the balanced terminal 1 , and a load resistor 31 is provided on the isolated terminal 3 . Wherein, the transmission line 4 includes a plurality of characteristic impedances as The resonant transmission line, Z 0 is 50Ω. Specifically, θ of the resonant transmission line is the electrical length corresponding to the center frequency, which is 90 degrees, that is, a phase shift of 90 degrees wi...

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Abstract

The invention discloses a novel branch line balun. The novel branch line balun comprises a balance end 1, an unbalance end 2, an isolation end 3 and a transmission line 5, and the balance end 1 is electrically connected with the unbalance end 2 through the transmission line 5, an impedance matching unit is arranged on the balance end 1, and a load resistor 31 is arranged on the isolation end 3. According to the invention, the impedance matching unit is arranged at the balance end 1 to carry out standing wave matching, so that signals of the first balance end 11 and the second balance end 12 are ensured to have a relatively stable phase difference in a large input frequency range, the circuit is ensured to have stable insertion loss in a large input frequency range, and the problem that thepassband bandwidth of a traditional planar branch line balun is small is solved. The load resistor 31 is arranged on the isolation end 3, so that the even-mode impedance of the balun in an even-modestate is improved, and the problem that the isolation degree of the balance end of the balun of the traditional planar branch line is relatively poor is solved.

Description

technical field [0001] The invention relates to the communication field, in particular to a novel branch line balun. Background technique [0002] Balun is a converter of balanced and unbalanced signals, and also has the function of impedance transformation. Specifically, the balun is a three-port network, broadly speaking, it consists of three parts: an unbalanced port, a pair of balanced ports and an isolated end. The working characteristic of the balun is to output equal-amplitude and anti-phase signals from two balanced ports. This characteristic makes it have good phase balance, amplitude balance and power equalization. Typical balun structures include branch line baluns, Marchand baluns, and Wilkinson power divider baluns. [0003] At present, the planar branch line balun is limited by the PCB processing technology, and there are problems of small passband bandwidth and poor isolation. Contents of the invention [0004] In view of this, the present invention provi...

Claims

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Application Information

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IPC IPC(8): H01P5/10H01P5/16
CPCH01P5/10H01P5/16
Inventor 张三祥
Owner 成都蓝大科技有限公司
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