A microstrip bandpass filter using a symmetrical parallel coupled-line structure

Jantree, Jaruek; Kerdsumang, S.; Akkaraekthalin, Prayoot

doi:10.1109/apcc.2003.1274466

Cited by 4 publications

(1 citation statement)

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“…FBW of 2.07% is achieved while maintaining small size using cross coupled hairpin resonators, but passband IL of 3.8 dB and RL of 13 dB does not fulfil the requirements of receiver side bandpass filter of a wireless communication system [15,16]. Microstrip bandpass filter using a symmetrical parallel coupled line structure achieves 3 dB FBW of 5% with passband IL 1.5 dB and RL 30 dB while maintaining size almost equal to hairpin line filter [17]. FBW of 5.5% is achieved using folded λ/4 resonators coupled through shunt inductors.…”

Section: Prior Workmentioning

confidence: 99%

Novel Microstrip Hairpinline Narrowband Bandpass Filter Using via Ground Holes

Hasan¹,

Nadeem²

2008

PIER

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Abstract-In this paper, we present a novel improved hairpinline microstrip narrowband bandpass filter with via ground holes. The new filter design methodology is derived from conventional hairpinline filter design. This design methodology incorporates use of λ/8 resonators, thereby reducing the size of the filter by 35% as compared to the conventional design. An analysis is presented to show the effects of tap point height and microstrip width on fundamental parameters of filter and subsequent relationships are developed. Through use of via ground holes and a wider microstrip line for resonators, 3 dB Fractional Bandwidth (FBW) less than 2%, Insertion Loss (IL) less than 1.6 dB and Return Loss (RL) better than 40 dB is achieved with midband center frequency 1 GHz. Spurious response suppression is achieved till 3f 0 . Robustness of this design approach is demonstrated by designing filters on two more substrates having ε r 2.17 and 9.2. As low as 0.48% FBW was achieved by using different substrates. The design approach is successfully tested for center frequency upto 2 GHz beyond which folding the resonator becomes practically difficult. Finally, a bandpass filter is designed with this design methodology and fabricated using FR4 substrate. S-parameter measurements show a good agreement with the simulated results. 394Hasan and Nadeem

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Section: Prior Workmentioning

confidence: 99%