Journals Information
Universal Journal of Electrical and Electronic Engineering Vol. 2(7), pp. 278 - 285
DOI: 10.13189/ujeee.2014.020703
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Tunable Diplexer for Cognitive Radio RF Front-end Modules
Erick Emmanuel Djoumessi 1,*, Ke Wu 2
1 Intel Corporation, Libertyville, 60048, Illinois, United States
2 Poly-Grames Research Center, Ecole Polytechnique de Montreal, Montreal, H3T1J4, Quebec, Canada
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 脳 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.
KEYWORDS
Tunable Diplexer, Dual-Mode Filter, Tunable Transceiver, Varactor Diode, Cognitive Radio, SDR
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Erick Emmanuel Djoumessi , Ke Wu , "Tunable Diplexer for Cognitive Radio RF Front-end Modules," Universal Journal of Electrical and Electronic Engineering, Vol. 2, No. 7, pp. 278 - 285, 2014. DOI: 10.13189/ujeee.2014.020703.
(b). APA Format:
Erick Emmanuel Djoumessi , Ke Wu (2014). Tunable Diplexer for Cognitive Radio RF Front-end Modules. Universal Journal of Electrical and Electronic Engineering, 2(7), 278 - 285. DOI: 10.13189/ujeee.2014.020703.