What is planar monopole antenna?
What is planar monopole antenna?
Abstract: A planar monopole may be realised by replacing the wire element of a conventional monopole with a planar element. This broadband antenna shows a constant radiation pattern over the impedance bandwidth. …
What is the difference between dipole and monopole antenna?
In essence, the difference between a monopole and dipole antenna, is that a dipole antenna uses an additionally radiator to generate a synthetic ground plane between the symmetric radiator elements, where a monopole antenna requires a physical ground plane.
How does a monopole antenna work?
The monopole is often used as a resonant antenna; the rod functions as an open resonator for radio waves, oscillating with standing waves of voltage and current along its length. Therefore the length of the antenna is determined by the wavelength of the radio waves it is used with.
What is the directivity of a monopole antenna?
The directivity of the quarter wave monopole antenna was found to be 4.6dB which is almost twice 2.43dB of the full- wave loop antenna. Also, the directive gain of the quarter wave monopole antenna was found to be 1.96 dB higher than that of the full-wave loop antenna which was found to be -0.22dBd.
What are the applications of monopole antenna?
Applications – Cellular and cordless telephones, walkie-talkies, CB radios, etc. As Ground Plane Radius R increases, the gain maxima shifts towards lower resonance frequency. Gain and radiation pattern of a monopole antenna on small ground plane (< λ) are similar to that of dipole antenna.
Where is monopole antenna used?
What are the advantages of monopole antenna?
The main advantages of the monopole antenna are omnidirectional pattern in the horizontal plane, easy design procedure and light weight. In recent years the cellular phone handset antennas are required to be of small size, and installed inside the handset in proximity to a large PCB which acts as a ground plane.
How is monopole antenna length calculated?
Use the formula: Length (feet) = 234 / Frequency (MHz). For example, if you intend to operate on 14.2 Megahertz (in the 20-Meter amateur radio band): 234 / 14.2 = 16.5 feet (rounded to nearest 0.1 foot). Your 14.2 MHz quarter wavelength wire monopole ham radio antenna needs to be 16.5 feet in length.
How many radials do I need for a vertical antenna?
Butternut recommends a minimum of 30-60 radials at 65 feet each. Hy-Gain suggests numbers based on a chart similar to Table 1 below. It’s obvious there isn’t a consensus among vertical antenna makers. If you need a number to start, twenty 32-foot radials will give you a workable system with most vertical antennas.
How do you calculate 1 4 wave antenna?
1/4 wave length antenna take 300 and divide by the frequency. So 150 MHz becomes 2 meters, 300 MHz becomes 1 meter, 600 MHz becomes 1/2 meter. Then take the length in meters and multiply by 3.28 to convert to feet (unless you want to remain metric). Take that result and divide by 4 for 1/4 wavelength.
How many ground radials do I need?
The shorter your antenna, the more you need radials. Elevated radials should be electrically 1/4λ long. Four elevated radials can perform as well as an extensive ground radial system, but a greater number is likely to work even better. For a given length of wire, choose more short radials over fewer long ones.
