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    • 2. 发明申请
    • PLURAL BAND FEED SYSTEM
    • 双层送料系统
    • WO1998007209A1
    • 1998-02-19
    • PCT/US1997013795
    • 1997-08-08
    • L-3 COMMUNICATIONS CORPORATION
    • L-3 COMMUNICATIONS CORPORATIONANDERSON, Bryant, FordBAIRD, Joseph, MarkHARRISON, Douglas, MelvilleDENERIS, Charles, AndrewGARTSIDE, Paul, JohannFISHER, Friedrich, J.YAMAMOTO, Mark, Johnathon
    • H01Q13/00
    • H01Q19/08H01Q5/47H01Q13/02
    • A feed system for an antenna has a set of inner and outer coaxial waveguides (70, 66) which apply, respectively, both higher and lower frequency radiations to a common radiating aperture provided by a horn (68) and a shroud (62) which envelopes radiating apertures of the individual feed waveguides. Each of the feed waveguides carries signals having a bandwidth of an octave. Lower frequency radiation to be transmitted by the outer coaxial feed waveguide is applied thereto by a set of four waveguides (74) of a launcher (72) which launches a wave with a desired propagation mode into the outer feed waveguide. Impedance matching rings (160) are slidable within the space between the inner and outer surfaces of the coaxial waveguide for development of a desired standing wave ratio for accurate generation of a desired beam pattern. A dielectric rod (144) is disposed in a forward end of the tube of the inner feed waveguide and protrudes therefrom into the horn for shaping a beam of the higher frequency radiation.
    • 用于天线的馈电系统具有一组内部和外部同轴波导(70,66),其分别将高频和低频辐射施加到由喇叭(68)和护罩(62)提供的公共辐射孔 信封辐射各个馈电波导的孔。 每个馈送波导传送具有八度音阶带宽的信号。 由外部同轴馈电波导传输的较低频率的辐射由发射器(72)的一组四个波导(74)施加到发射器(72)上,发射器(72)将具有期望的传播模式的波发射到外部馈电波导中。 阻抗匹配环(160)可以在同轴波导的内表面和外表面之间的空间内滑动,以形成期望的驻波比,从而精确地产生期望的波束图案。 介电棒(144)设置在内馈电波导的管的前端,并从其中突出到喇叭中,以形成较高频辐射的波束。