Criteria for the Design of Loop-Type Directional Couplers for the L Band

Schwartz, Richard F.; Kelly, Patricia J.; Lombardini, P. P.

doi:10.1109/tmtt.1956.1125068

Cited by 17 publications

(2 citation statements)

References 7 publications

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“…The main purpose from using two secondary arms is to provide a forward coupling (60 dB) and a reverse coupling (40 dB) as the forward signal power level is always much higher than the reverse one. Loop coupler is considered among the weak coupling structures, where it consists of two dissimilar guiding structure (waveguide and coaxial line) coupled through a coupling hole [33]- [35]. The primary arm, which is carrying most of the signal power is entitled the main arm.…”

Section: Compact Waveguide Loop Coupler Designmentioning

confidence: 99%

Full Band Compact Power Arm Subsystem With High Directive Sample

et al. 2020

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An output arm is the first subsystem in the microwave components chain connected immediately after the power amplifier. These arms are responsible for transferring the signal from the output port of the power amplifier to the standard line of the system. The second objective is to obtain directive samples for both forward and backward signals. The typical design process for such a subsystem is carried out through the design of separate components, independently. This limits the achievable performance of the entire system and introduces excessive losses at intermediate flanges. In this work, we present a novel approach to design such a subsystem using a global optimization procedure. Specifically, we address both compactness and full-band operation of output arms deployed in radar applications. Analysis and design of each component in the proposed subsystem are illustrated.The presented subsystem achieves a deep matching level of 19 dB within an overall length below 2λ g . Moreover, the directive sample obtained through the presented design has an ultra-flat response of 20 dB ± 0.5 dB over the entire band of operation, while the directivity of the samples exceeds 18 dB. The measured results of the fabricated prototype have an excellent agreement with the simulations.

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Section: Compact Waveguide Loop Coupler Designmentioning

confidence: 99%

Full Band Compact Power Arm Subsystem With High Directive Sample

et al. 2020

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“…It provides limitations such as mismatching, lowering of bandwidth and maximizes power handling capability etc. [17][18][19][20]. This introduces the complexity in the development of broadband high power directional coupler in the RF range.…”

Section: Introductionmentioning

confidence: 99%

Design and development of high power variable dual‐directional radio frequency coupler

Jain

Yadav

Kumar

2019

IET Microwaves, Antennas & Propagation

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Design and development of coaxial line‐based 10–40 dB variable loop type dual‐directional coupler for the frequency range of 50–500 MHz for 2 kW power handling capability has been presented in this study. The directional coupler has to be used in the radio frequency plasma experiment to detect the reflected power, so as to safeguard the system from unwanted reflected power. It consists of a main coaxial transmission line with two similar movable loop type coupling arrangements. The movable loops provide variable coupling for forward and reflected power separately, where the magnitude of coupling can be selected independently both for forward and reflected wave. The developed coupler has been tested where test results show return loss and isolation better than −10 dB and coupling from − 10 to − 40 dB in the frequency range of 50–500 MHz.

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