Patent ID: 6380906
Filing Date: 2002-04-30
Classification: H01Q

Abstract:
Conical monopole ruggedized transitional airborne to subterranean environment ultra high frequency antenna apparatus comprising the combination of:an electrically conductive ground plane member disposed on a rearward portion of an air deliverable earth penetration military weapon device; an upstanding electrically conductive radiating element of ultra high frequency tunable length located in a central portion of said ground plane member and extending rearward of said military weapon device; said electrically conductive radiating element having both an inverted upstanding conical shape with a conical apex electrical node disposed adjacent said electrically conductive ground plane member while in electrical isolation therefrom and a conical base portion disposed generally parallel with and separated from said electrically conductive ground plane member; said electrically conductive radiating element being comprised of porous electrically conductive material disposed in a closed conical surface geometric configuration; a mass of cured elastic urethane resin dielectric material surrounding, embedding and impregnating said porous radiating element, ground plane, and extending from a radiating element-adjacent face of said electrically conductive ground plane member rearward of said military weapon device; said cured mass of urethane resin material having a dielectric constant greater than that of air and tending to increase an effective electrical length characteristic of said electrically conductive radiating element in excess of a physically-determined nominal ultra high frequency electrical length characteristic thereof; said cured mass of resin material also having external physical shape and dimensions compatible with a surrounding rearward receptacle portion of said military weapon device and compatible with earth and target penetration deceleration forces predicted for said military weapon device.