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Broadband tunable filters using high Q passive tunable ICs

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3 Author(s)
Manh-Tai Nguyen ; Paratek Microwave Inc., Columbia, MD 21046 USA ; Winter D. Yan ; Edward P. W. Horne

This paper presents the performance of tunable bandpass filters using high Q, wide-tuning-range passive tunable ICs. These passive tunable ICs are fabricated using ParaScantrade, Paratekpsilas proprietary doped BST material. The tunable capacitors in these passive ICs have a tuning ratio of 4.15:1 and a Q factor over 100, from 100 MHz to 1 GHz. Two tunable filters using these passive tunable ICs were designed, fabricated, and tested. The two-pole tunable filter has a tuning range of 56% from 300 to 470 MHz, an insertion loss less than 2 dB over the entire tuning range, and an IIP3 of 52 dBm. The three-pole filter demonstrates a tuning range of 74% from 230 to 400 MHz, an insertion loss less than 2.5 dB. Control of the tunable filters is achieved through an on-board, high voltage ASIC and a microprocessor. The two-pole filter has been evaluated over temperature from -40degC to 85degC and minimal temperature drift was observed.

Published in:

Microwave Symposium Digest, 2008 IEEE MTT-S International

Date of Conference:

15-20 June 2008