Dual-branch loaded L-band broadband high isolation directional coupler

Ma Zhuang; Zhou Dongfang; Zhang Dewei; Zhang Yi; Lü Dalong

doi:10.11884/HPLPB202234.210289

Volume 34 Issue 4

Mar. 2022

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Ma Zhuang, Zhou Dongfang, Zhang Dewei, et al. Dual-branch loaded L-band broadband high isolation directional coupler[J]. High Power Laser and Particle Beams, 2022, 34: 043002. doi: 10.11884/HPLPB202234.210289

Citation:

Ma Zhuang, Zhou Dongfang, Zhang Dewei, et al. Dual-branch loaded L-band broadband high isolation directional coupler[J]. High Power Laser and Particle Beams, 2022, 34: 043002. doi: 10.11884/HPLPB202234.210289

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Dual-branch loaded L-band broadband high isolation directional coupler

doi: 10.11884/HPLPB202234.210289

Information Engineering College, PLA Strategic Support Force Information Engineering University, Zhengzhou 450001, China

Received Date: 2021-07-14
Accepted Date: 2021-12-08
Rev Recd Date: 2021-12-06

Available Online: 2021-12-14

Publish Date: 2022-03-19

Abstract

Abstract

This paper presents a miniaturized L-band microstrip line directional coupler loaded with double branches. Power cancellation technology is used to increase the isolation of the directional coupler, and two loading branches with different lengths are used to reflect signals at two similar frequency points respectively, so as to realize the bandwidth expansion of the coupler; at the same time, the slow wave characteristics of the defective ground structure are used to reduce the physical size of the directional coupler, and the notch generated by the defective ground structure is used to combine the two notch waves generated by the reflection of the two branches to further improve the bandwidth and isolation of the directional coupler. The coupler works in the L-band, the coupling is about 10 dB, the isolation in the entire L-band is better than −20 dB, and the maximum is about −52.81 dB, and the fractional bandwidth is 60%. Finally, the designed directional coupler is processed and tested, and the test and simulation results are in good agreement, which proves the feasibility of the circuit.
- directional coupler,
- isolation degree,
- fractional bandwidth,
- power cancellation,
- defective ground structure

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References(16)

References

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