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Design of a tri‐band 180‐degree directional coupler with spurious suppression based on extended pi‐shaped microstrip line
Author(s) -
Barik Rusan Kumar,
Krishna Idury Satya,
Karthikeyan S. S.
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31213
Subject(s) - spurious relationship , microstrip , hybrid coupler , rat race coupler , microwave , electronic engineering , magic tee , bandwidth (computing) , frequency band , power dividers and directional couplers , amplitude , physics , topology (electrical circuits) , engineering , electrical engineering , computer science , telecommunications , optics , machine learning
In this article, a tri‐band 180‐degree directional coupler with spurious suppression is proposed. This coupler is realized using the extended π‐shaped Microstrip operating at 3 different frequencies. The design equations of the extended π‐shaped structure are obtained through the ABCD matrix method. The designed coupler provides tri‐frequency response at 1.8, 3.5, and 5.2 GHz corresponding to Global System for Mobile communication, Worldwide Interoperability for Microwave Access, and wireless local area network applications, respectively. The fractional bandwidth variations of the isolation, matching, phase and amplitude imbalance at sum and difference ports are discussed in detail. In addition, the spurious bands beyond the operating frequencies are also suppressed. To validate the performances, the proposed tri‐band coupler is fabricated and tested.