Antennas

Com-Power EMI / EMC broadband and tuned antennas cover the frequency range of 9 kHz - 40 GHz. Most electronic products are required meet the various international EMC regulatory standards before they are introduced to the market. Com-Power broadband antennas were designed to test these products for compliance. These antennas can be used for both EMI radiated emission and immunity testing. Some of the EMC standards require testing include FCC Part 15, MIL-STD 461, FAA- DO-160, CISPR22, IEC-1000-4-3, and EN 55022.

Most of these standards allows the use of broadband antennas such as biconical, log periodic, Loop, combilogs and horns. However, they must be calibrated to yield an antenna factors using procedured given in ANSI C63.4 and CISPR 16 in calibrated open area test site (OATS). These factors are applied as a correction to the measurement during EMC product compliance testing.

Dipole antennas are considered the standard antenna to use for site attenuation measurement and as a reference for calibrating biconical and log periodic antennas operating up to 1 GHz. The 41 inch Active Monopole antenna sometime's referred as rod antenna is used for Mi-lstd 461 and Belcore GR1089 electric field testing below 30 MHz.

Broadband antennas are preferred for automated tests, because it minimizes antenna switching or tuning. They also can handle high input signal to generate electromagnetic fields for radiated immunity testing. They are usually compact enough to fit inside most anechoic chambers. Com-Power biconical, log periodic and horn antennas can be used for both emissions and immunity testing.

In addition to our line of passive antennas, Com-Power also has active horn antennas. These antennas were designed to improve measurement capability of EMC labs for frequencies above 1 GHz. Most broadband passive horn antenna operating above 1 GHz, have antenna factors that reduces ability to measure low amplitude signal. The signal levels picked up the antenna may not be detected by EMI receiver unless it is sufficiently amplified. These antennas have built in preamplifiers. The signal are amplified immediately at the antenna output terminal to increase signal output.

All Com-Power antennas are suitable for in house troubleshooting or pre compliance emissions testing. Radiated Immunity testing can also be done in house but will require substantial investment in facility such a shielded room, anechoic chamber, power amplifier, field probes, software and other instrumentation. Pre compliance testing will reduce time spent at a commercial EMI test lab troubleshooting EMI problems. Using a suitable antenna the engineer can debug the problem, experiment with design changes and implement a solution before taking it back to EMC lab for the final compliance testing.

Below is the list of antennas available from Com-Power. Most of the antennas listed below are available from stock. Com-Power antennas are individually calibrated. and the data will be shipped with the antenna. Please contact Com-Power or local representative for price availability or use request quote link above.