Image antenna

Abstract: PROBLEM TO BE SOLVED: To widen a tuning range, to reduce the variation of antenna characteristic due to the influence of a human body, and to secure the stable quality of communication by preparing an inductance element to construct a 2nd loop antenna connected in parallel to a conductor that constructs a 1st loop antenna. SOLUTION: A neck string includes a loop antenna 2 consisting of a metallic wire of copper, etc., having large conductivity or a thin flexible substrate. An air core coil 6 serving as an inductance element is connected in parallel to the antenna 2 in terms of a circuit. The coil 6 is attached in such a direction where the loop opening face is set vertical to the surface of a human body when the coil 6 is put on the human body, so that the effect of an image antenna formed by the human body can be utilized. The total antenna inductance value is reduced because the main antenna 2 fixed to the neck string is connected in parallel to the inductance element 6 in terms of a circuit.

Abstract: The present invention provides a programmable image antenna formed on the face plate of a cathode ray tube (CRT) or on another substrate. The inner CRT face is coated with a silicon semiconductor material replacing conventional phosphors utilized in CRTs for generating visual images. An electron beam impinging upon the silicon-coated CRT face plate creates conductive areas during liberation of minority carriers, in the form of electron-hole pairs. Antenna elements having a virtually unlimited variety of shapes and/or sizes can be formed on the CRT face.

Abstract: Ultra Wide-Band (UWB) pulse radar provides promise for surveillance systems via its high-range resolution. To realize a low-cost and high-quality indoor security system, we propose a UWB radar imaging system using indoor multipath echoes for targets in shadow regions. A multipath wave can be used as an approximation of an imaginary echo from a mirror image antenna to the target, ignoring phase rotation and attenuation. Conventional studies have only dealt with locating point-like targets, not estimating their shape. We apply interferometry using these mirror image antennas to estimate target shapes. If this method alone is applied, many false image points are estimated because it is difficult to determine uniquely the corresponding mirror image antenna to each echo. We propose an effective false-image reduction algorithm to obtain a clear image. Numerical simulations show that most of the false image points are removed and the target shape is accurately estimated.

Abstract: The utility model relates to a vehicle-mounted system, in particular to a mechanical and electrical integration unmanned helicopter vehicle-mounted system. The mechanical and electrical integration unmanned helicopter vehicle-mounted system comprises a transport vehicle, an electric capstan, a sliding rail, a lifting antenna pedestal, a data antenna, an image antenna, an antenna putting-down device and a generator. The electric capstan is installed on a bumper of a vehicle head of the transport vehicle, the generator is placed in the transport vehicle when being transported and placed outside the transport vehicle when being used, a power socket which leads in electricity of the generator is arranged in a vehicle tail of the transport vehicle, the antenna putting-down device is arranged on the top of the transport vehicle, the image antenna is connected with the antenna putting-down device, the inner portion of the transport vehicle is divided into a cab and a warehouse, the sliding rail which can be drawn is installed on the floor of the warehouse, an unmanned helicopter is installed on the sliding rail, cabinets which are used for storing objects are arranged on one side of the sliding rail, the lifting antenna pedestal is arranged on the other side of the sliding rail, and the data antenna is installed on the lifting antenna pedestal and controlled by the lifting antenna pedestal to rise and fall. The mechanical and electrical integration unmanned helicopter vehicle-mounted system has the advantages of being complete in device, reasonable in layout, and capable of meeting requirements of transportation, usage and supply of the unmanned helicopter and relevant supporting facilities.