What is antenna theory?
Table of Contents
What is antenna theory?
The fundamentals of antenna theory requires that the antenna be “impedance matched” to the transmission line or the antenna will not radiate. The concept of VSWR is introduced as a measure of how well matched an antenna is. Bandwidth. The bandwidth of an antenna is the frequency range over which the antenna radiates.
How do slot antennas work?
A slot antenna consists of a metal surface, usually a flat plate, with one or more holes or slots cut out. When the plate is driven as an antenna by an applied radio frequency current, the slot radiates electromagnetic waves in a way similar to a dipole antenna.
How do PIFA antenna work?
The Planar Inverted-F Antenna (PIFA). The PIFA is resonant at a quarter-wavelength due to the shorting pin at the end. We’ll see how the resonant length is defined exactly in a minute. The feed is placed between the open and shorted end, and the position controls the input impedance.
What are the basic parameters of antenna?
Antenna Theory – Basic Parameters
- Frequency.
- Wavelength.
- Impedance matching.
- VSWR & reflected power.
- Bandwidth.
- Percentage bandwidth.
- Radiation intensity.
What is the difference between slot antenna and patch antenna?
A patch antenna is used by most GPSs. They don’t have to be rectangular; they can also be polarized in a circular fashion. A slot antenna is a hole in a flat piece of metal or other conductor that serves as an antenna. It’s similar to a dipole in that it has a complementary version.
How does a reflector antenna work?
The function of a standalone reflector is to redirect electro-magnetic (EM) energy, generally in the radio wavelength range of the electromagnetic spectrum. corner reflector, which reflects the incoming signal back to the direction from which it came, commonly used in radar.
Are patch antennas directional?
Patch Antennas, Panel Directional Antennas. A patch antenna (also microstrip) is a directional low profile, low-cost antenna that can be fabricated onto a flat surface, including a Printed Circuit Board (PCB).
What does PIFA stand for?
PIFA
| Acronym | Definition |
|---|---|
| PIFA | Philadelphia International Festival of the Arts (Pennsylvania) |
| PIFA | Planar Inverted-F (type) Antenna |
| PIFA | Packaging and Industrial Films Association (UK) |
| PIFA | Philippine Investment Fund Association |
What is good VSWR?
A VSWR of less than 1.5:1 is ideal, a VSWR of 2:1 is considered to be marginally acceptable in low power applications where power loss is more critical, although a VSWR as high as 6:1 may still be usable with the right equipment.
Is a slot antenna omnidirectional?
The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation patterns that are roughly omnidirectional (similar to a linear wire antenna, as we’ll see). The polarization of the slot antenna is linear.
Is an antenna a waveguide?
A beam waveguide antenna is a particular type of antenna dish, at which waveguides are used to transmit the radio beam between the large steerable dish and the equipment for reception or transmission, like e.g. RF power amplifiers.
What are the advantages of reflector antenna?
Some of the major advantages of the parabolic reflector antenna include the following: High gain: Parabolic reflector antennas are able to provide very high levels of gain. The larger the ‘dish’ in terms of wavelengths, the higher the gain.
