A Compact Tri-Band Bandpass Filter Using Two Stub-Loaded Dual Mode Resonators

Rahman, MuhibUr; Park, Jung‐Dong

doi:10.2528/pierm17120404

Cited by 30 publications

(21 citation statements)

References 19 publications

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“…where f l and f h represent the lower and higher frequencies of the two resonant frequency bands. Also, the external quality factor, 'Q e ', can be calculated from full wave simulated transmitted coefficients given in [17] as:…”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

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A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

Sami¹,

Rahman²

2019

PIER C

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This paper presents a very compact quintuple band bandpass filter utilizing multimode stub loaded resonator. A single symmetric resonator is loaded with a short ended stub at the middle along with four pairs of open-ended stubs. The open-ended stubs are folded towards each other in order to make the design more compact and improve the selectivity of the bandpass filter. Because of symmetry, the circuit is analyzed with the help of even-odd mode analysis. The proposed bandpass filter operates

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Section: Simulated and Measured Resultsmentioning

confidence: 99%

“…They create more passbands by using higher modes which in turn increase the losses and circuit area of the design. Recently, a tri-band bandpass filter is presented using SLRs stated as stub loaded dual mode resonators [17]. One inner and outer stub inserted resonators are utilized to achieve the tri-band response.…”

Section: Introductionmentioning

confidence: 99%

A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

Sami¹,

Rahman²

2019

PIER C

Self Cite

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“…This type of filters should satisfy the following specifications, such as size compactness, harmonics suppression, high selectivity, and insertion loss reduction in the achieved band to be compatible with the modern communication systems [3,4]. Transmission zeros should also be taken into account in filter design to achieve the desired selectivity [5][6][7][8][9]. The resonator with open-loop configuration can be achieved by using a half-wavelength microstrip line of the operating frequency with coupling structure.…”

Section: Introductionmentioning

confidence: 99%

Design of Dual-Band Dual-Mode Band-Pass Filter Utilizing 0° Feed Structure and Lumped Capacitors for WLAN/WiMAX Applications

2020

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Two dual-band second-order highly selective band pass filters operated at 3.5/5.5 GHz and 3.5/6 GHz for wireless local area network /worldwide interoperability for microwave access WLAN/WiMAX applications are introduced in this paper. The designed filters are inspired of utilizing two coupled open-loop resonators loaded with stub, spiral resonators and lumped capacitors. The filters are designed based on calculating the desired coupling matrix and the external quality factor. The first and the second filters are designed at the fundamental mode of 3.5 GHz then the first filter is loaded with two spiral resonators in the microstrip line to produce the desired band stop behaviour, which in turn achieves the second pass-band. However, the second band of the second filter is achieved by loading the stub with the lumped capacitors, which controls the second mode. The centre frequency of the second band is adjusted by varying the lumped capacitors values. The two designed filters have insertion loss less than 0.7 dB in the pass-band region, high selectivity with more than 4 transmission zeros and more than 20 dB attenuation level in the stop band region. The suggested filter has compact size and high selectivity with tunability behavior. The two filters are fabricated and measured to validate the simulated results.

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“…However, it has narrow bandwidth and contains only two transmission zeros which decrease the sharp selectivity of the filter. Recently, a triband response is achieved by means of a combination of SLR termed as SLDMRs [12]. Two SLDMRs combined with intra-resonator coupling between inner and outer rings are utilized to obtain a triple passband response.…”

Section: Introductionmentioning

confidence: 99%

Design of compact tri and quad band band-pass filters using stub loaded resonators for wireless applications

2019

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A compact tri and quad band band-pass filters (BPFs) utilizing stub loaded resonators is presented for wireless applications. The proposed resonator has been designed and analyzed using even-odd mode analysis due to its symmetrical geometry. Open-ended stubs are loaded at an appropriate position in the dual-mode resonator to achieve tri and quad passbands. To reduce the circuit size and create transmission zeros at our desired frequencies, a symmetrical meandered shape resonator is loaded with open-ended identical stubs which are bent towards each other. The proposed BPFs are tune to operate at GSM (900 MHz), LTE (2300 MHz), WiMAX (3.5 GHz), and WLAN (5.4 GHz) bands. Significant improvements are observed in terms of circuit size, 3-dB fractional bandwidth, insertion loss, and transmission zeros. To check the validity of the proposed tri and quad BPFs, these are simulated, fabricated and measured. The simulated and measured results are compared and strong agreement is observed. The proposed filters can be prospective candidates for wireless communication applications.Keywords Stub loaded resonators (SLR) · Band-pass filters (BPFs) · Triple BPF · Quad BPF · Even and odd mode analysis · WLAN (wireless local area network) · WiMAX (worldwide interoperability for microwave acces) · LTE (long term evolution)

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A Compact Tri-Band Bandpass Filter Using Two Stub-Loaded Dual Mode Resonators

Cited by 30 publications

References 19 publications

A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

Design of Dual-Band Dual-Mode Band-Pass Filter Utilizing 0° Feed Structure and Lumped Capacitors for WLAN/WiMAX Applications

Design of compact tri and quad band band-pass filters using stub loaded resonators for wireless applications

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