What is meant by rhombic antenna?
The Rhombic Antenna is an equilateral parallelogram shaped antenna. Generally, it has two opposite acute angles. The tilt angle, θ is approximately equal to 90° minus the angle of major lobe. Rhombic antenna works under the principle of travelling wave radiator.
What do you mean by principal E & H planes of a linearly polarized antenna?
For a linearly-polarized antenna, this is the plane containing the electric field vector (sometimes called the E aperture) and the direction of maximum radiation. The electric field or “E” plane determines the polarization or orientation of the radio wave.
Why rhombic antenna is non resonant?
The four sides of the rhombic antenna are parallel in shape. It is a non-resonant antenna.
What is unity gain antenna?
Unity gain (2.1 dBi) is a way of describing an antenna that outputs a signal at the same level at which it is input. The broad radiation pattern of unity gain antennas is less likely to be obstructed by buildings, bushland and hilly terrain.
Why rhombic antenna is non-resonant?
What is the main application of helical antenna?
Specialized normal-mode helical antennas are used as transmitting antennas for FM radio and television broadcasting stations on the VHF and UHF bands.
What is RHCP and LHCP antenna?
“LHCP” stands for “left-hand circular polarized,” and “RHCP” stands for “right-hand circular polarized.” A LHCP antenna will produce a left-hand corkscrew pattern from the wire lobes, and a RHCP antenna will produce a right hand pattern.
What is the difference between resonant and nonresonant antenna?
From the radiation patterns of both, the difference between resonant antenna and nonresonant antenna is as follows. ➨Nonresonant antennas are uni-directional and resonant antennas are bi-directional. ➨In nonresonant antennas only forward waves exist and in resonant antennas both forward and reflected waves exist.
What is resonant and non resonant?
In traveling wave antennas, the current and voltage can be represented using traveling waves in the same direction. Traveling wave antennas are non-resonant antennas. Standing wave antennas are bi-directional traveling wave antennas and are otherwise known as resonant antennas.
Is 6.6 dBi good?
A medium gain antenna (6.6, 5.1 dBi) has a more rounded, wider pattern than a high gain antenna. This means the signal is less likely to be obstructed by obstacles such as buildings, trees or mountains. These factors make a medium gain antenna the best choice for those in suburban areas and the country side.
What is the maximum gain of a rhombic antenna?
The maximum gain from a rhombic antenna is along the direction of the main axis, which passes through the feed point to terminate in free space. The polarization obtained from a horizontal rhombic antenna is in the plane of rhombus, which is horizontal.
What is the difference between a rhombic and a horizontal antenna?
The rhombic antenna provides the highest gain along its main axis joining the feed point and terminating end. And the horizontal rhombic antenna provides horizontal polarization. Here as all the major lobes get combined together thus we achieve a unidirectional radiation pattern in one direction only.
What is the power loss of a rhombic antenna?
This power loss is around 35 to 50%. In the same way if despite terminating we kept the ends open then this causes the reflection of the waves back towards the feed point. Thus in case of the rhombic antenna, the losses are almost equivalent in both the cases.
What is the history of the rhombic antenna?
AT 2 wire rhombic in Dixon, California, in 1937, used for telephone service to Shanghai, China. The rhombic antenna was designed in the 1931 by Edmond Bruce and Harald Friis, It was mostly commonly used in the high frequency (HF) or shortwave band as a broadband directional antenna.