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An L ‐band 90° hybrid‐coupled phase shifter using UHF band p‐i‐n diodes
Author(s) -
Karmakar Nemai C.,
Bialkowski Marek E.
Publication year - 1999
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/(sici)1098-2760(19990405)21:1<51::aid-mop15>3.0.co;2-h
Subject(s) - phase shift module , diode , capacitance , microwave , ultra high frequency , electrical engineering , optoelectronics , insertion loss , materials science , pin diode , phase (matter) , engineering , electronic engineering , physics , telecommunications , electrode , quantum mechanics
Abstract The design, development, and testing of a low‐cost L ‐band hybrid‐coupled 90° phase shifter are presented. The developed phase shifter uses a compact branch line coupler to minimize its size, and employs low‐cost UHF band p‐i‐n switching diodes to minimize its production cost. The diodes in a stand‐alone configuration feature large stray capacitance, which make them a poor‐quality open circuit in the reverse‐bias state. An LC compensation technique is applied to tune out this capacitance and make the diodes applicable to L ‐band. The developed phase shifter exhibits less than 1.0 dB insertion loss, more than 15 dB RL, and ±8° phase deviation over 225 MHz centered at 1.6 GHz. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 51–54, 1999.