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引言在采用矩形口径单喇叭单脈冲馈源系统时,为了使和差矛盾得到较好地解决,需要用高阶模对馈源“和”、“差”初级波瓣进行整形综合。理论上和模使用H_(10)模、EH_(12)模和H_(30)模。方位差模使用H_(20)模和EH_(22)模。俯仰差模使用EH_(11)模和EH_(13)模。但工程设计中为了简单起见常采用H_(10)。模、EH_(12)模、H_(30)模、H_(20)模和EH_(11)模或更少的和差模。模的激励在波导不连续截面处产生,每组模之间的相位关系由相应的几个可调电长度的波导段或喇叭控制。计算模比的公式见文献〔1〕和〔2〕。本文利用波导不连续截面处两边电场和磁场切向分量连续的条件,详细地推导了矩形口径单喇叭、单脈冲多模馈源的模比计算。可供工程设计、计算时参考。
INTRODUCTION In order to make the contradiction between sum and difference better solved, the high order mode needs to be used to shape the primary and secondary lobe of the feed. In theory and mode use H_ (10) mode, EH_ (12) mode and H_ (30) mode. Azimuth differential mode using H_ (20) mode and EH_ (22) mode. Tilt differential mode using EH_ (11) mode and EH_ (13) mode. However, for the sake of simplicity, H_ (10) is often used in engineering design. Mode, EH_ (12) mode, H_ (30) mode, H_ (20) mode and EH_ (11) mode or less and difference mode. The mode excitation is generated at the discontinuous section of the waveguide. The phase relationship between each set of modes is controlled by the corresponding waveguide sections or horns with several adjustable electrical lengths. The formula for calculating the mode ratio is given in [1] and [2]. In this paper, the mode ratio of rectangular single-horn single-pulse multi-mode feed is derived in detail by using the continuous tangential components of electric field and magnetic field on both sides of discontinuous section of waveguide. For engineering design, calculation reference.