Design of a High Band Isolation Diplexer for GPS and Wlan System Using Modified Stepped-Impedance Resonators

Yang, Ru‐Yuan; Hsiung, Chin-Min; Hung, Cheng‐Yuan; Lin, C.-C.

doi:10.2528/pier10060913

Cited by 31 publications

(18 citation statements)

References 15 publications

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“…The most employed distribution network used today may be the T-junction (as in [1][2][3][4][5]) connecting the T X and RX filters. The diplexer with the T-junction configuration has drawbacks of large volume and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Wang¹,

Xu²,

Wang³

et al. 2012

PIER

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Abstract-This paper presents a method for synthesizing coupled resonator diplexers composed of T X and RX filters (two types of junctions connecting the T X and RX filters are considered). For the first junction type, the common port is directly coupled to the first resonator of the T X and RX filters, respectively. For the second junction type, common node is realized by adding an extra resonator besides those of the T X and RX filters. The method is based on the evaluation of the characteristic polynomials of the diplexer using the proposed linear frequency transformation and well-established method, and then the "N + 3" coupling matrix of overall diplexer can be obtained using hybrid optimization methods. Two diplexers have been designed and fabricated to validate the proposed method.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Wang¹,

Xu²,

Wang³

et al. 2012

PIER

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show abstract

“…In [2], a conventional microstrip filter was based primarily on transmission-line structures but occupied a large area due to quarter-or half-wavelength resonator requirements. Some studies propose better solutions for reducing circuit size, such as a stepped impedance resonator (SIR) [3][4][5], defected ground structure (DGS) resonator [6][7][8], patch-via-spiral resonator [9], or net-type resonator [10]. Unfortunately, these methods are still limited in design flexibility, quality factor, and cost.…”

Section: Introductionmentioning

confidence: 99%

Very Compact Full Differential Bandpass Filter With Transformer Integrated Using Integrated Passive Device Technology

Wu¹,

Kuo²,

Chen³

2011

PIER

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Abstract-In this study, a very compact, second-order, full differential bandpass filter is presented. To achieve compact circuit area and system-in-package (SiP) applications, the transformer structure is integrated using integrated passive device (IPD) technology on a glass substrate. The coupled resonator synthesis method is used to achieve the bandpass filter design and suitably adjust the tapped feed-lines to obtain good impedance match at all ports. The area (1.27 mm×1.27 mm) of the bandpass filter is effectively reduced, and the performance, as measured by insertion loss (2.5 dB) and CMRR (> 30 dB), is still acceptable with such a compact area. Most importantly, this full differential bandpass filter is also suitable for SiP applications, as other studies implemented using glass IPD technology have demonstrated.

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“…In [3,4], dual-mode stripline ring resonators and folded coupled-line structure are employed to produce transmission zeros to improve the selectivity of the diplexer. Microstrip diplexers and filters were realized based on modified stepped-impedance resonators [5,6], dual-mode stepped-impedance resonators [7] and defected ground structure [8,9] to achieve good selectivity, high isolation and wide stopband. In [10], a diplexer was proposed by utilizing common resonator sections.…”

Section: Introductionmentioning

confidence: 99%

“…So far, a variety of configurations were proposed to implement diplexers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A well designed diplexer should have compact circuit size, low cost and high performance.…”

Section: Introductionmentioning

confidence: 99%

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

Lin¹,

Zhao²,

Wu³

et al. 2015

PIER Letters

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Abstract-In this paper, a compact quad-channel diplexer utilizing quad-mode stub-loaded resonators (QMSLRs) is proposed. The proposed quad-channel diplexer is composed of two dual-band bandpass filters (BPFs) based on QMSLRs and source-load coupling lines. Due to the symmetry of the proposed quad-mode resonator, its resonance characteristics are analyzed by using the even-odd-mode method twice. All four modes equivalent circuits of the resonator are quarter wavelength resonators, so the circuit size can be very compact, and the first resonance frequencies is three times of the fundamental ones. Stub-to-stub coupling is introduced to split two identical resonance modes, which is in favor of implementing dual-band BPF by using a single quad-mode resonator. By tuning the corresponding physical dimensions of the stubs, the resonant modes can be individually adjusted. The source-load coupling lines are properly designed to provide appropriate external coupling for the passbands and high isolation level between channels. For demonstration, a quad-channel diplexer (0.9/1.2 GHz at Load 1 and 1.5/1.8 GHz at Load 2) using the quad-mode resonator is designed, fabricated and measured. The simulated and measured results with good agreement are presented.

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Design of a High Band Isolation Diplexer for GPS and Wlan System Using Modified Stepped-Impedance Resonators

Cited by 31 publications

References 15 publications

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Very Compact Full Differential Bandpass Filter With Transformer Integrated Using Integrated Passive Device Technology

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

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