Design of Dual-/Tri-Band BPF With Controllable Bandwidth Based on a Quintuple-Mode Resonator

Zhang, Shengfang; Wang, Li Tian; Zhao, Shankun; Zhou, Jie; Wang, Zhipeng; Zhang, Xin; Liang, Xianling; He, Ming; Lu, Jianghua

doi:10.2528/pierl18111305

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…7-9 shows the plots between Q ext and K e against G 1 , d 1 , and d 2 respectively. This shows that when the gap between the two resonators increases, the external quality factor increases while the coupling coefficient decreases according to equation (14) and (15).…”

Section: Resultsmentioning

confidence: 85%

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Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

et al. 2020

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An ultra-compact triple-band bandpass filter based on dual-mode quarter-wave resonator for GSM, GPS, and WiFi applications is presented in this study. The filter consists of three quarter-wave resonators assisting in controlling each passband independently. The first operating frequency band is obtained by the direct-feed resonator which acts as a source to load coupling for the inner two resonators which are operating at higher frequency bands. The outermost resonator is coupled to the inner loaded resonators, thus a pair of transmission zeros between each passband can be excited and hence high-frequency selectivity can be obtained. To miniaturize the overall size of the filter, all resonators are folded and are jointly connected through a common metallic via with the ground. The design has a symmetric structure therefore, even-odd mode analysis method is applied to obtain the three controllable operating frequency bands. The first operating band is centered at 850 MHz which caters for GSM applications, while the second and third frequency bands centered at 1.57 GHz and 2.4 GHz fall in the GPS and WiFi wireless applications. The filter with an ultra-compact size of 0.10 λ g × 0.09 λ g (0.009λ 2 g) despite feed lines (λ g is the waveguide length centered at 850 MHz) is designed, fabricated and measured for the purpose of validation. Both the simulated and measured results are in good agreement and endorse the design concept. INDEX TERMS Tri-band filter, quarter-wavelength resonator, microstrip BPF filter, transmission zeros, wireless applications.

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Section: Resultsmentioning

confidence: 85%

“…Also, the selectivity of the filter is very poor having only two transmission zeros (TZs) between the passbands. The authors of [14], [15], designed dual and triband BPFs based on quintuple and Penta-mode resonators. The fabricated filters have the drawbacks of poor selectivity, poor insertion losses and larger circuit size.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

et al. 2020

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“…Equation (16) shows the relation between the transmission zeros and the tapping positions. By substituting β ¼ 2πf ffiffiffiffiffiffi ffi ε eff p =c in Equation ( 16), the transmission zeros corresponding to the tapping positions are found to be:…”

Section: Geometry Of the Proposed Tri-band Bandpass Filtermentioning

confidence: 99%

Sharp roll‐off triband microstrip bandpass filter with wide stopband for multiband wireless communication systems

Riaz

Virdee

Mariyanayagam

et al. 2022

Int J RF Mic Comp-Aid Eng

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Design of a novel triband bandpass filter is presented for wireless communications systems. The filter is based on inter-coupled stepped impedance resonators and inter-digitally coupled to the input/output ports. The configuration of the filter circuit consists of open-loop resonators that are electromagnetically coupled to each other using inverted T-shaped open stubs. The intrinsic characteristics of filter structure generates five transmission zeros that results in triband bandpass response exhibiting sharp selectivity, high inter-band isolation and a wide out of band rejection. Unlike other triband filters reported recently in literature the proposed single layer filter does not require any short-circuited plated through hole which can introduce fabrication complexity and therefore production costs. Moreover, the triband structure can be configured to provide passbands with identical 3-dB fractional bandwidth and whose center frequency can be equally spaced. In the proposed prototype design presented here the passband frequencies are set to 3.6, 4.6, and 5.6 GHz that corresponds to WiMAX, 5G, and WLAN applications. The consequence of employing opencircuited transmission lines in the design results in a relatively large structure, which can be overcome by employing higher dielectric constant substrate. The proposed triband filter was designed to achieve identical 3-dB fractional bandwidth of 11.9%. Measured results confirm inter-band isolation better than 30-dB. The theoretical model is consistent with the measured results.

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“…The overall size has been reduced using the folded structure and this contributes to the split of the transmission zero which greatly improves the filter selectivity. A dual-/tri-band BPF is proposed in [5] which is based on a quintuple-mode resonator (QMR).…”

Section: Introductionmentioning

confidence: 99%

Dual Band BPF Based on Parallel Coupled Lines Loaded by Open Stubs for Ku-Band Satellite Applications

Amar¹,

Dardeer²,

Zekry³

2019

JEMAA

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This paper presents a dual band Band Pass Filter (BPF) operating at both the downlink and uplink frequency bands for Ku-band satellite applications. The commonly used frequency band in mobile communications satellites is the Ku-band. These mobile satellite systems help connect remote regions, vehicles, ships, people and aircraft to other parts of the world and/or other mobile or stationary communications units, in addition to serving as navigation systems. The structure of the proposed filter is based on parallel coupled microstrip lines and four sections are used. Tuning the two operational bands can be achieved using two open-circuited stubs at the first and last sections of the parallel coupled microstrip lines. The proposed filter is adjusted to operate at 12.54 GHz and 14.14 GHz for downlink and uplink bands, respectively. The proposed dual band BPF is fabricated, measured, and good agreement is obtained between simulated and measured results.

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Design of Dual-/Tri-Band BPF With Controllable Bandwidth Based on a Quintuple-Mode Resonator

Cited by 7 publications

References 13 publications

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

Sharp roll‐off triband microstrip bandpass filter with wide stopband for multiband wireless communication systems

Dual Band BPF Based on Parallel Coupled Lines Loaded by Open Stubs for Ku-Band Satellite Applications

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