Repozytorium publikacji - Politechnika Gdańska

Design of compact wideband circularly polarized (CP) antennas is challenging due to the necessity of simultaneous handling of several characteristics (reflection, axial ratio, gain) while maintaining a small size of the structure. Antenna re-design for various operating bands is clearly more difficult yet practically important because intentional reduction of the bandwidth (e.g., by moving the lower edge of the operating band up in frequency) may lead to a considerable size reduction, which can be beneficial for specific application areas. This paper proposes a rigorous approach to rapid re-design of miniaturized CP antennas involving inverse surrogate models and fast electromagnetic (EM)-based parameter tuning. Our methodology allows for a precise control of the lower operating frequency of the CP antenna (both in terms of the impedance and axial ratio bandwidth) and accomplishing the geometry parameter scaling at an extremely low cost of a few EM analyses of the structure at hand. Our methodology is demonstrated by re-designing a compact wide slot CP antenna in the range of 3.2 GHz to 5.8 GHz. The proposed approach can be used for fast rendering of the bandwidth/size trade-offs (the footprints obtained for the verification structure range from 783 mm2 to 482mm2), thus determining the most suitable designs for particular applications. The numerical findings are validated experimentally.

Autorzy

• Ullah Ubaid,
• prof. dr inż. Sławomir Kozieł link otwiera się w nowej karcie ,
• Ismail Mabrouk