Publications Repository - Gdańsk University of Technology

A compact broadband wide-slot circular polarization (CP) antenna is proposed. An inverted L-shape parasitic strip at the open end of a microstrip line extension and a slot modification is applied to attain wideband CP. The advantage of this technique is simplicity which makes it readily re-designable for different frequency bands. To demonstrate the concept, three designs working at different frequencies are obtained. The redesign procedure is straightforward and only requires a recalculation of the selected physical dimensions followed by EM-based parameter tuning. A compact size of 0.09λ0 is achieved when measured at the lowest CP frequency. The optimized designs are validated experimentally in terms of |S11| , axial ratio (AR), realized gain, and radiation patterns. For the design corresponding to the lowest operating frequency, a total impedance bandwidth of ∼89-percent (3.2 GHz- 8.4 GHz), ARBW ≤3dB of 82-percent (3.2 GHz to 7.65 GHz), average in-band realized gain of 3.3 dBi, and a bidirectional radiation pattern with a dual sense of polarization is achieved. A thorough benchmarking indicates the superiority of the proposed antenna over the state-of-the-art designs in terms of all major performance figures.

Authors

• Ubaid Ullah,
• prof. dr inż. Sławomir Kozieł link open in new tab ,
• Ismail Mabrouk