ISSN: 1304-7191 | E-ISSN: 1304-7205
Design and simulation of a tunable bandpass filter using varactor diodes for wireless and radar applications
1Yıldız Teknik Üniversitesi, Elektronik ve Haberleşme Mühendisliği Bölümü, Yıldız-İSTANBUL
Sigma J Eng Nat Sci 2015; 33(1): 86-93
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Abstract

This article discusses the development of an electronically tunable filter capable of a wide frequency tuning range. Variation of bias (0-5V) changes the center frequency of the filter within 10% while achieving a 1-dB of typical insertion loss. The concept of tuning a filter’s 3-dB bandwidth with voltage is demonstrated and the effect of the bandwidth tuning elements on the tunable filter performance is discussed. The designed filter has a simple structure and the characteristics of wide tuning range of 1800MHz to 2000MHz and low insertion loss of less than -1.20 dB. The tunable bandpass filter can be scaled to the commercial frequencies up to 2.5GHz, offering advantages for most ISM and cellular band applications.