A Novel Design for a Circular Waveguide Directional Coupler

Gentili, Gian Guido; Lucci, L.; Nesti, R.; Pelosi, Giuseppe; Selleri, Stefano

doi:10.1109/tmtt.2009.2022886

Cited by 11 publications

(14 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The design of the coupler is based on the design of a circular waveguide directional coupler described in [24], but with the improvement of being able to produce linearly polarized wave with any angle or circular polarization, as opposed to only a linearly polarized wave with fixed angle. The goals are a coupling of around 30 dB in the frequency band from 10 to 18.9 GHz.…”

Section: A Coupler Designmentioning

confidence: 99%

“…Additionally to those methods, a phase retardation plate can be added to produce an extra reference temperature with circular polarization and calibrate fully polarimetric radiometers [18]- [21]. Furthermore, other calibration methods apply the injection of polarized test signals through their components, such as correlated noise calibration standard coupled with directional couplers [22], an injector of reference signals with coaxial probes inserted in a circular waveguide [23], directional couplers [3] or circular waveguide directional coupler [24], [25]. These last two works have demonstrated waveguide couplers using a circular waveguide, nevertheless those directional couplers only allow to inject in the circular waveguide a broadband signal to produce a pure linearly polarized wave with a fixed angle.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double Square Waveguide Directional Coupler for Polarimeter Calibration

Aja

Villa

Fuente

et al. 2019

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

A novel full-band square waveguide coupler design based on directional couplers which couple the TE10 and TE01 orthogonal modes in a square waveguide is presented. This waveguide coupler is aimed at calibration of polarization receivers. This is composed of a pair of rectangular waveguide directional couplers, which are rotated 90º between them and both are coupled to a main square waveguide through each one of the square section walls. The coupler covers the full frequency band from 10 GHz to 18.9 GHz. It has inherent low cross-polarization, which allows to obtain any known elliptically polarized wave at a square waveguide when a signal is applied to the couplers. The fabricated prototype of this coupler exhibits 31 dB of coupling, with flatness of ±3.8 dB and excellent cross polarization better than 50 dB over the whole band.

show abstract

Section: A Coupler Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Double Square Waveguide Directional Coupler for Polarimeter Calibration

Aja

Villa

Fuente

et al. 2019

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…However, most of devices cannot directly measure the power source because they work in small power environment. In [6,7], with the development of industry, directional couplers have different forms and can be widely used in the field of coaxial, strip-line, micro-strip structure because of their high directivity in [8][9][10], but there are only a few studies about waveguide coupler. References [11,12] proposed a new approach to improve the directivity of directional coupler based on Chebyshev coupling aperture.…”

Section: Introductionmentioning

confidence: 99%

Directional Coupler Using Multi-Stage Coupled Structure Theory

Chen¹,

Tong²,

Tian³

et al. 2013

PIER C

View full text Add to dashboard Cite

Abstract-This paper presents a new directional coupler design, which can increase power capacity working with S band. The design concept is based on multi-stage coupled structure. Aim is to increase the size of coupling aperture by reducing the coupling degree of each stage structure. In view of this, multi-stage coupled structure theory is utilized to improve the directivity of directional coupler, coupling flatness and power capacity. According to the derivation of theory, it can be deduced that the sum of the coupling degree of single stage coupling structure is equal to the coupling degree of twostage coupling directional coupler (TSCDC), and the directivity of TSCDC depends on the directivity of the first stage coupling structure. Then, rectangular waveguide two-stage coupled directional coupler is designed and fabricated. The measured results demonstrate fullband from 1.72 to 2.61 GHz with coupling flatness < 0.65 dB and the directivity > 26 dB.

show abstract

“…The material, selected for the waveguide, influences its electrodynamical characteristics. Therefore, the electrodynamical analysis of the waveguides, designed for the use in various microwave devices is essential [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Semi-Automatic Analysis of Gyrotropic Semiconductor Waveguides Using Neural Network

2011

View full text Add to dashboard Cite

This paper focuses on the analysis technique of gyrotropic circular cylindrical semiconductor waveguide by the use of an electrodynamical model. Authors propose the semi-automatic extraction of the dispersion characteristics by the use of single-layer perceptron neural network. The waveguide analysis algorithm consists of four main stages: initialization of system parameters, evaluation of transcendental linear dispersion equation system, extraction of dispersion characteristics and evaluation of the waveguide broad bandwidth. In this paper three types of waveguides (n-InP, n-InSb and p-InP) are analysed using a proposed algorithm. According to the results of analysis, the use of gyrotropic n-InP and p-InP semiconductor, semiconductor-dielectric waveguides are more preferred than to n-InSb waveguides due to their wider broad bandwidth.

show abstract

A Novel Design for a Circular Waveguide Directional Coupler

Cited by 11 publications

References 11 publications

Double Square Waveguide Directional Coupler for Polarimeter Calibration

Double Square Waveguide Directional Coupler for Polarimeter Calibration

Directional Coupler Using Multi-Stage Coupled Structure Theory

Semi-Automatic Analysis of Gyrotropic Semiconductor Waveguides Using Neural Network

Contact Info

Product

Resources

About