Compact rat‐race ring coupler with capacitor loading

Shao, Wei; He, Jun; Wang, Bing‐Zhong

doi:10.1002/mop.24823

Cited by 27 publications

(20 citation statements)

References 7 publications

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“…The rat-race coupler topology proposed by Wei Shao et al [14] was similar to one reported by Jen-Tsai Kuo et al [15] in great part. As Figure 10(b) illustrates, there is no obvious slot and thin stub in the ring resonator.…”

Section: Harmonic Suppressionmentioning

confidence: 81%

“…Completely different from the principles of [12] and [13], capacitive loading [14] was proposed instead of a periodic stepped-impedance ring resonator [15] to synthesize a compact rat-race coupler with harmonic suppression. As Figure 10(a) illustrates, six flabelliform patches are located inside the open area of the ratrace coupler and are connected to a high-impedance TL through a short, thin stub.…”

Section: Harmonic Suppressionmentioning

confidence: 99%

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Microstrip Rat-Race Couplers

Wang

Lan

2011

IEEE Microwave

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Section: Harmonic Suppressionmentioning

confidence: 81%

Section: Harmonic Suppressionmentioning

confidence: 99%

Microstrip Rat-Race Couplers

Wang

Lan

2011

IEEE Microwave

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“…Up to date, numerous approaches have been developed for compact RRCs, e.g., using capacitor [13] and periodic slow-wave loading [14], using periodic stepped-impedance ring resonators [15], T-shaped photonic bandgap (PBG) structures [16] and fractal strategy [17][18][19]. Although above RRCs feature compact, the lack of dual band (DB) performances deserves further improvements.…”

Section: Dual Band Rat-race Couplermentioning

confidence: 99%

Compact Metamaterials Induced Circuits and Functional Devices

Xu¹,

Wang²,

Cai³

et al. 2017

Metamaterials - Devices and Applications

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In recent years, we have witnessed a rapid expansion of using metamaterials to manipulate light or electromagnetic (EM) wave in a subwavelength scale. Specially, metamaterials have a strict limitation on element dimension from effective medium theory with respect to photonic crystals and other planar structures such as frequency selective surface (FSS). In this chapter, we review our effort in exploring physics and working mechanisms for element miniaturization along with the resulting effects on element EM response. Based on these results, we afford some guidelines on how to design and employ these compact meta-atoms in engineering functional devices with high performances. We found that some specific types of planar fractal or meandered structures are particularly suitable to achieve element miniaturization. In what follows, we review our effort in Section 1 to explore novel theory and hybrid method in designing broadband and dual band planar devices. By using single or double such compact composite right-/left-handed (CRLH) atom, we show that many microwave/RF circuits, i.e., balun, rat-race coupler, power divider and diplexer, can be further reduced while without inducing much transmission loss from two perspectives of lumped and distributed CRLH TLs. In Section 2, we show that a more compact LH atom can be engineered by combining a fractal ring and a meandered thin line. Numerical and experimental results demonstrate that a subwavelength focusing is achieved in terms of smooth outgoing field and higher imaging resolution. Section 3 is devoted to a clocking device from the new concept of superscatterer illusions. To realize the required material parameters, we propose a new mechanism by combining both electric and magnetic particles in a composite meta-atom. Such deep subwavelength particles enable exact manipulation of material parameters and thus facilitate desirable illusion performances of a proof-of-concept sample constructed by 6408 gradually varying meta-atoms. Finally, we summarize our results in the last section.

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“…In [3], though great size reduction was achieved and the band-rejection response was wide, the lower harmonic suppression should be further improved and the depth of harmonic suppression was merely below −15 dB in the stopband. In [4], the harmonic suppressed was very limited, just the second and third. In order to achieve great size reduction and harmonic suppression, simultaneously, a new low-pass filter (LPF) unit cell (LUC) is integrated into rat-race coupler design.…”

Section: Introductionmentioning

confidence: 99%

“…Some authors [1,2] dedicated themselves into the size reduction research, but the importance of the harmonic suppression was ignored. To realize both harmonic suppression and size reduction, some attempts [3,4] were made. In [3], though great size reduction was achieved and the band-rejection response was wide, the lower harmonic suppression should be further improved and the depth of harmonic suppression was merely below −15 dB in the stopband.…”

Section: Introductionmentioning

confidence: 99%

A harmonic suppression and size-reduced rat-race hybrid coupler using dual coupled-lines

Song

Deguchi

Tsuji

2012

IEICE Electron. Express

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Abstract:A newly proposed coupled-line low-pass filter structure is firstly integrated into rat-race coupler design in this paper for size reduction and harmonic suppression. This low-pass filter is composed of dual parallel coupled-lines with one open stub at the end. By properly substituting this low-pass filter unit cell (LUC) for each one of the six λ/4 sections in the conventional rat-race coupler, significant size reduction and harmonic suppression can be achieved while the property of this proposed coupler remains comparable to the conventional one for the passband (f 0 = 0.9 GHz) with 33% relative size. Transmission is suppressed below −20 dB from 2.5 GHz to 5.6 GHz, including the third, fourth, fifth and sixth harmonics.

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Compact rat‐race ring coupler with capacitor loading

Cited by 27 publications

References 7 publications

Microstrip Rat-Race Couplers

Microstrip Rat-Race Couplers

Compact Metamaterials Induced Circuits and Functional Devices

A harmonic suppression and size-reduced rat-race hybrid coupler using dual coupled-lines

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