Novel Schiffman phase shifters

Quirarte, J.L.R.; Starski, J.P.

doi:10.1109/22.210223

Cited by 165 publications

(86 citation statements)

References 5 publications

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“…So, a phase shifter with a broadband stability phase differential and low insertion loss is required for practical applications, and this can be achieved using various approaches. The Schiffman phase shifter and its improvements, which rely on edge-coupled transmission lines, are classical designs [2,3]. However, they always take up more areas.…”

Section: Introductionmentioning

confidence: 99%

Planar Ultra-Wideband Phase Shifter Using a Novel Type of Artificial Transmission Line

Geng¹,

Wang²,

Zong³

2015

PIER C

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Abstract-An ultra-wide band 45 • phase shifter based on a new planar artificial transmission line which can be used for UWB communication systems is presented. The planar artificial transmission line is composed of host line, grounded interdigital capacitors and meandered-line inductors. The phase shifter was measured to have a bandwidth about 114.7% (2.9 GHz to 10.7 GHz) for a maximum phase deviation of 2.9 • , a maximum insertion loss of 1.2 dB, a minimum return loss of 13 dB and a compact size of 16.35 mm × 5.2 mm.

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Section: Introductionmentioning

confidence: 99%

Planar Ultra-Wideband Phase Shifter Using a Novel Type of Artificial Transmission Line

Geng¹,

Wang²,

Zong³

2015

PIER C

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“…[2], [3] . 쉬프만 위상천이기에서 광대역의 특성을 얻기 위해서 는 결합 선로의 결합계수 즉 우(evne) 모드와 기(odd) 모 드 임피던스 비()를 높여야 한다 [2], [3] . 일반적으로 결합 계수가 높은 결합선로를 구현하기 위해서는 우 모드의 임피던스가 기 모드 임피던스보다 크고, 두 임피던스의 차가 커야 한다.…”

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Broadband 90° Schiffman Phase Shifter with Vertically Installed Coupled Lines

Rhee¹

2014

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, an broadband Schiffman phase shifter is proposed using vertically installed coupled lines. It consists of the typical coupled lines and a extra coupled lines which is installed vertically on the original coupled lines plane. Phase responses of Schiffman phase shifter with vetically installed coupled lines are analyzed in consideration of the phase velocity of two independent transmission modes and the characteristic impedances. The 90° Schiffman phase shifters with high impedance ratio is realized at 2.4 GHz, which cannot be implemented with the conventional coupled lines. The measured results show that the bandwidth is 1.5～3.2 GHz(70.8 %) within the phase errors ±5°. The measured return loss is found to be better than 12.4 dB and insertion loss is less than 1.2 dB over the operating frequency band.

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“…However, phase velocity difference in microstrip line structure is a crucial disadvantage; it was compensated by using extra stepped impedance structure in [3]. Several improved structures have been described in [4,5,6]. Until now, S-Type section without any extra compensation structure has not been discussed in microstrip line structure.…”

Section: Introductionmentioning

confidence: 99%

“…It is a basic passive microwave component and widely used in wireless communication systems. Schiffman-type (S-type) section [2,3,4,5,6] is a well-known technology for miniaturization. It was firstly discussed in [2] under stripline structure.…”

Section: Introductionmentioning

confidence: 99%

Accurate Schiffman-type section design approach for microstrip line Wilkinson power divider

Wang

Ohira

2016

IEICE Electron. Express

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In this paper, a novel accurate Schiffman-type (S-type) section design approach is presented for microstrip line Wilkinson power divider. S-type section replaces straight 90°transmission line with compact circuit size and easy fabrication, isolation condition between two output ports is also maintained in microstrip line structure. Mathematical equations for S-type section are derived from even-and odd-mode equivalent circuit analysis, and several selected examples have been proved that: through adjusting the evenand odd-mode characteristic impedances and their electrical lengths of S-type section, proposed Wilkinson power divider provides perfect matching in microstrip line structure; in other words, S-type section could provide selfcompensation in microstrip line structure, no extra compensation structure is needed. In experiment, one circuit was fabricated, and experimental results showed good agreement with theoretical results.

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Novel Schiffman phase shifters

Cited by 165 publications

References 5 publications

Planar Ultra-Wideband Phase Shifter Using a Novel Type of Artificial Transmission Line

Planar Ultra-Wideband Phase Shifter Using a Novel Type of Artificial Transmission Line

Broadband 90° Schiffman Phase Shifter with Vertically Installed Coupled Lines

Accurate Schiffman-type section design approach for microstrip line Wilkinson power divider

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