Microwave Planar Varactor Tuned Bandpass Filters: Historical Overview

Haeng-Seon LEE  Sang-Won YUN  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.12   pp.1806-1813
Publication Date: 2006/12/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.12.1806
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Emerging Microwave Techniques)
bandpass filters,  microstrip filters,  tunable filters,  varactors,  

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This paper overviews the history of a class of varactor tuned bandpass filters. Since the miniaturization as well as the high performance of the tunable bandpass filters is required for the next generation mobile communication systems, the discussion is focused on the various planar type tunable filters including active configurations. Brief design concepts of various tunable filter configurations as well as their characteristics are discussed.