ANTENTOP- 01- 2012, # 016

Ground Plane for AVIA Band

The publication is devoted to the memory of R0GT.

Credit Line: Forum from:

www.cqham.ru

By: Nikolay Kudryavchenko, UR0GT

Some receivers for AVIA-Band (118- 136- MHz) are designed for 75- Ohm -antennas. Below described simple Ground Plane antenna for the band that has input impedance 75-Ohm at good SWR on 118- 136- MHz.

The Ground Plane antenna has capacitive load at the antenna base. Due to the load antenna has input impedance close to the 75- Ohm and very broad pass band. Using such method it is possible to design broad band antennas for other frequency ranges.

Figure 1 shows design of the antenna. Figure 2 shows impedance of the antenna (antenna placed at 8- meter above the real ground). Figure 3 shows SWR of the antenna (antenna placed at 8- meter above the real ground). Figure 4 shows DD of the antenna (antenna placed at 8- meter above the real ground).

Standard antenna mast for AVIA antennas in Russia has height 8- meter.

The MMANA model of the Ground Plane for AVIA Band may be loaded: http: // www.antentop.org/016/avia_016.htm

Figure 1 Design of the Ground Plane for AVIA Band

www.antentop.org

Page-65