RF PREPTECH // GENERAL // EXTRA
Amateur Extra · FCC ELEMENT 4

E9B02

Amateur Extra · FCC Element 4 · answer reveals automatically

EXTRAE9 · Antennas and Transmission Lines
E9B02

What is the front-to-back ratio of the antenna radiation pattern shown in Figure E9-1?

Figure for E9B02
Answer18 dB

Comparing the forward maximum with the response directly behind the antenna in Figure E9-1 gives an 18 dB front-to-back ratio.