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This paper presents a study of rectifier prototype and diode modelization. The rectifying circuit with single Schottky diode HSMS-2860 at 2.45 GHz is proposed for energy harvesting applications. In such applications, the input power is very low, mainly about -20 dBm. Based on an analysis of matching circuit, the rectifiers with single stub matching circuit, with radial stubs low pass filter, or with compact structure were designed by using circuit simulation and co-simulation in ADS. The output DC voltages of 36.2 mV and the conversion efficiency of 1.3% were measured over a load resistance of 10 kΩ for -20 dBm microwave incident power.

A dual-polarized and beam switchable patch antenna array, which works well along the entire GHz) is introduced in this article. The proposed array is formed with cross-type antenna unit cell and fed by a balanced power division network with microstrip lines. By tuning the length of paths in the feeding network, phase differences taking place among units, therefore, beam-shifting could be obviously observed on the measured radiation patterns. It is worth while noting that, as patch sharing technique is used in the array arrangement, not only the interelement distance is significantly decreased but also the beam-shifting angle is distinctly enlarged in the case of same phase-shifting. The proposed antenna can be easily fabricated on very low-cost Teflon substrate with printing circuit technology, which might be a good candidate for direct broadcast from satellite reception antenna. In this article, the configuration of an experimental 1 3 4 array and its measured S-parameters and radiation characteristics will be given.

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