直線振子和V形振子的時(shí)域輻射特性
THE TIME DOMAIN RADIATION CHARACTERISTICS OF DIPOLES AND V ANTENNAS
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摘要: 本文用時(shí)間步進(jìn)法求解線天線的時(shí)域積分方程,計(jì)算分析了直線振子和V形振子的時(shí)域輻射特性。分析了饋源位置、加載大小對(duì)振子輸入電流及遠(yuǎn)區(qū)輻射場(chǎng)的影響。對(duì)V形振子的長(zhǎng)度及張角等參數(shù)作了優(yōu)化,找到了獲得前向輻射場(chǎng)強(qiáng)最大瞬時(shí)沖擊值的結(jié)構(gòu)參數(shù),結(jié)果可供此類天線的設(shè)計(jì)參考。Abstract: The time domain radiation characteristics of dipoles and V antennas are obtained by solving the time domain electric field integrodifferential equation with the time-stepping approach. The effects of positions of the feeding source, the amounts of distributed loading along the antennas and the lengths and angles of V antennas on the input urrents and far field radiation characteristics are analyzed. The results obtained show that the appropriats amounts of distributed loading will yield a far field waveform that exhibits a time limited characted, that the deviation of the feeding source will reduce the maximum instant field intensities, and that in order to obtain the maximum instant field intensities in the certain direction, the optimum design for the parameters, such as length and angle, of V antennas is needed.
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E. P. Saye, R. F. Harrington, Appl. Sci. Res., 26(1972), 413-433.[2]R. Mittra, Integral Equation Method for Transient Scattering, in Transient Electromagnetic Fields, Edited by L. B. Felsen, Springer-Verlag, Berlin, Heidclberg, New York, 1976.[3]C. L. Bennett, The Numerical Solution of Transient Eletromagnetic Scattering Problems, in Ellectromagnetic Scattering, Edited by P.L. E. Uslenghi, Academic Press, Inc., 1978.[4]D. L. Sengupta, C.T. Tai, Radiation and Reception of Transients by Linear Amennas, in Transient Electromagnetic Fields, Edited by L. B. Felsen, Springer-Verlag, Berlin, Heidelberg, New York, 1976.[5]Sun Nai-hua, Time Domain Radiation Characteristics of Simple Wire Antenna Arrays, in Proceedings ofIEEE AP-S/URSI 1989 Symposium, 1989.[6]A. J. Poggio, E. K. Miller, 三維散射問(wèn)題的積分方程解法,計(jì)算機(jī)技術(shù)在電磁學(xué)中的應(yīng)用,R.米特拉編著,金元松譯,人民郵電出版社,1983年. -
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