In this paper an energy harvester at 35GHz has been developed which known as rectenna. An array of rectangular microstrip patch antenna with 16 elements was used to efficiently convert RF to DC signal. A step impedance low pass filter is used between antenna and rectifier circuit to suppress second order harmonic generated by diode. A GaAs Schottky diode MA4E1317 was used in parallel with load as half wave rectifier circuit. The fabrication process is based on conventional optical photolithography to obtain an integrated circuit. The maximum RF to DC conversion efficiency of 67% was successfully achieved with input RF power of 7mW at 35.7GHz.
One of the important parts of the infrared seeker is the counter countermeasure part. Seeking in a field of view with the existence of jammers is not simple and needs effective algorithms. In this paper, several methods of the detection in a crossed array trachers (CAT) seeker will be designed, simulated and evaluated. These methods depend on detecting the appearance of the flare using analzing the two channels signals.
Spin reticle infrared seekers have good linearity, and the pulse-modulated reticle seekers have good digital characteristics for anti-jamming processing. A basic design for a spin pulse-modulated reticle is introduced. This design uses the rotating design of the optical system in the spin infrared seekers and an improved design of the reticle in the pulse-modulated seekers. The reticle contains a unique well-designed slit to produce one pulse for each target in the spinning period. The target data will be carried by the unique pulse parameters. A simulation tool is implemented using the MATLAB packages for analyzing and evaluating the new design.
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