Antenna Symbols | Symbols of Antenna

Before talking about various types of antenna symbols I would like to describe about antennas. Antennas for use at microwave frequencies. Antennas serve either or both of the following two functions: the generation and the collection of electromagnetic energy. In the transmission system, a radio-frequency signal is developed, amplified, modulated, and applied to the antenna. The RF current flowing through the antenna produces electromagnetic waves that radiate into the atmosphere. In a receiving system, electromagnetic waves “cutting” through the antenna induce alternating currents for use by the receiver.

To have adequate signal strength at the receiver, either the power transmitted must be extremely high or the efficiency of the transmitting and receiving antennas must be high because of the high losses in wave travel between the transmitter and the receiver. 

Any receiving antenna transfers energy from the atmosphere to its terminals with the same efficiency with which it transfers energy from the transmitter into the atmosphere. This property of interchangeability for transmitting and receiving operations is known as antenna reciprocity. Antenna reciprocity occurs because antenna characteristics are essentially the same regardless of whether an antenna is sending or receiving electromagnetic energy.

Because of reciprocity, we will generally treat antennas from the viewpoint of the transmitting antenna, with the understanding that the same principles apply equally well when the antenna is used for receiving electromagnetic energy.

Antennas produce or collect electromagnetic energy and they should do so in an efficient manner. Consequently, antennas are composed of conductors arranged to permit efficient operation. The efficient operation also requires that the receiving antenna is of the same polarization as the transmitting antenna. Polarization is the direction of the electric field and is, therefore, the same as the antenna’s physical configuration. Thus, a vertical antenna will transmit a vertically polarized wave. The received signal is theoretically zero if a vertical E field cuts through a horizontal receiving antenna. 

The received signal strength of an antenna is usually described in terms of the electric field strength. If a received signal induces a 10 \mu V signal in an antenna 2 m long, the field strength is \dfrac{10 \mu V}{2m} or 5 \mu V. The received field strength is inversely proportional to the distance from the transmitter.

The list of various antenna symbols is shown below:

ANTENNA SYMBOL

NAME OF ANTENNA

 symbol of antenna  Antenna:

Antenna produces or collects electromagnetic energy and they should do so in an efficient manner. Consequently, antennas are composed of conductors arranged so as to permit efficient operation. The efficient operation also requires that the receiving antenna is of the same polarization as the transmitting antenna.

symbol of turnstile antenna Turnstile Antenna:

Turnstile antenna is also called crossed dipole antenna, designed using two identical dipole antenna placed at the right angle to each other. The two current is applied to phase quadrature which is 900 out of phase.

symbol of circularly polarized antenna  Circularly Polarized Antenna:

The circularly polarized antenna is an antenna that is designed for producing or responding to circularly or elliptically polarized waves only. This type of antenna provides a high-gain omnidirectional circularly polarized radiation pattern.

 symbol of adjustable elevation radiation antenna Adjustable Elevation

Radiation Antenna

 symbol of adjustable azimuth radiation antenna Adjustable Azimuth

Radiation Antenna

 symbol of fixed azimuth radiation antenna Fixed Azimuth

Radiation Antenna

 symbol of horizontally polarized antenna Horizontally Polarized

Antenna

 symbol of vertically polarized antenna Vertically Polarized

Antenna

 symbol of UHF or VHF power divider antenna UHF or VHF Power

Divider

symbol of horn antenna or feed

 

Horn Antenna

or Feed

symbol of direction finding antenna

 

Direction Finding

Antenna

symbol of dipole antenna

 

Dipole Antenna
symbol of loop antenna 1

 

Loop Antenna
symbol of folded dipole antenna

 

Folded Dipole
symbol of folded diplole with 2 directors and 1 reflector

 

Folded Dipole with 2

Directors and 1 Reflector

symbol of slot antenna

 

Slot Antenna:

Coupling RF energy into a slot in a large metallic plain can result in radiated energy with a pattern similar to a dipole antenna mounted over a reflective surface. The length of the slot is typically one-half wavelength.

symbol of rhombic antenna

 

Rhombic Antenna:

A rhombic antenna, as its name implies, is composed of four long, straight wires arranged to form a rhombus. it is fed at one corner and terminated in a matched load at the opposite corner. Traveling waves of current. 1800 out of phase, are launched onto legs 1 and 2.

symbol of rhombic antenna with resistor

 

Rhombic Antenna with Resistor:

It is a normal rhombic antenna with a resistor connected between two-leg, opposite to the input fed.

symbol of loop antenna

 

Loop Antenna
symbol of loop antenna (SLD) Loop Antenna (SLD)

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