Wide-Band Balanced Line Microwave Hybrids

Rehnmark, S.

doi:10.1109/tmtt.1977.1129221

Cited by 35 publications

(14 citation statements)

References 11 publications

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“…Generally, the simplicity of the coupler's structure can be interchanged with the properties. The most common modification of the rat‐race coupler is the circuit presented in , where the 3/4λ‐long transmission‐line section is replaced with an ideal phase inverter allowing for length reduction of a ring to one‐wavelength. Such a circuit has superior phase response since ideal 0/180° differential phase characteristics are obtained.…”

Section: Introductionmentioning

confidence: 99%

“…The only limitation of operational bandwidth of such a coupler is its narrowband impedance match. The solution to this problem has been found by applying multisection impedance transformers . The other variant of the coupler has been investigated in in which an ideal phase inverter has been replaced with a shorted tightly coupled‐line section.…”

Section: Introductionmentioning

confidence: 99%

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Bandwidth improvement of rat-race couplers having left-handed transmission-line sections

Sorocki

Piekarz

Wincza

et al. 2013

Int J RF and Microwave Comp Aid Eng

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A novel broadband rat-race coupler has been investigated. The coupler utilizes an artificial left-handed transmission line section for broadband phase response realization. Moreover, a narrowband model of left-handed section has been shown to prove the couplers equivalent circuit at the center frequency. To broaden the operational bandwidth multisection quarter-wave transformers have been proposed. The exemplary ratrace coupler with two-section impedance transformers has been designed and manufactured.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bandwidth improvement of rat-race couplers having left-handed transmission-line sections

Sorocki

Piekarz

Wincza

et al. 2013

Int J RF and Microwave Comp Aid Eng

View full text Add to dashboard Cite

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“…The increasing demands for mobile and wireless communication systems have driven the need for miniaturization, band-broadening and band-multiplying of the radio frequency (RF), and microwave devices such as power dividers [1][2][3][4][5], phase shifters [6], and couplers [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Rat-race couplers are among the most fundamental building blocks in RF and microwave integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized wide-band rat-race coupler

Taravati

2012

Int J RF and Microwave Comp Aid Eng

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New designs of wide‐band rat‐race couplers are proposed. The wide‐band operation is achieved with the use of the microstrip nonuniform transmission line sections for the branches of the conventional rat‐race coupler. The design formulas are developed using ABCD matrix and the even‐ and odd‐mode analysis. The theoretical analysis has been verified by measurements of the two manufactured wideband rat‐race couplers, one operate within 0.85–1.92 GHz and other within 1.55–3.55 GHz frequency range with the equal normalized characteristic impedance functions. For both fabricated couplers, the isolation parameter is better than 15 dB over a 77% relative bandwidth. Also, it is shown that the designed wide‐band rat‐race coupler can be realized in higher frequency bands with the fixed fractional bandwidth. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE 23: 675–681, 2013.

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“…In order to improve bandwidth, the methods of opposing short-circuit end and twisting-connection form the embryo of phase inverter [2] [3]. Then, the design of arm-impedance, the technique of slow-wave and the usage of lumped elements are studied [4][5][6] to achieve arbitrary power-division ratio or size-reduction.…”

Section: Introductionmentioning

confidence: 99%

Broadband CMOS Gilbert Down-Converter utilizing a low-loss step-impedance rat-race coupler

Wei

Meng

2009

2009 IEEE MTT-S International Microwave Symposium Digest

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-A Broadband Gilbert Down-Converter with stepimpedance rat-race coupler is demonstrated using 0.13 μm standard CMOS technology. The proposed method utilizes higher effective dielectric-constant, phase-inverter and step-impedance techniques simultaneously to make the rat-race coupler more compact (~ 64% reduction) and phase-balanced over a wide operating bandwidth. The down-converter has NF of 16 dB and LO-to-RF isolation of better than 35 dB. The mixer core consumes 2.9 mA at V dd =1.8 V. Index Terms -Rat-race coupler, phase inverter, step impedance, and Gilbert mixer.

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Wide-Band Balanced Line Microwave Hybrids

Cited by 35 publications

References 11 publications

Bandwidth improvement of rat-race couplers having left-handed transmission-line sections

Bandwidth improvement of rat-race couplers having left-handed transmission-line sections

Miniaturized wide-band rat-race coupler

Broadband CMOS Gilbert Down-Converter utilizing a low-loss step-impedance rat-race coupler

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