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Title
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Novel microstrip branch-line coupler with low phase shift for WLANs
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Type
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JournalPaper
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Keywords
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Microstrip, Branch-line coupler, Phase shift , Isolation
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Abstract
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In this work, a novel branch-line coupler is presented using a new type of microstrip cells. The proposed structure is consisting of high and low impedance sections and a main small square closed loops. It operates at 2.4 GHz for WLAN applications. Using the introduced structure, a good passband performance is achieved. An excellent phase balance closed to ideal is obtained with a phase difference of 270 ± 0.037 between output ports. Furthermore, there are low return loss and high isolation better than - 29 and - 30 dB respectively. Meanwhile, the designed coupler has a good insertion loss and coupling factor. Despite of having a high performance, this coupler is relatively compact with an overall size of 0.037 kg2. The designing method is based on proposing an LC model of a basic microstrip cell and finding the effective parameters to obtain a high performance. In order to validate the designing method and simulation results, the presented coupler is fabricated and measured. There is a good agreement between the simulated and measured results.
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Researchers
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Seyed mohammad Hosseini (Third Researcher), leila noori (Second Researcher), Abbas Rezaei (First Researcher)
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