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The Crossed-Dipole Structure of Aircraft in an Electromagnetic Pulse Environment

Abstract : The crossed-dipole receiving antenna has been used as a representative model to approximate electromagnetic pulse effects on aircraft. This paper presents significant experimental and theoretical advances which correctly describe the electromagnetic properties of the crossed-dipole receiving antenna illuminated by a monochromatic source. Results are presented for electrically moderately thin structures. In practice, when a crossed-dipole receiving antenna is excited by a broad spectrum electromagnetic pulse, certain important electrical resonances occur: that is, at specific single frequencies of excitation some portions of the structure can support large amplitude standing waves of current and/or charge. Under such conditions a current maximum/charge minimum, current minimum/charge minimum, or current minimum/charge maximum may occur at the junction region. Examples of resonant and antiresonant situations for the parasitic monopole and the crossed dipole which highlight the possible interactions between the arms of the crossed dipole are presented which give insight into methods of analyzing aircraft in an electromagnetic pulse environment.