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Broadband Circularly Polarized Antenna for Susceptibility Testing

IP.com Disclosure Number: IPCOM000042792D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

German, RF: AUTHOR [+2]

Abstract

Circularly polarized fields are produced from crossed biconical antennas which are driven by phased signals. These circularly polarized fields are particularly useful for performing susceptibility tests upon equipment which may encounter horizontally and/or vertically polarized electromagnetic fields such as those produced by radio, television and the like. The antenna array is shown in front view in Fig. 1 and is composed of two biconical antennas. One antenna is formed of elements 10 and 11 oriented vertically, while the second is formed of elements 12 and 13 oriented in a horizontal position. Each antenna is a conventional biconical antenna, such as the AILTECH Model 94455-1, which separately generates linearly polarized signals for transmitting and receiving signals in the 30-200 MHz frequency range. As shown in Fig.

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Broadband Circularly Polarized Antenna for Susceptibility Testing

Circularly polarized fields are produced from crossed biconical antennas which are driven by phased signals. These circularly polarized fields are particularly useful for performing susceptibility tests upon equipment which may encounter horizontally and/or vertically polarized electromagnetic fields such as those produced by radio, television and the like. The antenna array is shown in front view in Fig. 1 and is composed of two biconical antennas. One antenna is formed of elements 10 and 11 oriented vertically, while the second is formed of elements 12 and 13 oriented in a horizontal position. Each antenna is a conventional biconical antenna, such as the AILTECH Model 94455-1, which separately generates linearly polarized signals for transmitting and receiving signals in the 30-200 MHz frequency range. As shown in Fig. 2, elements 10 and 11 of the vertical antenna are driven from junction 15 coupled by a transmission line 16 to a balun and phase splitter located in box 18. Similarly, elements 12 and 13 of the horizontal antenna are driven from junction 20 through transmission line 21 also coupled via a balun to the splitter in 18. While elements 10 and 11 are not shown in Fig. 2 in the interest of clarity, they are configured the same as elements 12 and 13. A signal generator (not shown) provides a RF signal varying through the 30-230 MHz range at input 22 for the splitter located in
18. The spli...