An antenna has traveling waves that move up and down the
antenna. If we terminate one end of the antenna with a resistance,
while feeding the other, the waves can travel in one direction only.
efficiently over a wide range of frequencies.
a. A half-rombic antenna is similar to an inverted V in shape.
It radiates in a vertical direction.
In figure 72, you see a
comparison of two different half-rombics - one terminated, the other
not. You can see that the advantage of the terminated half-rombic is
are missing in B have combined with the remaining lobes.
terminating resistor is 500 ohms with a power rating of one-half the