ANTENTOP- 01- 2015 # 019

Three Element Yagi Antenna for 145- MHz with Rectangle Reflector

By: Yuriy Skutelis, RN3DEK

The antenna has F/B ratio at least 29 dB. It was reached by special form of the reflector. Figure 1 shows design of the antenna. Reflector of the antenna made of aluminum wire in diameter 5- mm. Elements of the antenna made of aluminum tube in diameter 8- mm. Boom of the antenna made from dielectric stuff. Gamma matching used to feed the antenna. It is because "pure" antenna has input impedance close to 40- Ohm. Figure 2 shows design of the gamma matching.

Figure 3 shows input impedance of the antenna. Figure 4 shows SWR of the antenna. Figure 5 shows DD of the antenna.

MMANA File for the Three Element Yagi Antenna for 145- MHz with Rectangle Reflector may be loaded at: http: //

www.antentop.org/019/rectangle_019.htm

Figure 2 Gamma matching

Figure 1 Three Element Yagi Antenna for 145- MHz with Rectangle Reflector

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