Linear Arrays

A novel dual-band waveguide slot array antenna with low cross-polarisation is proposed. The main structure of the proposed antenna consists of two waveguides in which the top broad wall of the smaller waveguide, a WR-28 Ka-band waveguide, is connected to the top broad wall of the larger waveguide, a WR-90 X-band waveguide. The WR-28 waveguide operating in the higher frequency band of the proposed antenna acts as a ridge inside the WR-90 waveguide operating in the lower frequency band. For achieving a suitable side lobe level (SLL) and cross-polarisation in the lower frequency band, the slots are placed close to the higher frequency waveguide and side ridges are placed beside each slot. A 2D graph is presented in which the normalised resonance conductance versus the offset of a side ridge from the outer edge of the lower frequency waveguide is shown, while the slot is located between the higher frequency waveguide and the side ridge. By applying proper coefficients to this graph, appropriate offsets from the outer edge of the lower frequency waveguide for the side ridges are obtained so that a low SLL can be realised.

Antenna array is formed by assembly of radiating elements in an electrical or geometrical configuration. In most cases the elements are identical. In this paper proposed a very simple and powerful method for the synthesis of linear array antenna and GA. This method reduced the desired level of side lobe level (SLL) as well as to steer the main beam at different-different angle. A new method for adaptive beam forming for a linear antenna arrays using genetic algorithm (GA) are also proposed. Aditya Sharma | Er. Praveen Kumar Patidar"Review on Linear Array Antenna with Minimum Side Lobe Level Using Genetic Algorithm" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14544.pdf