The TBMA3 is an affordable logarithmic periodic measurement antenna, targeting radiated noise EMC pre-compliance testing.

The TBMA3 is characterized from 250 MHz to 1.3 GHz and has VSWR and antenna factor values typical for log-periodic measurement antennas.

CISPR 16 divides the frequency range into several bands and defines specific antennas for each of these bands. For the frequency range above 300 MHz up to 1 GHz, CISPR 16 specifies using logarithmic periodic antennas (log-periodic antennas ) for radiated noise measurements.

The TBMA3 is an average-sized log-periodic antenna, with its radiating elements and supporting booms made from powder-coated aluminum alloy. It is equipped with a standard female N-connector and comes together with an antenna bracket and a mounting adapter. A standard ¼” thread on the bottom of the mounting adapter makes it easy to connect it to most standard tripods.

The TBMDA3 is shipped in a robust carrying case, as pictured above.

• Type: logarithmic periodic
• Frequency range: 250 MHz– 1300 MHz
• Nominal impedance: 50 ?
• Connector: N-type female
• Maximum continuous input RF power: 100 W
• Isotropic gain: 6 dBi ± 1.5 dB
• Antenna factor: 14.2 … 27.5 dB/m
• Voltage Standing Wave Ratio (VSWR): < 1.95:1 over the entire
• frequency range; 1.35:1 average
• Width: 749 mm (29.49”)
• Height (With the mounting adapter): 170.23 mm (6.70”)
• Height (Without the mounting adapter): 79.5 mm (3.13”)
• Depth: 863 mm (33.98”)
• Weight: 1.78 kg (3.92 lbs)
• Tripod Adapter Thread Size: ¼”

EDN Review (EMC Blog from Kenneth Wyatt)