At the original articles
published at Radio # 10, 1953, there were described several antennas
for distance receiving TV broadcasting stations. Below it is described
one of those antennas- it is a Rhombic Antenna.†
Rhombic Antenna is easy to make and at the same time has
Antennas are easy to build and at the same time has high gain
and good diagram directivity. However the antennas have some lack.
Such antennas required lots space for installations and need at
least for masts instead one that used to support traditional directional
1 shows design of the
Rhombic Antenna. Rhombic Antenna is a rhomb that hang up horizontally
at the ground. Feeder is connected on to one sharp angle of the
rhomb. Terminated resistor is connected on to far sharp angle
of the rhomb. The resistorís value should be equal to the impedance
of the rhomb at the working frequencies of the antenna. As usual
the value is near 700- Ohm. Working frequencies of the antenna
may have pass band in hundreds megahertz. So using such matched
resistor allows create a super broadband antenna that has impedance
near 700- Ohm at the frequencies window in several hundred megahertz.
gain and high directivity of the rhomb antenna could be explained
by combining gain and diagram directivity of the parts of the
antenna. The antenna consists of four wires with traveling wave.
Figure 2 shows the combination. Each wire has own gain and diagram
Cover Radio #
The gain and diagram directivity depends on ratio the length of the wire
to the working wavelength. So, the summary gain and diagram directivity
depends on the ratio the length of the wire to the working wavelength
and to the sharp angle of the rhomb.