کنفرانس مهندسی برق ایران

صفحه اصلی / سی امین کنفرانس بین المللی مهندسی برق

Low-cost Broadband Reflectarray Antenna Using Cross Bow-Tie elements

نویسندگان :

Mahdieh Bozorgi¹ Mahmood Rafaei-Booket²

1- دانشگاه زنجان 2- دانشگاه زنجان

کلمات کلیدی :

Broadband Reflectarray،Phase Realization Method،Low-cost Antenna،Cross Bow-tie Unit Cell.

چکیده :

A class of Bow-tie unit cell on FR4 substrate is designed and investigated to be used for implementation of a single-layer broadband Reflectarray Antenna (RA). In analysis step, two different parameters (length and angle) of the grounded Cross Bow-Tie (CBT) are varied to obtain the phase diagrams. Various degrees of freedom in the CBT structure are very helpful in the design of a broadband RA. In the antenna design procedure, an efficient phase synthesis technique is applied to minimize the adverse effects of frequency dispersion causing by the differential space phase delay at different frequencies within working bandwidth. This technique optimizes the metallic CBTs arrangement on the aperture of RA, and reduces the dependency of RA design to the CBT’s phase variation. Consequently, combination of the CBT’s phase behavior and the phase synthesis technique leads to designing a broadband RA with a good frequency response. In addition to, the Side Lobe Level (SLL) of the resultant RA is reduced remarkably. For validation of the obtained numerical results, an RA is designed and fabricated in 9.3~11.6GHz frequency bandwidth. The measurements show 26.9dB as a maximum gain value at 10.5 GHz with a 3dB gain bandwidth of 22%. It is also shown that the implemented RA exhibits a reduced SLL (<-18dBi) within its operating bandwidth.