Additional Features:

• Frequency Range: 25 MHz to 300 MHz
• Polarization: Linear
• Nominal Impedance: 50?
• 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): 51.5” x 20.2” x 27.2” [130.8 x 51.3 x 69.1 cm]
• Weight: 5 lbs. [2.3 kg]
• Transmit & Receive Capabilities emissions/immunity applications
• Individual Calibration Included per ANSI C63.5 or SAE ARP958 with NIST traceability
• Three-year Standard Warranty

The Com-Power AB-900A is a broadband, linearly polarized Biconical Dipole Antenna, operating over the frequency range of 25 MHz to 300 MHz. It can be used as either a receiving antenna (for EMI measurements) or as a transmitting antenna (for immunity tests) for power levels up to 50 watts.

Construction

The antenna elements are constructed using a corrosion resistant aluminum, which is powder coated for additional durability. Implemented in the element design is a “gamma match” rod, which connects the element’s center rod to one of the outer elements at the inside edge of the 90 degree bend. The gamma match is necessary in order to avoid a significant “dip” in the antenna’s performance which would otherwise be present between approximately 275 and 290 MHz.

Calibration

Each antenna is individually calibrated per ANSI C63.5 or SAE ARP958 with NIST traceability. The calibration data and certificate is provided. Recognized ISO 17025 accredited calibration is also available upon request.

Application

The AB-900A Biconical Antenna is intended for use as an EMI test antenna for qualification-level regulatory compliance measurements (FCC, CE, MIL-STD-461, RTCA DO-160, FDA, SAE Automotive, etc.). The AB-900A can also be used in conjunction with an RF power amplifier (up to 50 watts) to generate RF fields associated with radiated immunity testing.

In addition, a pair of AB-900A Biconical Antennas can also be used for Normalized Site Attenuation (NSA) calibrations of Open Area Test Sites (OATS) or SemiAnechoic Chambers (SAC) using the Geometry Specific Correction Factors (GSCF) given in Tables G.1 through G.3 of ANSI C63.5, as its physical dimensions conform to the minimum and maximum values given in Figure G.1 of ANSI C63.5 (Dimensions of biconical dipole antennas evaluated for numerical correction). If biconical antennas have dimensions which do not conform to these dimensions, the given GSCF values cannot be used, and would need to be determined by performing GSCF calibration on a Standard Antenna Calibration Site (SACS) as described in Annex H of ANSI C63.5. 

Notwithstanding the above applications, the AB-900A can also be used for test site comparisons, shielding effectiveness tests of large enclosures, field monitoring, site surveys and other general purposes.

Mounting

The recommended support structures for the AB-900A are Com-Power’s AM-400 Antenna Mast and AT-812 Antenna Tripod. One of the standard AT-812 accessories is the ATHP-812 Antenna Pipe Holder, which clamps securely around the one-inch diameter feed tube of the AB-900A. The ATHP-812 is then secured to a tripod or mast via its 1/4” x 20 thread mounting hole.