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Tunable diplexer for cognitive radio RF front-end modules

Erick Emmanuel Djoumessi, Ke Wu

Article (2014)

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Abstract

This paper describes the design and measurement of a varactor-tuned planar diplexer for reconfigurable multi-mode/multi-standard transceiver front-end modules. The proposed diplexer of 3 cm × 1.8 cm is composed of two tunable dual-mode bandpass filters with two varactor diodes. The diplexer channels are 8.8% relative bandwidth at 2.48 and 3.2 GHz for 25 V biased voltage, while 7.5% and 4.1% are obtained at 2.075 and 2.606 GHz for 5 V, respectively. The center-frequency tunability for lower and upper channel filters bands are 21.4% and 20.4%, respectively. Measured insertion loss varies from 2.4 to 4.8 dB and 2.8 to 5 dB for the two channels over the tuning frequency range with better than 30-dB isolation. The lower channel filter (with higher capacitance) presents a better 1-dB compression measurement point (P-1dB) over the tuning frequency range.

Uncontrolled Keywords

Tunable Diplexer, Dual-Mode Filter, Tunable Transceiver, Varactor Diode, Cognitive Radio, SDR

Subjects: 2500 Electrical and electronic engineering > 2500 Electrical and electronic engineering
2500 Electrical and electronic engineering > 2512 Broadcasting
Department: Department of Electrical Engineering
Research Center: POLY-GRAMES - Advanced Research Centre in Microwaves and Space Electronics
PolyPublie URL: https://publications.polymtl.ca/4854/
Journal Title: Universal Journal of Electrical and Electronic Engineering (vol. 2, no. 7)
Publisher: Horizon Research Publishing
DOI: 10.13189/ujeee.2014.020703
Official URL: https://doi.org/10.13189/ujeee.2014.020703
Date Deposited: 17 Mar 2021 10:58
Last Modified: 14 Nov 2022 12:45
Cite in APA 7: Djoumessi, E. E., & Wu, K. (2014). Tunable diplexer for cognitive radio RF front-end modules. Universal Journal of Electrical and Electronic Engineering, 2(7), 278-285. https://doi.org/10.13189/ujeee.2014.020703

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