A GCPW CMOS Bandpass Filter for Local Multipoint Distribution Systems

M.-H. Weng Metal Industries Research & Development Center, 3F, No. 88, Luke 5th Rd., Lujhu Township, Kaoshiung, Taiwan 82151, Taiwan

C.-Y. Huang Department of Electrical Engineering, National University of Tainan, 33, Sec. 2, Shu-Lin St., Tainan 700, Taiwan;, Email: [email protected]

R.-Y. Yang Department of Material Engineering, National Pingtung University of Science and Technology, No. 1, Syuefu Rd., Neipu Township, Pingtung County 912, Taiwan

C.-Y. Hung Department of Electronics Engineering and Computer Sciences, Tung-Fang Institute of Technology, No. 110, Tung-Fung Road, Hunei Shiang, Kaohsiung County 829, Taiwan

Pages 445-452 | Published online: 03 Apr 2012

Cite this article
https://doi.org/10.1163/156939310790966196

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Abstract

In this paper, an integrated millimeter-wave bandpass filter (BPF) using a standard CMOS process was designed and fabricated successfully for Local multipoint distribution systems (LMDS). Ground coplanar waveguide (GCPW) line, instead of the microstrip line, is used for realizing the proposed filter without extra transition between the CPW and microstrip, reducing the design complex. Moreover, the bandwidth of the proposed filter can be easily tuned by varying the structural parameters. The design procedure, including the electromagnetic (EM) and circuit simulation, is addressed. The measured results of the circuit have a center frequency of 39.6 GHz, an insertion loss of 5.5 dB, and a 3dB bandwidth of 33%. In addition, a transmission zero at 51.49 GHz appears near the passband edge, improving the band selectivity.

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