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Equivalent charge method is used to design ultra wide band asymptotic conical dipole (ACD) antenna. Combination of linear charge density and point charges is used to generate difierent proflles for ACD antennas. Two difierent proflles of ACD antenna are used as a feed for re∞ector based impulse-radiating antennas (IRAs). This paper focuses on the selection of ideal ACD proflle as well as the requisite charge distribution for ACD antenna as a feed to design 100› input impedance re∞ector IRA. An ideal Conflguration of ACD feeding structure for re∞ector IRA is chosen based on FDTD analysis results. To validate the utility of the proposed new feed an ACD-fed half IRA is realized with input impedance of nearly 50›. Measurements are carried out using single-ended instrumentation without any impedance adaptor as commonly done with Conventional IRAs.

SELECTION OF IDEAL FEED PROFILE FOR ASYMPTOTIC CONICAL DIPOLE FED IMPULSE RADIATING ANTENNA