A compact circularly-polarized array based on superdirective elements

In this paper, a new strategy for designing compact Circularly-Polarized (CP) arrays is proposed. This approach consists of using small parasitic superdirective arrays as unit elements. An array is designed for 866MHz RFID band and a parametric analysis on the inter-element distance is performed to highlight the trade-offs between the antenna-dimensions, -directivity and radiation efficiency. For total dimensions of 220 × 220 × 25.8mm3(0.58λ × 0.58λ × 0.075λ), the array has a CP directivity of 10.3dBic and a radiation efficiency of 38.5%.

[1]  O. Breinbjerg,et al.  Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements , 2012, IEEE Transactions on Antennas and Propagation.

[2]  S. Collardey,et al.  Superdirective metamaterial-inspired electrically small antenna arrays , 2013, 2013 7th European Conference on Antennas and Propagation (EuCAP).

[3]  Antonio Clemente,et al.  Design of a Super Directive Four-Element Compact Antenna Array Using Spherical Wave Expansion , 2015, IEEE Transactions on Antennas and Propagation.

[4]  Abdullah Haskou,et al.  Compact planar arrays based on parasitic superdirective elements , 2016, 2016 10th European Conference on Antennas and Propagation (EuCAP).

[5]  Hao Ling,et al.  Design of electrically small Yagi antenna , 2007 .

[6]  T.H. O'Donnell,et al.  Electrically small superdirective arrays using parasitic elements , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[7]  Arthur D. Yaghjian,et al.  Electrically small supergain end‐fire arrays , 2007, 0708.1988.

[8]  Abdullah Haskou,et al.  Design of Small Parasitic Loaded Superdirective End-Fire Antenna Arrays , 2015, IEEE Transactions on Antennas and Propagation.

[9]  T.H. O'Donnell,et al.  A monopole superdirective array , 2005, IEEE Transactions on Antennas and Propagation.