Microstrip Bandpass Filter with Wide Stopband and High Out-of-Band Rejection

Farhat, Mohamad; Virdee, Bal S.; Ghareeb, Nader

doi:10.3844/ajeassp.2019.543.548

Cited by 2 publications

(1 citation statement)

References 13 publications

(15 reference statements)

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“…The open loop C-shape resonators have a low out-of-band rejection. In order to increase the out-of-band rejection across a wide frequency spectrum, this is achieved with the assistance of triangular shaped capacitive loading at the open-end of the openloop resonators that incorporate "L" shaped slots [10]. The consequence of this is the realisation of harmonic suppression over a very wide frequency bandwidth extending up to 17 GHz as shown in Figure 3.…”

Section: A Resonators Configurationmentioning

confidence: 99%

A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

Abdul-Niby¹,

Farhat²,

Nahas³

et al. 2017

Eng. Technol. Appl. Sci. Res.

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This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and bandwidth of the three passbands independently. In addition, the six transmission zeros created around the passbands results in a tri-band filter with high selectivity, sharp 3 dB cut-off frequency, high isolation, low passband insertion-loss and high out-of-band harmonic rejection across an ultra-broadband frequency range up to 17 GHz. The proposed technique has the ability to switch from triple to dual band by removing one pair of the inner resonators. Design methodology and simulation results of the filter are provided.

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Section: A Resonators Configurationmentioning

confidence: 99%

A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

Abdul-Niby¹,

Farhat²,

Nahas³

et al. 2017

Eng. Technol. Appl. Sci. Res.

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Wide‐Passband Microstrip Filters With Wide Stopband Based on Half‐Wavelength Resonators Coupled by Short Connected Line

Fan,

Han,

Gong

et al. 2024

International Journal of RF and Microwave Computer-Aided Engine

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A novel and simple design method of wide‐passband filters with wide stopband based on half‐wavelength (λ/2) resonators coupled by a short connected line (SCL) is proposed and analysed in this paper. Different from the traditional parallel‐coupled structure filters, SCL is proposed to realize a strong coupling between two adjacent resonators and suppress the parasitic passbands simultaneously. And the eigenmode analysis method and impedance ratio characteristics are both used to reveal the mechanism of wide‐stopband implementation. To further expand the stopband, filters based on step‐impedance resonators (SIRs) with SCL are proposed and analysed in detail. To verify the proposed design method and wide‐stopband filtering structures, three 4‐pole filters with uniform‐impedance resonators (UIRs), SIRs with same impedance ratio, and SIRs with different impedance ratios are designed, fabricated, and measured. The proposed filters can realize a wide stopband up to 5.8f0 with rejection level better than 20 dB. Moreover, the proposed filters can easily realize a wide bandwidth.

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Microstrip Bandpass Filter with Wide Stopband and High Out-of-Band Rejection

Cited by 2 publications

References 13 publications

A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

Wide‐Passband Microstrip Filters With Wide Stopband Based on Half‐Wavelength Resonators Coupled by Short Connected Line

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