Com-Power ABF-900 Biconical Dipole Antenna with operating frequency of 25 MHz up to 300 MHz

ABF-900 Biconical dipole antenna with collapsible elements is highly portable and can be stored and transported with ease due to its compact design.
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The ABF-900 is a biconical dipole antenna which can detect all frequencies between 25MHz and 300MHz. It can be used as a transmitting antenna, or as a receiving antenna.

The linearly polarised ABF-900 antenna can be used at higher frequencies for testing radiated immunity, or at lower frequencies for EMI testing. You can make the antenna suitable for immunity testing by attaching an RF power amplifier which allows you to generate the required RF fields.

Biconical antenna design

What makes the ABF-900 biconical antenna design unique is its incorporation of the removable gamma match rod. No other biconical dipole antenna has this important feature, which allows for improved performance between the 275 and 290 MHz frequencies.

Technical Drawing ABF-900 Biconical Dipole Antenna

The antenna weighs 2.5kg and is 130.8cm high, 53.3cm wide, and has a diameter of 70.1cm. Each of its elements can be folded to a diameter of 5cm, so you can easily transport and store it.

The ABF-900 is constructed of corrosion-resistant aluminium for extra durability. We're so confident in the strength of the antenna that we provide a 3 year guarantee.


The ABF-900 is designed for use as an EMI test antenna for regulatory compliance measurements according to common EMC standards. (Mil-Std, RTCA DO-160, FCC, CE, SAE Automotive, FDA, etc.).

Because the ABF-900 is broadband, this makes it an excellent choice when conducting sweep measurements and using automated measurement systems.

Radio Frequency (RF) fields associated with radiated immunity measurements can be generated by combining the ABF-900 antenna with an RF power amplifier (up to 50 watts).

With two ABF-900 antennas you can make Normalised Site Attenuation Calibrations of Semi Anechoic Chambers or Open Area Test Sites. This biconical dipole antenna can also be used for field-monitoring, site surveys, and testing the shielding-effectiveness of large enclosures.

Each of its antennas are individually calibrated to ANSI C63.5: 2006 regulation, of which we also include the appropriate certificate and data with the product.

The antenna's maximum input power is 50 watts, and it has a nominal impedance of 50Ω. It uses a female N-type connector.

If you need to mount the ABF-900, we recommend using a AT-812 Tripod – we also supply them on our website. This antenna can be purchased separately or as part of the ANK-310, ANK-910L and ANK-910M antenna kits.

Antenna Factors

The Antenna Factor is used by RF and EMC antenna engineers to describe the electric field strength needed to produce 1 Volt at the antenna terminals. Using the sum of Measured Voltage + Antenna Factor 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 ABF-900 has a varying Antenna Factor of between 6 and 21 [dB(m-1)], and an average Antenna Factor of 12.6 [dB(m-1)].

Antenna Factors for ABF-900 Biconical Dipole Antenna

Isotropic 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 in specification sheets more frequently than directivity because the Isotropic Gain considers the actual losses, whereas directivity does not. As shown in the below graph, the ABF-900 biconical dipole antenna has a varying Isotropic Gain of between -15 and 3 dBi, and an average Isotropic Gain of -2.9 dBi.

Isotropic Gain for ABF-900 Biconical Dipole Antenna

Voltage Standing Wave Ratio

The Reflection Coefficient helps to describe reflected power from an antenna. The Voltage Standing Wave Ratio (VSWR or Standing Wave Ratio) 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 above graph, this antenna has a Voltage Standing Wave Ratio between 1.2 and 34 :1, and an average VSWR of 8.1 :1.

VSWR Graph for ABF-900 Biconical Dipole Antenna

ABF-900 Biconical Dipole Antenna Datasheet

Datasheet PDF
Technical Specification
Product Name: Biconical Dipole Antenna
Manufacturer: Com-Power
Model: ABF-900
Frequency Range: 25 MHz - 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 53.3 x 70.1 cm / 51.5” x 21” x 27.6”
Weight: 2.5 kg
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