A Novel Ultra-Compact Microstrip Coupler with Low Imbalance Magnitudes and Phases for Wireless Networks
IEEE Access(2024)
摘要
Based on stub loaded meandrous coupled lines, a novel microstrip coupler is designed, fabricated and measured for wireless applications. It is very compact with high performance. The size of this coupler is only 0.0028 λg
2
, where it operates at 875 MHz. The values of S
11
, S
21
, S
31
at the operating frequency are -24.97 dB, -3.058 dB and -3.033 dB respectively. Therefore, the insertion losses are very low and the magnitudes of S
21
and S
31
are well balanced. The phase imbalance at the operating frequency is 0.5°. From 790 MHz up to 1.18 GHz, S
11
is better than -10 dB, the maximum phase imbalance is lower than 4.5° and the maximum magnitude imbalance is lower that ±0.5 dB. Therefore, it has 40% fractional bandwidth (FBW) that covers 0.79 GHz to 1.18 GHz. Its in-band isolation factor is better than -25 dB. The important advantages of this coupler compared to most of the previous designs is having a filtering frequency response and having flat passbands with a maximum group delay of 1 ns.
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关键词
Wireless Networks,Microstrip,Ultra-Compact,Coupler,Suppressed Harmonics,Fractional Bandwidth
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