Dualband and Tunable Beam Tilting Wideband High Gain Compact Endfire Antennas Based on Spoof Surface Plasmon Polaritons

This paper proposes dualband and tunable beam tilting wideband high-gain compact end-fire antennas based on Spoof Surface Plasmon Polaritons (SSPPs). Corrugated SSPPs are printed on the opposite face of the substrate to obtain compactness, dualband, and stable radiation characteristics. Tall-thin rectangular slots are added to the radiator of the dual-band antenna to enhance impedance matching and provide wideband characteristics. The proposed dual band antenna operates in two separate frequency bands (4.3-4.65 and 5.75-5.95 GHz) with a maximum gain of 9.5 and 10.5 dBi, while the wideband antenna works 4.2 to 5.5 GHz with a maximum gain of 9.2 dBi. Furthermore, the wideband antenna has a beam tilting capacity of 20 degrees between 4.25 and 5.45 GHz. The antennas have high efficiencies and stable end-fire radiation characteristics with 1.5-2.3 dBi gain variations in all operating bands. The antennas have fairly compact sizes, with a width of 39 mm and a length of 65 mm. They are suitable for next-generation satellite communications, Unmanned Aerial Vehicles (UAVs), and radar systems in microwave bands.