Abstract: An electromagnetic field sensing apparatus which detects an incoming electromagnetic field and provides an RF electrical signal indicative of the strength of the field. The electromagnetic field sensing apparatus includes a metallic antenna which intercepts the incoming planar electromagnetic wave and provides an electrical signal indicative of the strength/intensity of the field. A microwave amplifier receives the electrical signal, amplifies the signal by a factor of at least 100 and then supplies the amplified signal to an electro-optic modulator. A first light source located along a first optical path transmits polarized laser light through the electro-optic modulator. The electro-optic modulator, in response to the amplified electrical signal modulates the polarized light when the metallic antenna detects the incident electromagnetic wave. A photodetector located along the first optical path detects the modulated light as it exists from the electro-optic modulator.

Abstract: The microstrip antenna system uses a special wedge shaped feed connected m the antenna radiation element to the center pin of the coaxial to microstrip adapter to obtain wide bandwidth operation. The special wedge feed connects the center pin to an indefinite series of feedpoints along the length of radiating element. The angle of the taper of the wedge feed along with the distance between the bottom of the wedge and the ground plane provides impedance matching for the antenna.