International audienceA 2.45-GHz rectifying antenna (rectenna) using a compact dual circularly polarized (DCP) patch antenna with an RF-dc power conversion part is presented. The DCP antenna is coupled to a microstrip line by an aperture in the ground plane and includes a bandpass filter for harmonic rejections. It exhibits a measured bandwidth of 2100 MHz (10 dB return loss) and a 705-MHz CP bandwidth (3 dB axial ratio). The maximum efficiency and dc voltage are respectively equal to 63% and 2.82 V over a resistive load of 1600 Omega for a power density of 0.525 mW/cm(2
An efficient proximity coupled microstrip patch antenna has been designed at 2.45 GHz. The length of the feeding line penetration and a simple rectangular slot etched in radiation element are used to reject the 2 nd and the 3 rd harmonic frequencies. The proposed antenna is well suitable for microwave wireless transmission because no input low pass filter and no viahole connections are required, resulting in simpler and compact structures. An electromagnetic simulation has been used to optimise the antenna. The antenna gain is 6.37 dB at 2.45 GHz operating frequency. The return losses at the 2 nd and 3 rd harmonic frequencies are -0.4 dB and -0.8 dB, respectively.
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