Novel Second-Order Dual-Mode Dual-Band Filters Using Capacitance Loaded Square Loop Resonator

Fu, Shuai; Wu, Bian; Chen, Jia; Sun, Shou Jia; Chen, Liang

doi:10.1109/tmtt.2011.2181859

Cited by 79 publications

(58 citation statements)

References 15 publications

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“…8(a). The patch perturbation is equivalent to a capacitance of C P , the perturbation C P affects the even-mode resonance frequency (f 2 ) but has no relationship with the odd-mode one (f 1 ) [12,15]. Fig.…”

Section: Filter Designmentioning

confidence: 99%

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Dual-Mode Dual-Band Bandpass Filter Based on Square Loop Resonator

Deng¹,

Yang²,

Sun³

et al. 2013

PIER C

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Abstract-In this paper, a dual-mode dual-band microstrip bandpass filter utilizing asymmetric square loop resonators is proposed. A pair of bent open-circuited stubs is installed to the loop as perturbation stubs. By stretching the perturbation stubs more than half-wavelength of the loop, the degenerated modes in a loop are split for dual-band operation. Two asymmetric resonators are cascaded to form two bands. Even-and odd-mode analysis method is used to deduce the resonant frequencies of two bands. Based on the transmission line theory, resonant frequencies of the two resonances are derived. According to the resonant conditions, a kind of dual-mode dual-band bandpass filter can be easily designed. Finally, a dual-band filter with two bands centering at 1.9 GHz and 2.6 GHz is designed in a comprehensive way. Measured results of experimental circuit show good agreement with simulated responses.

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Section: Filter Designmentioning

confidence: 99%

“…8(b) demonstrates the resonances of the evenmode (f 2 ) and odd-mode (f 1 ) against perturbation sizep. The oddmode resonance (f 1 ) has a minor change because that the length of the transmission line adjacent to the perturbation patch is disturbed when the perturbation size changes [15]. Fig.…”

Section: Filter Designmentioning

confidence: 99%

Dual-Mode Dual-Band Bandpass Filter Based on Square Loop Resonator

Deng¹,

Yang²,

Sun³

et al. 2013

PIER C

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“…In [1] a patch resonator was used to generate a transmission zero in a bandpass filter (BPF) response without resorting to any cross couplings, thereby resulting in improved frequency selectivity. Square patch resonators were applied in the design of BPFs in [2] and [3], whereas they were used to design dual-band BPFs in [4] and [5]. A particular area where the use of dual-mode or multi-mode resonators can be beneficial is in diplexer designs with resonant junctions [6].…”

Section: Introductionmentioning

confidence: 99%

Microstrip diplexers with dual-mode patch resonant junctions

Ogbodo

Wang

2016

2016 46th European Microwave Conference (EuMC)

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Abstract-A conventional diplexer is made up of two channel filters which are connected to a transmission-line based signal distribution network. In this work, a novel diplexer has been proposed and designed using hairpin resonator filters that are joined together using a patch resonator. The patch being a dualmode is made to resonate at the centre frequencies of the channel filters in corresponding modes. The patch functions as a signal splitter and at the same time as a resonant pole for each of the channel filters. A diplexer with the channel centre frequencies of 3.99 GHz and 4.39 GHz and 4% fractional bandwidth has been designed and tested. The simulated and measured results show very good agreements.

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“…For miniaturization, a variety of dual-mode resonators were proposed to design filters [10][11][12]. Many reports have been published about dual-mode dual-band BPFs [13][14][15][16][17][18][19], in which the first harmonic even-and odd-mode are utilized to form the second passband, thus leading to both passbands dependent on each other which is undesirable.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Bandpass Filter With Wide Upper Stopband Using Novel Stepped Impedance Stub-Loaded Quad-Mode Resonator

Lin¹,

Zhang²,

Sun³

et al. 2015

PIER Letters

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Abstract-This paper presents a wide upper stopband dual-band bandpass filter (BPF) with controllable passband frequencies and bandwidths as well as a high out-of-band rejection level. The proposed filter is realized by utilizing a novel stepped impedance stub-loaded quad-mode resonator. All the four-mode equivalent circuits of the resonator are quarter-wavelength stepped impedance resonators (SIRs), and their fundamental resonance frequencies are used to form the passbands, so the designed filter has a compact circuit size. By controlling the impedance and length ratios of the stubs of the resonator, wide upper stopband performance is obtained. Hook-shape feed-lines and source-load coupling are applied to provide appropriate external coupling and generate three extra transmission zeros, which greatly improve the selectivity of the proposed filter. An experimental filter operating at 1.5 and 3.5 GHz is designed, fabricated, and measured for validation. The measured results have good agreement with the simulated ones.

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Novel Second-Order Dual-Mode Dual-Band Filters Using Capacitance Loaded Square Loop Resonator

Cited by 79 publications

References 15 publications

Dual-Mode Dual-Band Bandpass Filter Based on Square Loop Resonator

Dual-Mode Dual-Band Bandpass Filter Based on Square Loop Resonator

Microstrip diplexers with dual-mode patch resonant junctions

Dual-Band Bandpass Filter With Wide Upper Stopband Using Novel Stepped Impedance Stub-Loaded Quad-Mode Resonator

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