A Compact Outer-Fed Leaky-Wave Antenna Using Exponentially Tapered Slots for Broadside Circularly Polarized Radiation
Journal
Ieee Transactions on Antennas and Propagation
Journal Volume
60
Journal Issue
6
Pages
2654-2661
Date Issued
2012
Author(s)
Lin, S. K.
URI
Abstract
A novel leaky-wave slot antenna for broadside circularly polarized (CP) radiation is presented. The antenna simply consists of a slotline for the feed, an exponentially tapered slot for the radiator, and a shaped end for the terminator. Separating the feed from the curved radiating slot makes the presented antenna unique in design and compact in size. The resulting antenna yields inherent broadband characteristics of leaky-wave antennas on the input impedance, axial ratio (AR), and radiation gain. Particularly, to solve the tilt-beam problem commonly seen in leak-wave antennas, we proposed an extended dual-slot design that successfully achieved the pattern stability over a wide bandwidth. An antenna module with a reflector for unidirectional pattern applications was also developed. The measured performances of the final prototype were found to exhibit 10-dB return loss bandwidth of 40%, 3-dB AR bandwidth of 53%, and half-power gain bandwidth of 59% with CP gain level about 8 dBic. The measured and simulated results were well consistent with each other. © 2012 IEEE.
Subjects
Broadband; circular polarization; leaky-wave antennas; slot antennas; unidirectional patterns
SDGs
Other Subjects
Antenna modules; Axial ratio; Broadband; Broadband characteristics; Circularly polarized; Gain bandwidth; Input impedance; Leaky wave antennas; Leaky-wave; Pattern stability; Radiating slot; Radiation gain; Return loss bandwidth; Simulated results; Slotlines; Tapered slots; Unidirectional patterns; Wide bandwidth; Antenna arrays; Bandwidth; Circular polarization; Dipole antennas; Microwave antennas; Slot antennas; Directional patterns (antenna)
Type
journal article