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A single-negative (SNG) metamaterial insulator is designed to reduce coupling between two closely-spaced antennas. The proposed single-negative (SNG) metamaterial-inspired resonator is formed by connective and symmetrical placed spirals to have small size (0.03λ0×0.14λ0). The designed SNG structure functions as insulator in certain frequencies to efficiently reduce mutual coupling between two closely-spaced...
In order to meet the demands for direction of arrival (DOA) estimation in high-altitude platforms (HAPs) communication systems, a DOA estimator using field programmable gate array and digital signal processor (FPGA + DSP) hardware architecture for a 16-element spherical array on aerial platform is presented in this paper. The 16 channel received intermediate frequency (IF) signals are acquired by...
An array with modified ultra-wideband (UWB) Quasi-Yagi antennas is designed. The Quasi-Yagi antenna is adopted in this design which has obtain the characteristics of UWB (3.1-4.1 GHz) and high-gain (10 dB) in practical project effectively, through modifying the radiation part, designing a broadband feeding network, and grouping an array. The final size of this antenna is 218×110 mm2, and the thickness...
Aperture coupling feed and double-layer microstrip patch structure are applied to design microstrip antenna element and subarrays of microstrip antenna array with high gain low sidelobe and backlobe at Ku-band. Parallel feed and T-junction type power divider are used to design low sidelobe array by the principle of Dolph-Chebeshev distribution. The simulate results show that the relative bandwidth...
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