A new compact quad‐band bandpass filter using quad‐mode stub loaded resonator

Weng, Min‐Hang; Ye, Chang-Sin; Su, Yan–Kuin; Lan, Siang-Wen

doi:10.1002/mop.28403

Cited by 11 publications

(14 citation statements)

References 8 publications

(13 reference statements)

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“…(2) The antenna structure utilizes the resonance of the feeding probe which is neglected in other designs as the probe length was limited by the DR size and matching was sometimes difficult to achieve. (3) Using water as DR, flexible feeding structures (such as folded feeding probe in this article) can be easily tuned and experimented inside the water that is difficult for conventional ceramic dielectric materials [7,8]. (4) Due to the transparency of water, the proposed water antenna is almost optically transparent.…”

Section: Resultsmentioning

confidence: 99%

“…In references [1][2][3][4], two dual-band filters with different center frequencies are combined in parallel with common input/ output ports to form quad-band filter. Two electric-coupling quad-mode resonators are used to realize the quad-band filter [5][6][7]. In references [8,9], only one quad-mode resonator is utilized to form the first-order quad-band filter.…”

Section: Introductionmentioning

confidence: 99%

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A compact quad‐band bandpass filter with separate signal paths

Yan

Sun

Cao

2015

Micro & Optical Tech Letters

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This article presents a compact microstrip quad-band bandpass filter. Each passband has separate signal path, thus, it is convenient to control the passband performance independently. The third passband consists of two electrically coupling half-wavelength resonators and its input/output coupling adopts the tapped line structure. Meantime, the third passband structure serves as one part of the input/ output coupling structure of other three passbands and, for other three passbands, it not only accomplishes the input/output coupling but also provides the direct source-load coupling which can generate the transmission zeros resulting in high frequency selectivity. Other three passbands are all constructed by two magnetically coupling quarterwavelength resonators. The four passband structures are novelly combined together so as to result in a compact size. A prototype filter with the center frequencies of 2.4/3.5/4.5/5.8 GHz is designed, fabricated, and measured. The measured results give a good agreement with the simulated ones, which verifies the effectiveness of the filter.ABSTRACT: In this article, a wideband, hybrid rectangular water antenna is proposed to cover the digital video broadcasting-handheld (DVB-H) band. The hybrid structure combines a dielectric resonator antenna (DRA) and a monopole antenna to effectively double the available bandwidth without compromising other characteristics. With a proper design, the resonance of the DRA and the resonance from the feeding probe are combined to produce a wideband response. The proposed antenna has an extremely wide bandwidth from 464 to 1017 MHz (for S11 < 26 dB), or a fractional bandwidth of 74.6%. Both the computer simulations and measurements are conducted to validate the antenna performance. It is demonstrated that this new antenna is an promising candidate for DVB-H applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A compact quad‐band bandpass filter with separate signal paths

Yan

Sun

Cao

2015

Micro & Optical Tech Letters

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“…Planar structures, such as microstrip, coplanar waveguides, and coplanar striplines are greatly preferred in microwave multiplexer design due to their low loss and cost, easy fabrication, compactness, etc. Among these, microstrip is the most preferred structure type, and is frequently used in multimode, multiband, and tunable filters [1][2][3][4][5][6]. To date, many microstrip diplexers or triplexers have been studied by various researchers [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A novel microstrip diplexer design with tunable bandwidths and switchable channels for 4.5G applications

Görür¹,

Ozdemir²,

Şahi̇n³

et al. 2017

Turk J Elec Eng & Comp Sci

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Abstract:In this paper, a novel microstrip diplexer with tunable bandwidths and switchable channels is presented by using dual-mode square loop resonators (DMSLRs). Two resonators at different electrical lengths are coupled to input and output ports with lumped capacitors, and the isolation between the output ports is optimized by means of these capacitors. In order to obtain tunable bandwidth in each channel, varactor diodes are located at the orthogonal corners of the proposed resonators. In addition, the proposed resonators have reference patch elements at the lateral arms to provide convenience of varactor diode capacitances, such as perturbation elements. Depending on the capacitances of the varactor diodes, the bandwidths of each channel can be tuned. Furthermore, each channel can be switched off. The designed diplexer has two channels at the center frequencies of 1.8 and 2.6 GHz, which are allocated to 4.5G applications.Three-dB bandwidths can be tuned between 60 and 160 MHz for the first channel and between 150 and 350 MHz for the second channel. Isolation between the output ports is obtained as better than 18 dB in each channel. The designed diplexer was fabricated and measured, and the measured results were consistent with the predicted results.

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“…In , stub‐loaded QMRs were constructed to achieve a dual‐mode dual‐band BPF, a via was added to the stub for the purpose of splitting the four modes into two dual‐modes. In , the QMR was applied for the quad‐band application by fully using each modes generated from the QMR. Therefore, a conclusion can be obtained based on —none of them result in a wide bandwidth and relatively high selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…In , the QMR was applied for the quad‐band application by fully using each modes generated from the QMR. Therefore, a conclusion can be obtained based on —none of them result in a wide bandwidth and relatively high selectivity. Although these BPFs in achieved a compact size due to the reason of only one QMR involved in the design, the properties of wide bandwidth and high selectivity of QMR were neglected because of the split of four modes.…”

Section: Introductionmentioning

confidence: 99%

Highly selective dual-wideband bandpass filter using quad-mode resonators for WLAN and WIMAX applications

Qiang

Wang

Kim

2015

Microw. Opt. Technol. Lett.

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A highly selective dual‐wideband bandpass filter (BPF) using quad‐mode resonators (QMRs) is presented. The proposed QMR loaded with two folded open‐ended stubs and a T‐shaped stub exhibits not only four transmission poles but also two transmission zeros, which results in a wider bandwidth and sharper cut‐off responses. The dual‐band performance is realized with two QMRs sharing a common input and output. Four transmission zeros are found located at 2.09, 2.67, 3.18, and 4.14 GHz, with an attenuation level that is less than −20 dB. The measured center frequencies of the two operation passbands are 2.4 (WLAN) and 3.5 GHz (WiMAX), and the minimum insertion loss of the two passbands are 0.87 and 1.4 dB, with 3 dB fractional bandwidths of 17.5% and 16%, respectively. The stopband suppression is greater than 20 dB from 4.2 to 6.5 GHz. Good agreement between the simulated and measured results demonstrates the validity of the proposed BPF. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1417–1423, 2015

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A new compact quad‐band bandpass filter using quad‐mode stub loaded resonator

Cited by 11 publications

References 8 publications

A compact quad‐band bandpass filter with separate signal paths

A compact quad‐band bandpass filter with separate signal paths

A novel microstrip diplexer design with tunable bandwidths and switchable channels for 4.5G applications

Highly selective dual-wideband bandpass filter using quad-mode resonators for WLAN and WIMAX applications

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