An improved method of reducing the input impedance of a four-arm sinuous antenna is demonstrated for a wide gain bandwidth. The proposed antenna has a dual-linear polarized response for electronic support measures (ESM) systems and is designed with a planar substrate. The structure for reducing the input impedance is developed based on the transmission and coupled line theory and is shown to be in excellent agreement with theoretical predictions. The proposed antenna achieves an impedance bandwidth in the range of 0.45-6 GHz with a reference impedance of 100 ~Omega . Simulations for comparison according to the difference in input impedance of designed antennas with feeding structures are also presented. Finally, the performance of the fabricated antenna with wideband balun is verified by measuring co- and cross-polarization radiation patterns. As a result, the proposed antenna achieves a wide gain bandwidth (>2.5 dBi) and a cross-polarization isolation (>-13 dB) of more than 12:1 in the frequency range over 0.6 GHz, which can be used in ESM systems.
Bibliographical notePublisher Copyright:
© 2013 IEEE.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Computer Science(all)