A novel microstrip bandpass filter using triangular open-loop resonators

Chaimool, Sarawuth; Kerdsumang, S.; Akkaraekthalin, Prayoot

doi:10.1109/apcc.2003.1274467

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The element of the proposed MIMO antenna for UWB communication system is shown in Figure 1(a). As the former study [5], it was a circular slot with radius, R, and fed by a 50-⍀ CPW line through a circular patch. The feed patch was with a radius r and an offset between the lowest border of the slot and the lowest border of the patch.…”

Section: Antenna Designsmentioning

confidence: 99%

A compact triangular patch bandpass filter

Kelly

Seager

2008

Micro & Optical Tech Letters

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Section: Antenna Designsmentioning

confidence: 99%

A compact triangular patch bandpass filter

Kelly

Seager

2008

Micro & Optical Tech Letters

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“…Half-wavelength open-loop resonators and hairpin resonators [8][9][10][11][12][13][14] have more attractive features, because their structures suffice for compact bandpass filters. Such filters have a spurious passband at nf 0 , where f 0 is the operating frequency, which will degrade frequency selectivity.…”

Section: Introductionmentioning

confidence: 99%

Harmonic‐suppressing bandpass filter based on coupled triangular open‐loop stepped‐impedance resonators

Chin

Chen

2009

Micro & Optical Tech Letters

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This work develops two harmonic‐suppressing bandpass filters. One has a direct‐coupled‐resonator structure and the other has a cross‐coupled‐resonator structure. The triangular open‐loop stepped‐impedance resonator is used to synthesize filters because it can create two tunable transmission zeros to suppress multi‐spurious responses in the upper stopband. The coupling coefficients of typical coupled pairs of resonators and the external quality factors of two basic feeding configurations are exploited in filter synthesis. A three‐pole Chebyshev filter and a four‐pole selective‐response filter are designed and fabricated herein. The first spurious peaks of these two experimental filters occur at five times and four times the operating frequency, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 187–191, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24866

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“…However, the OLF may be implemented in different shapes, such as square [10,15,16] or triangular [17][18][19]. As a second design example, a triangular OLF was selected to be integrated in a PD.…”

Section: Open-loop Coupled Resonator Filter (Olf)mentioning

confidence: 99%

On the design of equal division single-band filtering dividers with an extended transmission line and resistor as isolation elements

Khan¹,

Zhao²

2017

Turk J Elec Eng & Comp Sci

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This paper introduces a new scheme for effective output port isolation and return loss in RF-filtering divider design. The proposed design incorporates an extended transmission line and a conventional resistor as isolation elements.The technique has a simpler microstrip circuit implementation when it comes to the integration of a single-band bandpass filter with a Wilkinson power divider to achieve simultaneous filtering-dividing action. It is established that if a band-pass filter with a certain fractional-bandwidth is matched to 70.7 Ω , a transmission line section and isolation resistor are sufficient for achieving reasonable output port return loss and isolation in the resulting filtering divider.In experimental validation, two single-band band-pass filters, namely a coupled-line filter and an open-loop coupled resonator triangular filter with center frequencies of 3 GHz and 1 GHz, respectively, effectively replace the conventional quarter-wavelength transformers for equal division of power. The proposed filtering divider structures were fabricated and a reasonable agreement was observed between respective simulated and measured S-parameter responses. The experimental results for a coupled-line filtering power divider and an open-loop triangular filtering power divider were as follows: 1 dB fractional-bandwidths of 15.3% and 12%, port isolations better than 31 dB and 20 dB, and good out-of-band performances up to 2.67f 0 and 2.85f 0 , respectively.

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A novel microstrip bandpass filter using triangular open-loop resonators

Cited by 6 publications

References 6 publications

A compact triangular patch bandpass filter

A compact triangular patch bandpass filter

Harmonic‐suppressing bandpass filter based on coupled triangular open‐loop stepped‐impedance resonators

On the design of equal division single-band filtering dividers with an extended transmission line and resistor as isolation elements

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