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Improvement of traveling wave waveguide slot array antenna for reducing side lobe level and cross polarzation
Mohammad Hadi Moradi Ardekani
Slot antennas were introduced around 1943 at the Mc Gill University. Simple structure, high efficiency and linear polarization of these radiators make them popular for many radar applications. For vertical polarization and wide scan angle, the slots on the narrow side of the waveguides are used. A common form of these slots are inclined slots. coupling between the adjacent elements affects considerably the side lobe level. For the slots in the narrow side of the waveguide, an accurate formulation is not available since the extension of the slot lengths into the wide side part of the waveguide, makes the analytical analysis difficult. In this case results of measurements are usually used which are costly. In this work using CST – Microwave Studio CAD tool which is a full wave numerical field solver, the conductances and resonant lengths of the slots are calculated taking the coupling effects into account by adopting periodic boundary condition. A curve of conductance for different elements is provided and is used for the design of a travelling wave slot array with low side lobe level.The inclination of the slots increases the cross polarization. In this worka non-inclined slot type is proposed which presents much lower cross polarization. The proposed structure is easy to fabricate and has the advantage of being tunable with low sensitivity to fabrication tolerances. In this case also a design curve is provided for the slot conductances , which takes the mutual couplings between the slots into account.The designed array using this type of slot is compared with the inclined design to show the improvement of the cross polarization.
Keywords : slot array , side lobe level , cross polarization , traveling wave
Faculty of Electrical and Computer Engineering
M.S. Thesis in Communication Engineering
Imrovment of traveling wave waveguide slot array antenna for reducing side lobe level and cross polarization
Mohammad Hadi Moradi Ardekani
Dr. H. Abiri
8Slot waveguide array
12Side lobe level
16- Band width
17- Return loss
18 – Radiation pattern
19- Far field
سایت ما حاوی پایان نامه های زیادی است – می توانید جستجو کنید :
22- Omni directional
32 Free space wave length
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