Splash Plate Reflector Antenna with Cylindrical （防溅板与圆柱反射器天线）.pdf

Splash Plate Reflector Antenna with Cylindrical Waveguide Feeder contactus@ This paper presents the procedure for design of splash plate reflector antenna. It contains theoretical consideration and foundation for this kind of antenna, as well as procedure for design in WIPL-D software suite. Splash plate reflector antenna consists of two parts: 1. Feeding cylindrical waveguide (feeder), 2. Splash plate subreflector and main parabolic reflector (reflectors). The design procedure is roughly divided into two steps, each corresponding to the design of one part. After a theoretical consideration, a description on how to make the model in WIPL-D is given for every step. 1. The Design of the Feeder For splash plate reflector type antennas, most often the feeding antenna is chosen to have large beamwidth. In our case we choose open cylindrical waveguide (CWG). The feeder design procedure consists of design of CWG, according to the specified central operating frequency, 1.1. Design of CWG CWG is excited by a probe and how it looks like is shown in Fig. 1. Fig. 1. CWG Cross Section To design CWG we must adopt values for: Awg – waveguide radius, Lwg – waveguide length, Hprobe – probe height, Dprobe – probe to back wall distance. contactus@ The fundamental mode propagating through a cylindrical waveguide is TE mode. The next mode is TM . 11 10 Cut off frequencies for TE and TM modes are given with: 11 10 c Fc(TE11) 0.293