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A low-profile broadband circularly polarised patch antenna with four parasitic patches (PPAs) is presented. The proposed antenna has the advantages of broadband reflection coefficient, broadband axial-ratio (AR) performance and low-profile structure. First, a broadband feed network is employed to realise wide reflection coefficient and AR bandwidths. To enhance the gain performance, two types of PPAs...
In this paper, a 1×8 active antenna array based on frequency shiftable vector modulator (FSVM) module is demonstrated. The FSVM module can flexibly shift the operating frequency band of the vector modulator (VM) while not deteriorating the signal performance. By employing the FSVM module, a 1×8 active antenna array with a RF path beamforming structure is developed. Since the magnitude and phase of...
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