Tunable Bandpass Filter Using Series Connected Varactor Diodes

Abstract

The paper presents a novel design of tunable third-order parallel-coupled line filter. The design is based on using short-circuited resonators loaded in series by varactor diodes. Integrating the varactor diodes in the middle of the resonator has made this design unique. It is shown that varying the internal capacitance the varactor diodes has a direct impact on tuning the odd-mode resonance frequency of the resonator. The proposed concept is validated by comparing theoretical equations to circuit simulations. Very good agreement is found. When the concept is applied to the design of a third-order parallel line-coupled filter, the obtained tuning range is ±27.3% (central frequency tuned between 1.74 and 3.05 GHz). In addition, the filter presents good electrical performance and compact size (73% surface miniaturization) with respect to the state of art results.

KEYWORDS:

• Bandpass
• Filters
• Parallel-coupled lines
• Tunable
• Varactor diodes

Additional information

Notes on contributors

H. Issa

Hamza Issa graduated from BAU with a BE in electrical engineering. Earned the master's degree from the Grenoble Institute of Technology in optical and radio frequencies and the PhD degree from Grenoble Universities (31 by Shanghai ranking). Currently, a faculty member in the engineering department of BAU. His research interests concern millimeter wave devices with the RFM group of the IMEP-LAHC Laboratory in France.

M. Wehbi

Mohammed Wehbi received his Master of engineering in communications and electronics from Beirut Arab University. Email: [email protected]