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Broad Band Electric Field Radiator

IP.com Disclosure Number: IPCOM000073540D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Breton, LA: AUTHOR [+4]

Abstract

Broad-band noise sources are useful in electromagnetic field propagation studies. Preferably, the generator should be of simple construction and yet radiate a wide range of E and H field noise emanations. Such a noise source can utilize energy impulses obtained by a relaxation oscillator effect, with two cascaded spark gaps 10, 12 serving as the nonlinear elements. The gaps are connected in series across capacitor 14 and DC power supply 16 by single conductor strip transmission line 18 in the configuration shown. The main radiation is from the spark gaps 10, 12 and line 18 but an antenna 20 can be added, if desired, to improve field pattern omnidirectionality.

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Broad Band Electric Field Radiator

Broad-band noise sources are useful in electromagnetic field propagation studies. Preferably, the generator should be of simple construction and yet radiate a wide range of E and H field noise emanations. Such a noise source can utilize energy impulses obtained by a relaxation oscillator effect, with two cascaded spark gaps 10, 12 serving as the nonlinear elements. The gaps are connected in series across capacitor 14 and DC power supply 16 by single conductor strip transmission line 18 in the configuration shown. The main radiation is from the spark gaps 10, 12 and line 18 but an antenna 20 can be added, if desired, to improve field pattern omnidirectionality.

Supply 16 has a high output impedance, so that the gaps, line, and capacitor operate in a relaxation oscillator manner. The dimensions and geometric configuration shown have been determined empirically to yield broad-band radiation in the 2.5 to 1,000 megahertz range with high stability. In the example given, the line may be one inch copper strip, capacitor 14 may have a value of 1200 micro-micro farads, and the output impedance of 16 may be 10 megohms.

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