Optimum Design of Stepped Transmission-Line Transformers

Cohn, S.B.

doi:10.1109/tmtt.1955.1124940

Cited by 152 publications

(45 citation statements)

References 3 publications

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“…We have shown how to design loads, filters and attenuators using a variation of broadband matching [1,2], where π/2 smooth lines were replaced by π/2 loaded cells. At higher order modes, smooth π/2 sections are too dispersive.…”

Section: Discussionmentioning

confidence: 99%

“…To obtain a wide bandwidth, the matching is based on a well known design [1,2], which stipulates π/2 line lengths whose impedances vary so that the input reflection coefficient, Γ in , is a Butterworth or a Tchebychev polynomial. In our design, the matching π/2 transmission-line lengths are replaced by π/2 phase advance disk-loaded cells and their characteristic impedance is replaced by the travelling wave impedance, defined as…”

Section: Disk-loaded Matching Section Theorymentioning

confidence: 99%

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TE_01 High Power Disk Loaded Guide Load

Farkas¹

2005

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A method to design a matching section from a smooth guide to a disk-loaded guide, using a variation of broadband matching, [1, 2] is described. Using this method, we show how to design high power loads, attenuators and filters. The load consists of a disk-loaded coaxial guide operating in the TE 01 -mode. We use this mode because it has no electric field terminating on a conductor, has no axial currents, and has no current at the cylinder-disk interface. A high power load design that has -35 dB reflection and a 200 MHz, -20 dB bandwidth, is presented. It is expected that it will carry the 600 MW output peak power of the pulse compression network. We use coaxial geometry and stainless steel material to increase the attenuation per cell.

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Section: Discussionmentioning

confidence: 99%

Section: Disk-loaded Matching Section Theorymentioning

confidence: 99%

TE_01 High Power Disk Loaded Guide Load

Farkas¹

2005

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“…Two quarterwave impedance transformers have been connected to both the input and output ends to facilitate impedance matching with external 50 Qi measuring systems. The design procedure is based on a formulation proposed by Cohn [33] for an approximate 4 synthesis of distributed stepped-impedance transformers.…”

Section: Amentioning

confidence: 99%

Confirmation of Slow-Waves in a Crosstie Overlay Coplanar Waveguide and Its Application to Band-Reject Gratings and Reflectors.

Wang¹,

Itoh²

1988

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“…Since the line length is exactly quarter wavelength at the center frequency, the operating bandwidth of the power divider is limited in terms of return loss and isolation. Multiple quarter-wave transformers connected in cascade improve the bandwidth [2][3][4] at the cost of increasing the size of the circuit. However, ripples were observed in the transmission coefficient due to discontinuities at impedance steps.…”

Section: Introductionmentioning

confidence: 99%

Ultra Wideband Power Divider Using Tapered Line

Chiang¹,

Chung²

2010

PIER

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Abstract-A power divider with ultra-wideband (UWB) performance has been designed. The quarter-wave transformer in the conventional Wilkinson power divider is replaced by an exponentially tapered microstrip line. Since the tapered line provides a consistent impedance transformation across all frequencies, very low amplitude ripple of 0.2 dB peak-to-peak in the transmission coefficient and superior input return loss better than 15 dB are achieved over an ultra-wide bandwidth. Two additional resistors are added along the tapered line to improve the output return loss and isolation. Simulation performed using CST Microwave Studio and measured results confirm the good performance of the proposed circuit. The return loss and the isolation between the output ports are better than 15 dB across the band 2-10.2 GHz. Standard off-the-shelf resistance values can be selected by optimizing the physical locations to mount the resistors. Better performance can be achieved with more isolation resistors added. Hence, the number of isolation resistors to be used may be selected based on the desired bandwidth and level of isolation and return loss specifications.

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Optimum Design of Stepped Transmission-Line Transformers

Cited by 152 publications

References 3 publications

TE_01 High Power Disk Loaded Guide Load

TE_01 High Power Disk Loaded Guide Load

Confirmation of Slow-Waves in a Crosstie Overlay Coplanar Waveguide and Its Application to Band-Reject Gratings and Reflectors.

Ultra Wideband Power Divider Using Tapered Line

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