Title :
Design of a Broadband Cosecant Squared Pattern Reflector Antenna Using IWO Algorithm
Author :
Dastranj, Aliakbar ; Abiri, Habibollah ; Mallahzadeh, Alireza
Author_Institution :
Sch. of Electr. & Comput. Eng., Shiraz Univ., Shiraz, Iran
fDate :
7/1/2013 12:00:00 AM
Abstract :
A cosecant squared pattern reflector antenna fed by a pyramidal double-ridged horn for 2-18 GHz is presented. Invasive weed optimization (IWO) algorithm is used for synthesizing the point source doubly curved reflector antenna. IWO method makes antenna synthesis flexible to achieve extra desired features such as low side lobe level (SLL) and low ripples in the shaped beam region. The simulation results via FEKO software package further prove the validity and versatility of this technique for solving reflector synthesis problems. In addition, experimental investigations are conducted to understand the complete reflector antenna system behaviors. Good agreement between the simulation and measurement has been achieved. The ripple in the cosecant squared region and the SLL is less than 1.5 dB and 25 dB, respectively. Based on the obtained results, the proposed reflector antenna can be used in broadband surveillance-search radar systems.
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; horn antennas; microwave antennas; optimisation; reflector antenna feeds; FEKO software package; IWO algorithm; SLL; antenna fed; broadband cosecant squared pattern reflector antenna; doubly curved reflector antenna; frequency 2 GHz to 18 GHz; invasive weed optimization; point source; pyramidal double-ridged horn; shaped beam region; side lobe level; Antenna measurements; Antenna radiation patterns; Broadband antennas; Feeds; Optimization; Radar antennas; Reflector antennas; Cosecant squared pattern; GO method; IWO algorithm; pattern ripple; reflector antenna;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2013.2254439
