A Dual-Band Bandpass Filter Using a Single Dual-Mode Ring Resonator

Sun, Sheng

doi:10.1109/lmwc.2011.2132119

Cited by 111 publications

(77 citation statements)

References 11 publications

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“…Recently, dualmode filters have been an attractive solution for dual-band applications due to its intrinsic compactness and dual-band characteristic. Different approaches in designing dual-mode dual-band filters are proposed using ring resonators [1,2,3], stubloaded resonators [4,5], slotted patch resonators [6,7,8,9,10], and resonators with other different structures [11,12]. Among these dual-band dual-mode approaches, adjustable frequency ratio is obtained in [2] using microwave C-sections, however the coupling gap is extremely small.…”

Section: Introductionmentioning

confidence: 99%

A compact dual-mode dual-band bandpass filter design with controllable first passband

Shi

2014

IEICE Electron. Express

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A single patch resonator with right crossed slots and rectangular perturbation is proposed to implement a dual-mode dual-band bandpass filter. The first resonance varies with the width and length change of the slots leading to a flexibly tuned first passband during the design phase. The second resonance is not perturbed because of the right crossed slots. The rectangular perturbation located at the diagonal creates transmission zeros near the first passband edges while the spur-lines generate transmission zeros near the second passband so as to achieve higher frequency selectivity. Therefore the bandwidths of the two passbands can be tuned independently. A dual-mode dual-band filer operating at 1.57 and 5.2 GHz for GPS and WLAN application is designed and manufactured for demonstration. Good agreements are found between simulation and measurements. Keywords: bandpass filter, dual-band, dual-mode, right crossed slots Classification: Microwave and millimeter wave devices, circuits, and systems References[1] T.

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Section: Introductionmentioning

confidence: 99%

A compact dual-mode dual-band bandpass filter design with controllable first passband

Shi

2014

IEICE Electron. Express

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“…To reject the unwanted frequency signals, the power divider is usually cascaded with filters [3][4][5][6]. However, this type of power divider suffers from large size.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band in‐phase filtering power dividers integrated with stub‐loaded resonators

Zhang

Yang

2015

IET Microwaves, Antennas & Propagation

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A compact microstrip dual-band in-phase filtering power divider is presented in this study. The integrated two stub-loaded resonators are applied to realise the dual-band filtering response and compact size. Based on the evenodd-mode analysis, an analytical model of the proposed power divider structure is presented. To improve the frequency selectivity, a source-load cross coupling is introduced by placing input and output coupling lines closely. A prototype of the dual-band in-phase filtering power divider centred at 3.5 and 5 GHz with 3 dB fractional bandwidth of 7.4 and 4.2% is designed, fabricated and measured. The size of the fabricated power divider is 0.27l g × 0.35 l g . The simulated and measured results are presented and show good agreement.

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“…All the dual-band BPFs presented above were designed using two or more resonators. 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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A Dual-Band Bandpass Filter Using a Single Dual-Mode Ring Resonator

Cited by 111 publications

References 11 publications

A compact dual-mode dual-band bandpass filter design with controllable first passband

A compact dual-mode dual-band bandpass filter design with controllable first passband

Dual‐band in‐phase filtering power dividers integrated with stub‐loaded resonators

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

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