Compact Quarter-Wave Resonator and Its Applications to Miniaturized Diplexer and Triplexer

Yang, Tao; Chi, Pei‐Ling; Itoh, T.

doi:10.1109/tmtt.2010.2095029

Cited by 121 publications

(81 citation statements)

References 25 publications

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“…The CRLH quarter-wave type resonator is firstly introduced in [29] to realize a miniaturized diplexer and a miniaturized triplexer. Like any TLs, a CRLH structure is transformed into a resonator when it is open-ended or short-ended.…”

Section: Cpw-based Crlh Quarter-wave Type Resonatorsmentioning

confidence: 99%

Compact Multi-Band Loop Antennas Using CPW-Based CRLH Quarter-Wave Type Resonators

Liu¹,

Feng²

2012

PIER C

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Abstract-In this paper, a novel approach to design compact multi-band loop antennas is proposed. This type of antennas is composed of coplanar waveguide (CPW)-based composite right/lefthanded (CRLH) quarter-wave type resonators, and developed on a vialess single layer. Both size reduction and low frequency ratios have been achieved, profiting from the employment of quarter-wave resonators and the high nonlinearity in the left-handed region of CRLH transmission line (TL) dispersion diagram. A sample prototype operating at three negative modes (1.92/2.15/2.64 GHz) with an overall size of 29 × 21.3 × 1.0 mm 3 was manufactured and measured. Measured results show good agreement with EM simulation, exhibiting good impedance matching as well as stably omni-directional radiation patterns at the three operating modes.

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Section: Cpw-based Crlh Quarter-wave Type Resonatorsmentioning

confidence: 99%

Compact Multi-Band Loop Antennas Using CPW-Based CRLH Quarter-Wave Type Resonators

Liu¹,

Feng²

2012

PIER C

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“…This kind of diplexers, however, usually occupies a considerable footprint due to the required large size from the junction. In [13][14][15][16], the common resonator technology is proposed to remove the input junction in the diplexer designs and reduces the size to a large degree. However, since the passbands of the diplexer rely on the first two resonant frequencies of the common resonator, the common resonator needs to be chosen properly.…”

Section: Introductionmentioning

confidence: 99%

Compact and High Isolation Microstrip Diplexer for Broadband and Wlan Application

Deng

Zhao²,

Fu³

et al. 2013

PIER

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Abstract-In this paper, a compact and high isolation microstrip diplexer is designed for broadband and wireless local area network (WLAN) application, simultaneously. The bandpass filter (BPF) for broadband channel is formed by three-coupled-line structure and two short stubs with different size loaded in 50 Ω feed lines, and the BPF for WLAN channel consists of two coupling quarter-wavelength resonators (QWR) and one open stub loaded in short parallel-coupling feed structure. Multiple transmission zeros can be generated due to their intrinsic characteristics, so the broadband BPF with sharp skirt and wide upper-stopband performance and the WLAN BPF with sharp roll-off and lower-stopband characteristic can be realized. The tapped stub not only can generate new transmission zeros to deepen the stopband, but also can connect other BPF as an its part without deterioration of in-band performance. Hence, a compact microstrip diplexer combines of two BPFs without the extra junction matching network. The mutual loading effect approximately equivalent to a coupled QWR can also generate new transmission zero at the passband edge to improve the isolation. A microstrip diplexer with the 3 dB fractional bandwidths (FBW) of 80% for broadband channel and 5% for WLAN channel is designed and fabricated. Good agreement between the simulated and measured results is observed.

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“…Stopband extension has also been improved by some researchers (Kuo, Fan, & Tang, 2012); though a deep wide stopband is realised, the frequency selectivity of these filters are not good. The properties of composite right-/left-handed transmission line (CRLH-TL) have been studied and applied to various microwave components (Bonache et al, 2004;Kim, Park, & Lee, 2010;Nguyen & Caloz, 2007;Sungtek, Geonho, & Jaume, 2010;Yang, Chi, & Itoh, 2011;Yang, Tamura, & Itoh, 2010). But few works have explained the electric and magnetic couplings of the CRLH-TL unit.…”

Section: Introductionmentioning

confidence: 99%

Dual-band bandpass filter based on mixed electric and magnetic coupling of the hybrid quasi-lumped resonator

Song

Pan

Yang

2013

International Journal of Electronics

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A novel compact dual-band bandpass filter based on mixed coupling of the hybrid quasi-lumped resonator is proposed. The filter is composed of two independent signal paths, each can generate one passband with two identical hybrid quasi-lumped resonators. The proposal combines the mixed electric and magnetic coupling technology with this novel resonator in the filter design. Analysis of the filter has been done with the equivalent circuit method. To validate the approach, a dual-band bandpass filter operating at 2.4/5.2 GHz has been fabricated. Both passbands were realised with mixed coupling. An additional transmission zero is generated at either passband. Final fabricated filter has good band skirt, low insertion loss and good out-of-band performance. Reasonable agreement is found between the calculated, simulated and measured results. The implementation area is 0.21λ g × 0.12λ g .

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Compact Quarter-Wave Resonator and Its Applications to Miniaturized Diplexer and Triplexer

Cited by 121 publications

References 25 publications

Compact Multi-Band Loop Antennas Using CPW-Based CRLH Quarter-Wave Type Resonators

Compact Multi-Band Loop Antennas Using CPW-Based CRLH Quarter-Wave Type Resonators

Compact and High Isolation Microstrip Diplexer for Broadband and Wlan Application

Dual-band bandpass filter based on mixed electric and magnetic coupling of the hybrid quasi-lumped resonator

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