EMC antennas measure radiated emissions and radiated immunity in rugged environments that involve frequent handling and rapid replacement. Variants with broad bandwidths have a broad frequency spectrum covered in the performance of immunity measurements and EMC radiated emissions. They perform two types of measurements, radiated immunity and radiated emissions.
What Is Antenna Factor?
Antenna Factor (AF) is the ratio of the electric field (E) to the voltage (V) induced across the terminals of an antenna. Additionally, AF is when radiated emissions testing is used to convert a voltage level fed by a transducer. Made to quantify bandwidth, the AF EMC antenna parameter also quantifies the value of incident electric fields while the companion parameter, TAF, determines the value of the electric field at a known distance from the generating antenna. The transducer is converted to the input terminals of an EMI analyzer into field-strength units of the electromagnetic field producing the voltage.
The AF is the antenna specification that is most often used. With regards to the antenna factor, there is a relationship between electric field power and the power density of the incident as well as the electric field strength. Transmit Antenna Factor, or TAF, refers to the means of input voltage to the antenna that provides a certain value of the electric or electromagnetic field at a specific distance from the antenna. The transmit antenna factor relates the value of the electromagnetic field or the electricity generated by the antenna as a basis of its input.
Types of EMC Antennas
- Biconical Antenna
- A biconical antenna is a type of dipole antenna that is commonly used for the measurement of radiated emissions from 30 MHz to 200 or 300 MHz. A bowtie antenna is a common subtype of the biconical antenna as it is a two-dimensional version of the biconical design and is used for short-range UHF television reception. A conical monopole antenna is a wire approximation of the biconical antenna and has an increased bandwidth. Biconical antennas are frequently used in EMI testing and emissions testing.
- Log-Periodic Antenna
- A log-periodic antenna is a common broadband antenna typically used for the measurement of the radiated emissions from 200 MHz to 1 GHz. Log-periodic antennas are multi-element, directional antennas that are designed to operate over a wide band of frequencies. Log-periodic antennas have a radiation pattern that is unidirectional with the main lobe along the axis of the boom.
- Half-Wave Dipole Antenna
- Half-wave dipole antennas have a thin wire fed at the midpoint by a voltage source. The complete length of a dipole equals half-wavelength and each leg of a dipole has a length that is equal to the quarter of a wavelength. a half-wave dipole antenna is a simple and widely used class of antenna.
- Loop Antenna
- A loop antenna is a radio antenna that has a loop electrical conductor typically fed by a balanced source. Loop antennas have either large loops and small loops, and many of these antennas are in the shape of a circle with a radiation pattern that peaks at right angles to the plane of the loop.
- Double Ridge Horn Antenna
- A horn antenna with ridges attached to the inside of the horn, which extends down the center of the sides. The ridges are on the antenna to lower the cutoff frequency and increase the antenna's bandwidth.
- Monopole Antenna
- A monopole antenna has a straight rod-shaped conductor that is typically mounted perpendicularly over a conductive surface. A monopole antenna is a radio antenna and is often used as a resonant antenna.
Advanced Test Equipment Corporation offers a large inventory of EMC antenna rentals from top industry leaders. Browse our inventory of biconical antennas, dipole antennas, loop antennas, horn antennas, log periodic antennas, monopole antennas, and GPS antennas. We carry
EMCO,
AH Systems,
Com-Power,
Agilent,
Compliance Design, and many more.
