Abstract: A security system for monitoring an area under surveillance includes a transmitter for generating radio frequencies (RF) signals when actuated using an actuator. A sensing station receives the RF signals from the transmitter. A monitoring station generates video signals of the area under surveillance and provides one end of a duplex audio communications system. A control station, coupled to the sensing station and the monitoring station, actuates the monitoring station in response to the RF signals sensed by the sensing station. The control station includes an opposite end of the duplex audio communications system and a display for displaying the video signals.

Abstract: A surge suppression device which fits over the end of an electrical plug and permits normal mating of the plug with the female receptacle. In the preferred embodiment, the device includes a body of metal-oxide varistor (MOV) material where one pin is connected to one plate on the MOV and another plug pin is connected to an opposing plate on the MOV. The MOV breaks down when experiencing excessive voltage levels to shunt potentially damaging voltages between the plug pins thereby preventing the spikes from reaching the protected equipment.

Abstract: A low-profile multioctave frequency band microwave mode forming network is provided which includes a plurality of circuit layers having circuitry for receiving M feed signals which may provide M beams or modes of operation. Each circuit layer has a dielectric board with circuitry formed on top and bottom surfaces thereof and is sandwiched between top and bottom dielectric layers to form a tri-plate stripline circuitry. The circuit layers are dielectrically isolated from one another and further separated by conductive ground planes. The circuitry includes a plurality of couplers, phase shifters and transmissions lines which do not require transmission line cross-overs on any given surface. A plurality of right-angle RF interconnects are included for providing electrical connection to the circuitry. Output ports are provided for coupling said feed network to N elements of an antenna system.

Abstract: End-capping an aromatic diamine or a precursor formed by reaction of an aromatic diamine with an aromatic dianhydride with difluoromaleic anhydride yields prepolymers which thermally cure at temperatures from about 150.degree. to about 200.degree. C. to form polymers which display long-term thermal stability at temperatures up to 300.degree. C. and more.

Abstract: A gas laser having a bandwidth which substantially exceeds the normal doppler bandwidth. To this end the lasing beam is made to propagate at an angle to the direction of flow of the stream of lasing gases. The gases should move at a supersonic speed so that the normal doppler bandwidth of the laser is shifted up or down in frequency by a predetermined amount. By utilizing two or more gas flows at different angles to each other, the normal amplification band of the laser medium can be shifted up and down in frequency by different amounts to obtain an overall bandwidth on the order of 1 - 2 gigahertz (ghz).

Abstract: Various antenna systems are disclosed which generate a shaped beam having a substantially Gaussian distribution substantially without sidelobes. The antenna system consists of basic subarrays consisting of seven or nine radiating elements arranged respectively in a circle with a central element or in the form of a square. The radiating elements are fed in phase but the power applied to each element and the spacing is so selected that due to interference the sidelobes substantially disappear. More complex antenna arrays to form different beam shapes may be formed from the two basic subarrays.