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An effective solution of generating OAM-carrying radio beams with three polarizations is provided. Through the reasonable configuration of phased antenna array using elements with three polarizations, the OAM radio waves with three polarizations for different states can be generated. The vectors of electric fields with different OAM states for linear, as well as left or right circular polarizations...
In this paper, a block of active phased antenna subarray module for the high resolution synthetic aperture radar (SAR) applications was designed, fabricated and measured. The measured results of the module show perfect characteristics and verified by the experiment.
An improved coupled ultra-wideband (UWB) dual-polarized antenna array with the periodically corrugated ground is presented. Toroidal elements are linked by interdigital capacitors, which are introduced to utilize the mutual coupling between elements and enlarge the array bandwidth. Extra dielectric layer is also placed over the capacitive-coupled array to improve the impedance stability. Besides,...
A new analog beamforming method is proposed for the periodical amplitude modulation array. The weights for beamforming are transformed to the amplitudes and initial phases of periodical sinusoidal amplitude modulation signals added to each RF channel. Compared to existing beamforming method with time modulated array, the new method generates less harmonic radiation and occupies less bandwidth. Two...
High-speed railway has been developing rapidly especially in china not only for the great convenience but also for the considerable profit. However, the current railway mobile communication system offers a low compatibility for trains at the speed higher than 350km/h, due to the Doppler and multipath affections. In order to solve this problem, a frequency and pattern reconfigurable antenna array system...
Mid-Field Calibration Technology (MFCT) has the advantages of low cost and easy implementation, while may not work correctly when modules are relatively large, due to its susceptibility to parallelism tolerance on phase calibration. This paper presents an improved method for MFCT which will effectively solve the problem without increasing the complexity of the system. Experimental results show that...
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