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A dual frequency branch line coupler

A branch line and coupler technology, applied in the field of radio frequency and microwave, can solve the problems that the coupler is difficult to miniaturize, the frequency ratio adjustment range is wide, and cannot be realized in engineering, and achieves a large frequency ratio adjustment range, broad application prospects, and easy The effect of processing

Active Publication Date: 2020-01-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at higher frequency ratios, the coupler is difficult to miniaturize
[0007] Among the reported design methods of dual-frequency branch line couplers, there are solutions such as loading lumped elements, using coupled line structures, or using theoretically feasible high-impedance lines, but these solutions either have high losses, are not conducive to processing, or even cannot Engineering realization
At present, there are few dual-band branch line couplers that simultaneously achieve the characteristics of small size, low loss, and wide frequency ratio adjustment range.

Method used

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  • A dual frequency branch line coupler
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  • A dual frequency branch line coupler

Examples

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Embodiment 1

[0041] The topological structure diagram of the dual-frequency branch line coupler at 1GHz and 8GHz based on the central operating frequency realized by the present invention is as follows figure 1 As shown, the amplitude unbalance between the direct port 2 and the coupled port 3 is ±0.5dB; the phase difference between the two outputs of the coupled port 3 and the direct port 2 ∠31-∠21 is 90°±2.5° at 1GHz, and 90°±2.5° at 8GHz -90°±2.5°; port return loss greater than 15dB; isolation between through port 2 and coupled port 3 greater than 15dB. The specific design parameters are: the characteristic impedance of the two pairs of series microstrip lines corresponding to the first pair of transmission lines 11 and the second pair of transmission lines 12 is 73Ω, the characteristic impedance of the two pairs of series microstrip lines corresponding to the third pair of transmission lines 13 and the fourth pair of transmission lines 14 The characteristic impedance is 103Ω, the charac...

Embodiment 2

[0043] Based on the dual-frequency branch line coupler with a central operating frequency of 2.4GHz and 5.2GHz realized by the present invention, the unbalance degree of insertion loss between the through port and the coupled port is 0.5dB; the phase difference between the two outputs of the coupled port and the through port It is 90°±2.5° at 2.4GHz, and -90°±2.5° at 5.2GHz; port return loss is greater than 15dB; the isolation between input port and isolation port is greater than 15dB. In this embodiment, a microstrip transmission line is used, the relative permittivity of the dielectric substrate is 2.65, and the thickness of the dielectric plate is 1mm. Its topology is as follows Figure 5 As shown, the specific parameters of each part are as follows:

[0044] S1 is the input and output port transmission line with a characteristic impedance of 50 ohms, the corresponding microstrip line width is 2.71mm, and the length is 4mm;

[0045] S2 is a transmission line with a charact...

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Abstract

The invention discloses a dual-frequency branch line coupler with a wide frequency ratio, which belongs to the technical field of radio frequency and microwave. The invention realizes dual-frequency function by loading open-circuit / short-circuit branches in the middle of the four coupling arms of the traditional branch line coupler, and realizes a wider adjustment range of frequency ratio by loading the branches at the four ports of the coupler. The coupler can achieve ideal matching of ports at two different frequencies and ideal isolation between ports, and quadrature outputs at two frequency bands. The dual-frequency branch line coupler has the advantages of low loss, simple design process, and wide frequency ratio adjustment range. The invention can be used in the feeding network of the array antenna, the balanced amplifier and other microwave circuits and systems.

Description

technical field [0001] The invention relates to the field of radio frequency microwaves, in particular to a dual-frequency branch line coupler with a wide frequency ratio. Background technique [0002] The 3dB branch line coupler is a basic device in microwave engineering. Because of its simple structure, it can convert the input signal into two equal-amplitude, orthogonal output signals and can achieve good isolation characteristics. It is widely used in microwave circuits and systems. With the rapid development of wireless communication, communication systems operate on different communication standards and different frequency bands. For example, China Mobile's GSM uplink operates at 890MHz-909MHz, and TD-LTE operates at 2300MHz-2400MHz. Therefore, it works in dual-band Even multi-band 3dB branch line couplers have aroused extensive research. [0003] Literature "Anovel approach to the design and implementation of dual-bandcompact planar 90branch-line coupler[J]. IEEE Tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P5/12H01P5/18
CPCH01P5/12H01P5/184
Inventor 李家林刘鹏张一明王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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