A novel design tool for waveguide polarizers

Virone, G.; Tascone, R.; Baralis, M.; Peverini, O. A.; Olivieri, A.; Orta, Renato

doi:10.1109/tmtt.2004.842491

Cited by 46 publications

(23 citation statements)

References 13 publications

(28 reference statements)

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“…The total transformation made by the RBFNN is shown in the following equation: (1) where is a nonlinear function. The nonlinear function is the Gaussian function just mentioned, described as follows: (2) and the variance values are cast in the following matrix:…”

Section: Proposed Methods For Nn Modelmentioning

confidence: 99%

“…Nowadays, the industry demands useful tools for the design of microwave circuits with complex elements, which can operate at high frequencies, and with metallic walls surrounding the structures. Not only is accuracy in the calculation of the electrical behavior needed, but also fast computational times are desired in order to build useful computer-aided-design (CAD) packages [2]. The approximate analysis techniques or quasi-static approaches can provide estimated results for simple structures in a fast way, but generally they do not achieve the analysis precision demanded nowadays for complex circuits.…”

Section: Introductionmentioning

confidence: 99%

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A neural network method for the analysis of multilayered shielded microwave circuits

García

Pereira

Rebenaque

et al. 2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

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Abstract-In this paper, a neural-network-based method for the analysis of practical multilayered shielded microwave circuits is presented. Using this idea, a radial basis function neural network (RBFNN) is trained to approximate the space-domain multilayered media boxed Green's functions used in the integral-equation (IE) method. Once the RBFNN has been trained, the outputs of the neural network (NN) replace the exact Green's functions, during the numerical solution of the IE. The computation of the RBFNN output values is very fast in comparison with the numerical methods used to calculate the exact Green's functions. This paper describes two novel strategies for efficiently training the RBFNN. In the first strategy, the input space of the RBFNN is divided into several spatial and frequency regions. The spatial subdivision is extended for the first time to both observation and source regions. In addition, the subdivision of the observation points regions is applied in a novel manner to the whole cross section of the metallic box. The second strategy combines the above region subdivision with an adaptive selection of the neurons variances in each region. The accuracy and the computational gain achieved with the NN method proposed makes possible the implementation of computer-aided-design tools that can be used for the analysis and design of integrated shielded microwave circuits (e.g., monolithic microwave integrated circuit devices) on a real-time basis.Index Terms-Computer-aided design (CAD), multilayered circuits, multilayered Green's functions, neural networks (NNs), printed circuits, radial basis function neural network (RBFNN), shielded microwave circuits.

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Section: Proposed Methods For Nn Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A neural network method for the analysis of multilayered shielded microwave circuits

García

Pereira

Rebenaque

et al. 2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

View full text Add to dashboard Cite

show abstract

“…The transformation of circular polarization with linear polarization is generally realized by loading the discontinuities of a steppedseptum [3][4][5][6][7][8], stepped-corrugations [9][10][11][12], grooves [13] and loaded dielectrics [14,15].…”

Section: Introductionmentioning

confidence: 99%

Novel Compact Waveguide Dual Circular Polarizer

Chang¹,

Tantawi²,

Church³

et al. 2013

PIER

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Abstract-A novel type of dual circular polarizer for simultaneously receiving and transmitting right-hand and left-hand circularly polarized waves is developed and tested. It consists of a H-plane T junction of rectangular waveguide, one circular waveguide as an Eplane arm located on top of the junction, and two metallic pins used for matching. The theoretical analysis and design of the three-physicalport and four-mode polarizer were researched by solving ScatteringMatrix of the network and using a full-wave electromagnetic simulation tool. The optimized polarizer has the advantages of a very compact size with a volume smaller than 0.6λ 3 , low complexity and manufacturing cost. A couple of the polarizer has been manufactured and tested, and the experimental results are basically consistent with the theories.

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“…The circular polarizer is usually designed to convert one linearly polarized mode into two orthogonal modes with a 90-degree phase shift by loading the discontinuities of septum [3][4][5], corrugations [6][7][8][9], dielectrics [10,11]. The waveguide septum polarizer has the advantage of compact size with three physical ports, but has a very limited bandwidth duo to phase shift of two orthogonal modes [12]; the dielectric-loaded polarizer has relative high loss.…”

Section: Introductionmentioning

confidence: 99%

Theory and Experiment of a Compact Waveguide Dual Circular Polarizer

Chang¹,

Church²,

Tantawi³

et al. 2012

PIER

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Abstract-A new compact and wide-band waveguide dual circular polarizer at Ka-band is presented and tested in this paper. This compact structure is composed of a three-port polarizing diplexer and a circular polarizer realized by a simple pair of large grooves. The polarizing diplexer includes two rectangular waveguides with a perpendicular H-plane junction, one circular waveguide coupled in Eplane. A cylindrical step and two pins are used to match this structure. For a LHCP or RHCP wave in the circular port, only one specific rectangular port outputs power and the other one is isolated. The accurate analysis and design of the circular polarizer are conducted by using full-wave electromagnetic simulation tools. The optimized dual circular polarizer has the advantage of compact size with a volume smaller than 1.5λ 3 , broad bandwidth, uncomplicated structure, and is especially suitable for use at high frequencies such as Ka-band and above. The prototype of the polarizer has been manufactured and test, the experimental results are basically consistent with the theories.

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A novel design tool for waveguide polarizers

Cited by 46 publications

References 13 publications

A neural network method for the analysis of multilayered shielded microwave circuits

A neural network method for the analysis of multilayered shielded microwave circuits

Novel Compact Waveguide Dual Circular Polarizer

Theory and Experiment of a Compact Waveguide Dual Circular Polarizer

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