Miniaturized Rat Race Coupler With Suppression of Spurious Passband

Kuo, Jen-Tsai; Wu, Jaw‐Ching; Chiou, Yi‐Chyun

doi:10.1109/lmwc.2006.887254

Cited by 125 publications

(90 citation statements)

References 10 publications

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“…2, two cases of one term harmonic suppression, the second and third orders, are plotted together. Note that the series line is independent of the choice of harmonic terms as implied in (5). If the circuit design in [1] takes Equations (5) and (6), its circuit dimension will be more compact and an isolation inductor will be unnecessary.…”

Section: The Proposed Designmentioning

confidence: 99%

“…As defected ground structure (DGS) can provide the same properties as EBG, a Wilkinson power divider using DGS was obtained with size reduction of 90% of the conventional divider and suppression levels of 18 and 16 dBs for the second and third harmonics in [4]. Furthermore, the compact 180 • ring hybrid coupler with EBG perforated on the microstrip transmission line can be found in [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Compact Branch-Line Coupler for Harmonic Suppression

Kim¹,

Kong²

2010

PIER C

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Abstract-This paper presents the modified design that can reject harmonic components in the branch-line coupler. After adding open stubs at the center of branch lines of the traditional design, their new network parameters can be found in order to maintain the conventional function at an operating frequency and suppress its harmonic terms chosen. Experimental results show the second and third harmonic suppressions to be −28.3 and −39.6 dBs, while maintaining its traditional performance at the fundamental frequency.

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Section: The Proposed Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact Branch-Line Coupler for Harmonic Suppression

Kim¹,

Kong²

2010

PIER C

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“…With the growth of wireless communication systems, the rat-race couplers with harmonic suppression are in increasing demand. Nowadays there have been some kinds of harmonic suppression methods applied in the 3 dB rat-race hybrids [3][4][5][6]. It's regret that the characteristic of arbitrary power division ratio isn't considered in these designs.…”

Section: Introductionmentioning

confidence: 99%

A Compact Uniplanar Rat-Race Coupler With Arbitrary Power Division Ratio and Harmonics Suppression

He¹,

Wen²,

Chen³

et al. 2015

PIER Letters

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Abstract-In this paper, a miniaturized planar rat-race coupler is proposed to achieve arbitrary power division ratio and harmonic suppression performance simultaneously. It consists of six enhanced Tshaped line sections. The T-shaped lines can be equivalent to arbitrary electrical length lines rather than the conventional λ/4 lines. The explicit design formulas are derived and the characteristic impedances variations with the freedom variable are discussed. Simulated and experimental results show the harmonic suppression to be over −35 dB, while maintaining the conventional performance at the fundamental frequency. The circuit area of the prototype is only 30.8% of the conventional coupler.

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“…Recently, several design techniques have been reported for size reduction and harmonic suppression, such as rat-race couplers with defected ground structure (DGS) and micro-strip resonant cells [7][8][9][10][11] and branch-line couplers using slow-wave structure [12][13][14]. Wireless communication systems usually require smaller device size in order to meet circuit miniaturization and cost reduction.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

Li²,

Gu³

et al. 2013

PIER C

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Abstract-A compact quadrature hybrid coupler with harmonic suppression using lumped-element band-stop resonator is proposed for bandwidth improvement. Conventionally, harmonic rejection is realized by three band-stop resonators in lumped hybrids. The using of three band-stop resonators realizes better harmonic suppression while exhibiting narrower frequency response. So as to improve operation bandwidth behavior, the number of band-stop resonator applied in the proposed topology is minimized to one. Trading off with acceptable reduction in harmonic rejection, the proposed hybrid enlarges working bandwidth with fewer numbers of lumped devices. Detailed design and theoretical analysis are presented and the expressions of lumped elements with dependence of rejected frequency are obtained. To validate the analysis, three 2.45 GHz couplers are fabricated on an FR-4 printed circuit board. The experimental results exhibit 27.3%, 26.9% and 23.3% operation bandwidth with better than 16 dB, 17 dB, and 21 dB harmonic suppressions at 4.9 GHz, 6.1 GHz, and 7.35 GHz, respectively. Less than 0.8 dB amplitude imbalance and 2 • phase error are achieved for all the three couplers, which are matched well with theoretical analysis.

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Miniaturized Rat Race Coupler With Suppression of Spurious Passband

Cited by 125 publications

References 10 publications

Compact Branch-Line Coupler for Harmonic Suppression

Compact Branch-Line Coupler for Harmonic Suppression

A Compact Uniplanar Rat-Race Coupler With Arbitrary Power Division Ratio and Harmonics Suppression

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

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