Com-Power Biconical Antenna for EMC/EMI testing between 25 MHz ~ 300 MHz

AB-900 Biconical antenna is used for emissions and immunity testing to meet various EMC standards. It can be used as a receiving antenna or transmitting antenna.
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The AB-900 Biconical Antenna can detect all frequencies between 25 MHz and 300 MHz.

You can use it as a receiving antenna, or as a transmitting antenna. For example, the AB-900 (which is broadband and linearly polarised) can be used at lower frequencies for EMC/EMI testing.

At higher frequencies it can be used for testing radiated immunity. You can do this by attaching an RF Power Amplifier which allows you to generate the suitable RF fields for immunity testing.

The AB-900 is made of powder coated, corrosion-resistant aluminium for lasting durability. We're so confident in the resilience of this antenna that we offer a 3 year guarantee.

Drawing of AB-900 Biconical Antenna

It weighs 2.3kg and is 130.8cm high. The antenna has a width of 51.3cm and a depth of 69.1cm.

Biconical antenna applications

The AB-900 biconical antenna is often used for regulatory compliance measurements such as CE, SAE Automotive, MIL-STD-461, RTCA DO-160, FCC, FDA and many more. It is perfect for measuring electromagnetic interference (EMI), allowing you to accurately conduct a variety of qualification-level tests.

Another feature is its gamma match rod which allows for better performance between the 275 and 290 MHz frequencies. The antenna also has a N-type connector, a maximum input power of 50 watts, and a nominal impedance of 50Ω.

Each of its antennas are individually calibrated per SAE ARP958 or ANSI C63.5 and are traceable with NIST. We include the appropriate certificate and calibration data with the product.

By using a pair of AB-900 antennas you can make NSA (Normalised Site Attenuation) calibrations of Open Area Test Sites (OATS) or Semi Anechoic Chambers. This antenna can also be utilised for site comparisons, site surveys, field-monitoring and testing the shielding effectiveness of large enclosures.

The long dipole lengths at lower frequencies makes this biconical antenna more suited to vertical site attenuation measurements (commonly, tuned dipole antennas are used for accurate site attenuation measurements instead).

If you need to mount the AB-900, we suggest using the AT-812 Tripod which we also supply on our website.

Antenna factors for AB-900

EMC and RF antenna engineers use the Antenna Factor to describe the electric field strength needed to produce 1 Volt at the antenna terminals. Using the sum of Antenna Factor + Measured Voltage you can calculate the Field Strength of the antenna. Also, the Antenna Factor shows what the antenna's received voltage is when an electric field is present. As shown in the graph below, the AB-900 has a varying Antenna Factor of between 6 and 21 [dB(m-1)]. Its average Antenna Factor is 12.6 [dB(m-1)].

Antenna Factors for AB-900 Biconical Antenna

Biconical Antenna Gain

Isotropic gain is used to describe the amount of power transmitted in the path of peak radiation to an isotropic source. The antenna gain term is mentioned more often than directivity in specification sheets. This is because the Isotropic Gain considers the actual losses, whereas directivity does not. As shown in the below graph, the AB-900 has a varying Isotropic Gain of between -15 and 3 dBi. Its average Isotropic Gain is -2.9 dBi.

Isotropic Gain for Biconical Antenna AB-900

VSWR Graph for AB-900

The reflection coefficient is used to describe reflected power from an antenna. The Voltage Standing Wave Ratio (VSWR or SWR) is a function of this. Most commonly, the VSWR of a transmitting antenna is examined and measured upon tuning and installation. This prior measurement is required, to assure that damage isn't made to the antenna's transmitter if it receives an unexpected electrical impedance. This damage occurs because an antenna/feed line impedance which is non-matching prevents the antenna's full power being reached. As shown in the graph below, the AB-900 biconical antenna has a Voltage Standing Wave Ratio of between 1.2 and 34 :1. Its average VSWR is 8.1 :1.

VSWR Graph Biconical Antenna AB-900

AB-900 Product Datasheet

Datasheet PDF
Technical Specification
Product Name: Biconical Antenna
Manufacturer: Com-Power
Model: AB-900
Frequency Range: 25 MHz to 300 MHz
Polarization: Linear
Nominal Impedance: 50 Ω
Power Handling: 50 Watts (continuous)
Connector: N-Type (female)
Antenna Factor: 6 to 21 (average: 12.6) [dB(m-1)]
Isotropic Gain: -15 to 3 (average: -2.9) dBi
VSWR: 1.2 to 34 (average: 8.1) :1
Test Specifications: FCC, CISPR, EN, ETSI, FAA, MIL-STD 461, Automotive, etc.
Dimensions (H x W x D): 130.8 x 51.3 x 69.1 cm / 51.5” x 20.2” x 27.2”
Weight: 2.3 kg / 5 lbs.
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