A Wideband Stripline Hybrid Ring (Correspondence)

March, S.L.

doi:10.1109/tmtt.1968.1126693

Cited by 122 publications

(67 citation statements)

References 1 publication

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“…2, the stepimpedance structure consists of a higher-impedance ( High Z ) section and two lower-impedance ( Low Z ) sections. The ABCD matrix of the step-impedance section for the lossy condition is described in (2). As the ratio of / High Low Z Z increases, the shorter total length ( 2 L H l l + ) can be achieved.…”

Section: Circuit Designmentioning

confidence: 99%

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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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Section: Circuit Designmentioning

confidence: 99%

“…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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“…The λ/4-coupled line section with diametrically opposing ends shortcircuited can approximate a phase-reversing network referred to a λ/2-TL and has a bandwidth of 50% and 180 ± 10 • phase shift. But the line space is too narrow to fabricate with standard microstrip process [1]. The λ/4-microstrip (MS)-to-coplanar waveguide (CPW) broadside-coupled structure [2] has an identical property to that in [1].…”

Section: Introductionmentioning

confidence: 99%

Microstrip Phase Inverter Using Interdigital Strip Lines and Defected Ground

Zhang¹,

Liang²,

Xie³

2012

PIER Letters

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Abstract-A new wide-band microstrip phase inverter is reported in this paper. Interdigital striplines, defected ground and via holes are used to obtain 180 • phase shift. The structure is simple and can be realized with ordinary microwave integrated circuit (MIC) fabrication process. The bandwidth is enhanced largely. A lumped-element model of the phase shifter is devised. The fabricated phase inverter has a bandwidth of 105.6% (2.065-6.682 GHz), with 1 dB insertion loss and a phase deviation less than 10 • .

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“…Various types of 180 • hybrids based on transmission lines have been widely used on broadband mixer applications, because of their reduced cost and simplicity [1][2][3][4]. However, their limited isolation figure of 20 or 30 dB, generally narrow bandwidth operation, and large occupied surface in relatively low frequencies are a number of limitations to be overcome in ultra-broadband applications, such as UWB.…”

Section: Introductionmentioning

confidence: 99%

High-Isolation and Wide-Band 180º Hybrids Based on Electronically Tunable Lumped-Element Filters

Gurutzeaga¹,

Insausti²,

Celayeta³

et al. 2012

PIER Letters

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Abstract-A new high isolation lumped-element 180 • hybrid, using electronically adjustable filters with varactor diodes, are proposed. This design is very simple and based on only two configurable low order (N = 2) filters. Due to the limited tuning frequency range of varactor diodes, maximum near-octave frequency coverage of 2.5-5 GHz was planned in the high isolation hybrid. An impressive simulated typical isolation in the range of > 60 dB was achieved. One of the typical applications of developed hybrids could be the conversion of 70 MHz IF to microwave frequencies, with broadband mixers in single-conversion converters and very high LO rejection (> 60 dB).

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A Wideband Stripline Hybrid Ring (Correspondence)

Cited by 122 publications

References 1 publication

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

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

Microstrip Phase Inverter Using Interdigital Strip Lines and Defected Ground

High-Isolation and Wide-Band 180º Hybrids Based on Electronically Tunable Lumped-Element Filters

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