Design of Multimode Net-Type Resonators and Their Applications to Filters and Multiplexers

Chen, Chi-Feng; Shen, Tze-Min; Huang, Ting-Yi; Wu, Ruey-Beei

doi:10.1109/tmtt.2011.2109392

Cited by 70 publications

(52 citation statements)

References 24 publications

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“…Despite its large return loss and weak frequency selectivity, a significant reduction in the insertion losses could be seen. Although the low insertion loss at resonance frequency is an important issue, most of the reported triplexers could not reduce it [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These triplexers have been designed using various microstrip structures.…”

Section: Introductionmentioning

confidence: 99%

Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

Rezaei¹,

Noori²

2018

Turk J Elec Eng & Comp Sci

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Abstract:In this paper, a new microstrip triplexer with flexible resonance frequencies is designed based on the properties of coupled lines, steps, and spiral cells. It operates at 2.67 GHz for 4G LTE and at 3.1 GHz and 3.43 GHz for IEEE 802.16 WiMAX. The close resonance frequencies make it suitable for frequency division duplex applications. In order to improve insertion loss, the LC equivalent circuit of the proposed resonator is analyzed. Moreover, careful alignment of the coupled lines and step impedance structures is performed to improve the insertion and return losses so that they are 0.72/0.63/0.81 dB and 24.5/24/24.7 dB, respectively. The frequency response shows good selectivity for each channel.Meanwhile, there are several transmission zeros above the first channel and below the last one that improve the stopband properties. The proposed triplexer is fabricated and measured. The simulation and measurement results are in good agreement, which validates the introduced methodology.

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Section: Introductionmentioning

confidence: 99%

Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

Rezaei¹,

Noori²

2018

Turk J Elec Eng & Comp Sci

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“…The most common approach to realize a diplexer is using two bandpass filters with parallel/cross coupling of single-mode resonators. The notable resonators are open loop resonators, hairpin line resonators, stepped impedance resonators, quarter-wavelength resonators, and hybrid resonators respectively [4][5][6][7][8][9]. Using such resonators, each of the passbands is designed at its fundamental frequency.…”

Section: Introductionmentioning

confidence: 99%

Miniature Triple-Mode Diplexer With Good Selectivity

Tantiviwat¹,

Razalli²,

Ibrahim³

2017

PIER Letters

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Abstract-This paper presents a compact diplexer with high selectivity. The proposed diplexer employs two sets of triple-mode bandpass filters. Using this approach, the pair of even-mode resonant frequencies can be flexibly controlled by adjusting the characteristic impedance or electrical lengths of the two open-circuited stubs while the odd-mode resonant frequency remains at the fundamental resonant frequency. For a demonstration, a diplexer with two passbands centred at 1.50 and 1.70 GHz and the transmission zeros are created close to the passband edges which extremely improve the skirt selectivity. As a result, the proposed diplexer occupies an extremely small area, i.e., approximately 0.30λ g × 0.35λ g . The measured results are in good agreement with the simulated predictions.

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“…In [31], to solve the problem of junction-fed topology, new matching circuits for microstrip triplexers are proposed based on half-wavelength tapped-connected SIRs. In [32], net-type resonators with dual-mode and trimode electrical behaviors have been presented and analyzed theoretically for filter and multiplexer designs. In [33], a microstrip high-isolation triplexer utilizing multimode resonators, SIRs, and distributed coupling technique is proposed.…”

Section: Introductionmentioning

confidence: 99%

Design of Sext-Band Bandpass Filter and Sextaplexer Using Semilumped Resonators for System in a Package

Hsu

2015

IEEE Trans. Compon., Packag. Manufact. Technol.

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In this paper, using semilumped resonators, one sext-band bandpass filter and one sextaplexer are proposed. The two circuits are fabricated using microstrip technology, and the semilumped resonator consists of two identical microstrip lines and a chip inductor at the center. In comparison with conventional half-wavelength uniform resonator, the semilumped resonator is compact and has better control over harmonic frequencies. In addition, the two circuits utilize a distributed coupling technique to integrate bandpass channel filters. This technique has a low loading effect resulting in a high design freedom that is essential for multiband circuits. IndexTerms-Multiband bandpass filters (BPFs), multiplexers, semilumped resonators.

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Design of Multimode Net-Type Resonators and Their Applications to Filters and Multiplexers

Cited by 70 publications

References 24 publications

Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

Miniature Triple-Mode Diplexer With Good Selectivity

Design of Sext-Band Bandpass Filter and Sextaplexer Using Semilumped Resonators for System in a Package

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