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A multiuser beam-free circular adaptive active array is considered. Such antennas can be used instead of standard multisector antennas. The multiuser beam-free method implies that coverage area is not divided into cells with different frequencies. Instead, all the users can use all the frequencies and active array selects signals by their position. The comparison of the standard multisector antennas...
This paper deals with the parametric analysis and proper design of parabolic reflector antennas to obtain pencil-beam, cosecant-squared and inverse cosecant-squared radiation patterns for air and coastal surveillance radars. A novel design is introduced to obtain both pencil-beam and cosecant-squared radiation patterns by using the same modified parabolic reflector antenna structure fed by an H-plane...
This paper presents the radiation characteristics of a two-dimensional (2D) horn antenna structure for different multi-source feeding and back wall smoothing variations which are investigated parametrically. In order to get accurate and stable far-field results of the horn antenna in a fast way compare to the other 3D full-wave electromagnetic simulation programs available in the market, an attention...
The original ultra-wideband impedance transformer providing the required electromagnetic matching of the coaxial cable with the dual-arm spiral antenna is proposed. The calculated input reflection coefficient of the spiral antenna with transformer is less than −10dB within the frequency band from 10GHz to 110GHz.
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