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

Steven D Mittleman

Paul H Carr

Lester F Lowe

David Da-Wei Liu

John A Cappelli

First and second tandemly positioned electrically biased semiconductor members radiate microwave energy in response to the receipt of an excitation light beam having two wavelengths related to the bandgaps of the members. The projected microwave beam may be made more narrow and directional if two of the members are electrically biased at the same time. An inefficient frequency doubler generates the two wavelength beam enabling a single light beam to excite both members in a simple, rugged photoconductive antenna element.

Three dimensional reconfigurable photoconductive antenna array element

A dual cavity ionization chamber provides a means to measure dose enhancement factors under a wide range of conditions. The chamber can be calibrated to give an absolute dose reading for silicon, gallium arsenide, or any other material together with the associated enhancement factor.

Growing community of inventors

Framingham, MA, United States of America

Steven D Mittleman