Tilted Beam Formation Using Parasitic Loop-Based Plates

• Published in: IEEE antennas and wireless propagation letters Vol. 15; pp. 1475 - 1478
• Main Authors: Nakano, H., Toida, M., Okabe, S., Yamauchi, J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna radiation patterns; Arrays; Gain; loop-based plates; Patch antennas; phase gradient; Phase shifters; Strips; Tilted beam formation; tilted dual beam; tilted dual beam; Loop-based plates; phase gradient; tilted beam formation
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2015.2513671

An antenna system that forms a high-gain tilted beam is discussed. This system is composed of a single-feed antenna with a wide beam and two parasitic loop-based plates, P l and P u (two-plate system), where the widths of the strip loops differ. The electromagnetic wave from the fed patch experiences a phase shift through P l and P u . It is predicted that the two-plate system creates a tilted beam whose tilt angle is larger than a conventional one-plate system (where plate P u is absent). Full-wave analysis [finite-difference time-domain (FDTD) analysis] confirms this prediction using a patch antenna as the fed antenna. In addition to radiation pattern analysis, the gain and VSWR are investigated. Subsequently, the two-plate system is successfully applied to the formation of a tilted dual beam.