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Theory and design of a tunable Quasi‐Lumped Quadrature Coupler
Author(s) -
Ferrero Fabien,
Luxey Cyril,
Staraj Robert,
Jacquemod Gilles,
Yedlin Matthew,
Fusco Vincent
Publication year - 2009
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.24526
Subject(s) - varicap , hybrid coupler , capacitor , microwave , quadrature (astronomy) , topology (electrical circuits) , diode , electrical engineering , optoelectronics , electronic engineering , materials science , engineering , physics , capacitance , power dividers and directional couplers , telecommunications , voltage , electrode , quantum mechanics
In this article, we present the theory and a design methodology for a tunable Quasi‐Lumped Quadrature Coupler (QLQC). Because of its topology, the coupler is simply reconfigured by switching the bias of two varactor diodes via a very simple DC bias circuitry. No additional capacitors or inductors are required. A prototype at 3.5 GHz is etched on a 0.130‐mm‐thick layer substrate with a dielectric material of relative permittivity of 2.22. The simulated and measured scattering parameters are presented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2219–2222, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24526