Research of the cutoff characteristic of the dominant mode in ridge-trough waveguides

LI Ying; LU Mai; CHEN Xiao-qiang

Based on the finite-difference format of Helmholz equation,the normal cutoff wavelength of the dominant mode in the ridge-trough rectangle waveguide is calculated under the condition that physical dimensions of the ridge and the trough vary continuously in the middle of the waveguide while the ratio of short side to long side is 0.45 and ration of the height of the trough to the short side is 0.4.Then the normal cutoff wavelength of the single-ridge waveguide is calculated,which is considered as the ridge of the ridge-trough rectangle waveguide disappear for the width of the ridge equals to 0,the space length equals to the short side plus the height of the trough.A conclusion is made that the cutoff characteristic of the ridge-trough waveguide is better than that of a single ridge waveguide or a single-trough wavegide.

Corresponding author: LU Mai, mailusw@gmai1.com;

1. Key Laboratory of Opto-Electronic Technology and Intelligent Control, Lanzhou Jiaotong University, Lanzhou 730070, China

Received Date: 2006-05-31

Accepted Date: 2006-07-17

Available Online: 2007-08-25

Abstract: Based on the finite-difference format of Helmholz equation,the normal cutoff wavelength of the dominant mode in the ridge-trough rectangle waveguide is calculated under the condition that physical dimensions of the ridge and the trough vary continuously in the middle of the waveguide while the ratio of short side to long side is 0.45 and ration of the height of the trough to the short side is 0.4.Then the normal cutoff wavelength of the single-ridge waveguide is calculated,which is considered as the ridge of the ridge-trough rectangle waveguide disappear for the width of the ridge equals to 0,the space length equals to the short side plus the height of the trough.A conclusion is made that the cutoff characteristic of the ridge-trough waveguide is better than that of a single ridge waveguide or a single-trough wavegide.

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Reference (11)

[1]	LU M,LEONARD P J.Design of trapezoidal-ridge waveguide by finite-element method[J].IEE Microwaves Antennas and Propagation Proceedings,2004,151(3):205～211.
[2]	SAAD A M K,MILLER J D,MITHA A et al.Analysis of antipodal ridge waveguide structure and application on extremely wide stopband lowpass filter[A].IEEE Microwave Symposium Digest,MTT-S International[C].Mississauga,Ontario,Canada:MA Electronics Canada,A Division of M/A-COM Inc.,1986.361～363.
[3]	RONG Y,ZAKI K A.Characteristics of generalized rectangular andcircular ridge waveguides[J].IEEE Transactions on Microwave Theory and Techniques,2000,48(2):258～265.
[4]	LU M,LEONARD P J.Dependence of ridge position on the cutoffwavelength of the dominant mode in single ridge waveguides[J].Microwave and Optical Technology Letters,2002,34(5):374～377.
[5]	GUHA D,SAHA P K.Some characteristics of ridge-trough waveguide[J].IEEE Transactions on Microwave Theory and Techniques,1997,45(3):449～453.
[6]	GODSHALK E M.A V-band wafer probe using ridge-troughwaveguide[J].IEEE Transactions on Microwave Theory and Techniques,1991,39(12):2218～2228.
[7]	GODSHALK E M.A W-band wafer probe[A].IEEE MicrowaveSymposium Digest,MTT-S International[C].Beaverton,Oregon:Cascade Microtech Inc,1993.171～174.
[8]	SU J M,DAI J Zh,YANG Y P.Review of the new development of optical waveguide amplifier[J].Laser Technology,2004,28(6):604～608(in Chinese).
[9]	LI F Q.Numerical calculation of electromagnetic fields and design of electromagnets[M].Beijing:Tsinghua University Press,2002.81～87(in Chinese).
[10]	SHENG X Q.The nub of electromagnetic computation[M].Beijing:Science Press,2004.133～134(in Chinese).
[11]	WANG B Zh.Electromagnetic computation[M].Beijing:Science Press,2002.20～21(in Chinese).

Research of the cutoff characteristic of the dominant mode in ridge-trough waveguides

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