Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths

Zhou, Mingqi; Tang, Xiaohong; Xiao, Fei

doi:10.1109/lmwc.2008.2007696

Cited by 75 publications

(52 citation statements)

References 6 publications

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“…In addition, the filter has five TZs at 0.76, 2.04, 2.58, 3.0, and 5.15 GHz with rejection of 75, 51, 65, 45 and 55 dB, respectively. Finally, Table 1 is provided to compare the proposed dual-band filter with those in [1,8,14,15] in terms of a few key parameters. It is observed that the proposed filter in this paper occupies smaller size, exhibits better performance in passband and has more transmission zeros.…”

Section: Filter Design Fabrication and Measurementmentioning

confidence: 99%

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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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Section: Filter Design Fabrication and Measurementmentioning

confidence: 99%

“…In [1][2][3][4][5][6][7], stub-loaded resonators (SLRs) and stepped impedance resonators (SIRs) were used to constitute dual-band BPFs. In [8], a dual-band BPF was constructed by cascading two E-type resonators. In [9], two multi-mode resonators were connected together by a grounded via to implement a 3-order dualband BPF.…”

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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show abstract

“…This method can produce one or two TZs on either side of the passbands, and it has been widely applied in cavity filters. However, one disadvantage of cross-coupling method is that the positions where the TZs appear are related to the coupling matrix, which suggests that the TZs are not independent from the passbands of the filters [6,7]. Moreover, it is difficult to apply this method to the resonators with irregular geometric topologies [8].…”

Section: Introductionmentioning

confidence: 99%

Design of an Interdigital Band-Pass Filter for Out-of-Band Rejection Improvement

Li¹,

Cao²,

Lin³

et al. 2016

PIER Letters

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Abstract-In this letter, an interdigital band-pass filter is proposed for out-of-band rejection improvement. Seven quarter-wavelength resonators are employed to form the passband. Three extra transmission zeros (TZs) on both sides of the passband are implemented by introducing source-load coupling and dumbbell defected ground structures (DGS). As demonstrated by the measured results, out-of-band rejection and selectivity are improved by these three TZs, and good performances are achieved. The proposed method of increasing out-of-band rejection is feasible and applicable in the design of modern microstrip filters.

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“…From then on, a multitude of improved bandpass filters based on SIRs have been developed [12][13][14][15][16][17]. Using the method of the odd-and even-mode analysis, the open or short stub-loaded resonators (SLRs) are another new and useful structures to design dual-band and even multi-band filters [18][19][20][21][22][23][24]. In [18], a dualband BPF using open stub-loaded resonator (OSLR) and 0 • feeding structure was first analyzed and designed.…”

Section: Introductionmentioning

confidence: 99%

Novel Design of a Compact Triple-Band Bandpass Filter Using Short Stub-Loaded Sirs and Embedded Sirs Structure

Zhang²,

Li³

et al. 2013

PIER

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Abstract-A novel compact planar triple-band bandpass filter using two sets of short stub-loaded stepped impedance resonators (SSLSIRs) and a pair of embedded stepped impedance resonators (ESIRs) has been proposed. The SSLSIRs can adjust the bandwidths of the corresponding passbands over a wide range, and the ESIRs employing non 0 • -feed coupled structure with mixed electric and magnetic coupling can obtain an extra transmission zero. The embedded resonators structure can further miniaturize the dimensions of the whole triple-band filter. The operating frequencies of the SSLSIRs and ESIRs are designed for the applications of the WLAN (2.45/5.2 GHz) and WiMAX (3.5 GHz) systems, respectively. The simulated and measured results are both presented and show good agreement.

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Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths

Cited by 75 publications

References 6 publications

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

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

Design of an Interdigital Band-Pass Filter for Out-of-Band Rejection Improvement

Novel Design of a Compact Triple-Band Bandpass Filter Using Short Stub-Loaded Sirs and Embedded Sirs Structure

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