United States of America As Represented by the Secretary of the Air Force

Vari-l Company, Inc.

Thomas A Milligan

Peter Will

A hardwire missile receiver coupled line apparatus is inserted between the antenna output port and the receiver input in a missile communication link to allow signals to be coupled directly into the missile receiver before the missile launch. At launch, the cable to the side of the missile is pulled from the side of the missile. After the cable is pulled, the open circuited cable between the side of the missile and the coupling network does not degrade the signal transmission from the antenna to the receiver.

Hardwire missile receiver coupler

A multifrequency antenna for a missile is realized by an arrangement in which four microwave antennas are located under a narrow circumferential slot in the skin of the missile forming four separate antennas each with its own input connector. Each antenna consists of a probe fed annular quarter wavelength microwave cavity which radiate out of a top wall end slot. The cavity antennas are fed by a stripline distribution network directly under the antennas. Two L band antennas are positioned directly adjacent the inner surface of the missile skin and an S band antenna and a C band antenna are positioned beneath the L band antennas. A radome covers the circumferential slot.

Missile multi-frequency antenna

A broadband mixer has two separate tapered ground plane microstrip baluns associated with a first signal port and two separate tapered ground plane microstrip baluns associated with a second signal port together with a frequency converter or mixer portion coupled between the baluns associated with the first and second signal ports and a third signal port. The frequency converter or mixer portion is comprised of eight diodes in a double balanced bridge arrangement having two sets of terminals associated with the first and second signal ports, each of the terminals of said two sets being separated from each of the terminals of the third signal port by a diode to electrically isolate their respective signals. The baluns associated with the first and second signal ports provide for the transformation of unbalanced input signals to balanced signals at the frequency converting diodes. Another balun coupled between the diode bridge arrangement and the third signal port provides an unbalanced signal at the third signal port in response to balanced signals at the diodes from signal inputs at the first and second signal ports. The baluns associated with the first and second signal ports are cross-connected so that their respective signals do not pass through to the opposite signal port. The circuit is reversible in that a signal may be input to or output from any signal port.

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Littleton, CO, United States of America

Thomas A Milligan