Phase mode analysis of directional elements in a circular array
A technique for analyzing the directional elements of a circular array is presented. The technique is based on phase mode decomposition of measured element patterns. It can be used to calibrate the array and may help identify sources of measurement errors. It is illustrated with patterns from a 108-element circular array.
Pattern synthesis of uniform circular arrays with directive elements
The article discusses the synthesis of radiation patterns using circular arrays of directive elements. This type of array is suitable for phased array applications and for multiple beam systems, and it could also be an excellent candidate to face up base-station demands for future wireless communication services. A Fourier series synthesis method is utilized to synthesize different radiation patterns using circular arrays of N elements with a cardioid pattern (ideal elements) and of N dipoles uniformly arranged in front of an infinite metallic cylinder.
Effect of antenna phase centre displacement on FM-CW measurements: application to radar system
In FM-CW measurements, the displacement of the phase centre of the antenna generates a parasitic Doppler effect. Comparisons between measurements and simulations of a LPD antenna are described and validated. The Doppler effect induced by this antenna is then computed for the FM-CW radar application and compared to the classical one due to the aircraft movement.