A Compact Forward Coupler Using Coupled Composite Right/Left-Handed Transmission Lines

Hirota, Atsushi; Tahara, Yukihiro; Yoneda, Naofumi

doi:10.1109/tmtt.2009.2034304

Cited by 35 publications

(23 citation statements)

References 9 publications

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“…On the other hand, the employed definitions in (16) for Z S , Z SH and Y SH are still as given in (11), (14) and 15, respectively. The analysis of the new dispersion equation for our new π − T G-NRI TL can be solved for the value of the constant M = 1.…”

Section: New Modified π − T Generalised Nri Tlmentioning

confidence: 99%

“…These TLs have demonstrated very novel electromagnetic properties such as anti-parallel phase and group velocities, non-linear phase dispersion properties. Hence they have been applied in different compact and multi-band RF components such as resonators [7,8], filters [8][9][10], couplers [11,12], power dividers [13] and antennas [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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New π –T generalised metamaterial negative refractive index transmission line for a compact coplanar waveguide triple band pass filter applications

Fouad

Abdalla

2014

IET Microwaves, Antennas & Propagation

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This study presents, for the first time, a novel π − T generalised negative refractive index (NRI) transmission line (TL) configuration. It is innovated for increasing the possible passbands in designing microwave components. It is proved that the proposed transmission line can introduce up to seven passbands for completely unbalanced transmission line condition. The detailed mathematical analysis of that configuration based on the periodic network analysis and equivalent circuit model is introduced. As an application for the novel π − T generalised NRI TL configuration, a new compact triple band coplanar waveguide (CPW) metamaterial filter is introduced. The proposed triple bands CPW filter design steps are introduced and its performance is validated using equivalent circuit model simulation, electromagnetic full wave simulation and experimental measurements. Good agreements between the circuit modelling, electromagnetic full wave simulation and practical measurement results are achieved. All the results confirm that the proposed filter has triple passbands from 900 to 960 MHz, 1.4 to 1.48 GHz and 2.4 to 2.45 GHz. Moreover the filter size is compact whose length is only 12.1% λg at first passbands, 18.2 λg% at second passbands and 31.7 λg% at third passbands.

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Section: New Modified π − T Generalised Nri Tlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New π –T generalised metamaterial negative refractive index transmission line for a compact coplanar waveguide triple band pass filter applications

Fouad

Abdalla

2014

IET Microwaves, Antennas & Propagation

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“…Microstrip directional couplers are easily realised on a standard printed-circuit-board (PCB), but they are not compact due to the quarterwave length of the coupled transmission lines. Several different configurations have been proposed to reduce the physical size of a directional coupler such as by use of artificial transmission lines [2,3], open stubs [4], synthesized coplanar waveguide [5], substrate integrated waveguide [6,7], periodical patterned ground structure [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Directional Coupler Using Complementary Split Ring Resonator and Dumbbell-Like Defected Ground Structure

Nie¹

2016

PIER Letters

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Abstract-A novel microstrip coupled-line directional coupler is proposed in this paper. It is based on the introduction of a complementary split ring resonator and dumbbell-like defected ground structure on the coupled lines to strongly enhance the designed backward coupling. The designed frequency band is from 1.2 to 1.5 GHz. The coupler is fabricated and tested. The insertion loss is less than 3.5 dB. The simulated and measured return losses are better than −13.5 dB, and the isolation is higher than 20 dB across the operating band. The overall size of the coupler is 80 mm × 70 mm, which is about 0.36λ × 0.32λ at the central frequency 1.35 GHz.

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“…The use of patterned ground plane [2], [3] increases the electrical length of the even mode due to the slow-wave effect, but has little effect on the odd mode. The forward coupler based on the composite right/left-handed coupled lines (CRLH CLs) was proposed [4]. However, it was designed for small coupling level, and needs additional impedance transformers for impedance matching.…”

Section: Introductionmentioning

confidence: 99%

A novel compact 3-dB forward-wave directional coupler with periodic capacitive enhancement

Lin

Yen

Hsu

et al. 2012

2012 Asia Pacific Microwave Conference Proceedings

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A compact forward-wave directional coupler using periodic capacitive loadings has been proposed. The phase difference between the even and odd modes can be significantly enlarged, which makes the size of the coupler more compact. A simple equivalent model of the unit cell is developed to predict the electrical lengths and the Bloch impedances for both even and odd modes. A test sample is fabricated on an FR4 substrate. The coupling level of 3.4 dB can be measured at 1.7 GHz with a small electrical length of 0.19 g.

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A Compact Forward Coupler Using Coupled Composite Right/Left-Handed Transmission Lines

Cited by 35 publications

References 9 publications

New π –T generalised metamaterial negative refractive index transmission line for a compact coplanar waveguide triple band pass filter applications

New π –T generalised metamaterial negative refractive index transmission line for a compact coplanar waveguide triple band pass filter applications

A Miniaturized Directional Coupler Using Complementary Split Ring Resonator and Dumbbell-Like Defected Ground Structure

A novel compact 3-dB forward-wave directional coupler with periodic capacitive enhancement

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