A Modified Interdigital Coupling Structure for Narrow Bandpass Filters Design

Autor:	L. Jin, J.-J. Ge
Rok vydání:	2015
Předmět:	Radiation Materials science business.industry Bandwidth (signal processing) Chebyshev filter Electronic Optical and Magnetic Materials Optics Narrowband Band-pass filter Return loss Insertion loss Electrical and Electronic Engineering Center frequency Telecommunications business Passband
Zdroj:	Electromagnetics. 35:550-556
ISSN:	1532-527X 0272-6343
DOI:	10.1080/02726343.2015.1101809
Popis:	This article presents a modified interdigital coupling structure by using quarter- and half-wave resonators alternately, and a narrowband bandpass filter operating at X-band has been designed proving the feasibility of the proposed structure. The weak coupling required for narrowband filter is realized by arranging five quarter- and half-wave resonators alternately. In this article, simulated and measured result for a narrowband filter with fifth-order Chebyshev response is proposed. The filter is fabricated on 0.508-mm-thick Rogers RO4350B (Chandler, AZ, USA) with dielectric constant 3.66 using standard photolithography technique. Configurations produce very small and compact filter size, at 28.30 × 10.63 mm2. The simulated frequency responses have demonstrated a good narrowband property from 9.84 to 10.25 GHz (3-dB bandwidth), which is a fractional bandwidth of 4.1% at the center frequency, 10 GHz. The measured passband insertion loss is less than 4.56 dB and the passband return loss is better t...
Databáze:	OpenAIRE
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