Cross-Dielectric-Slab-Loaded Archimedean Spiral Antenna

Abstract

In this letter, a cross dielectric slab loaded Archimedean spiral antenna (SLASA) is investigated. Cross dielectric slab (CDS) is made by two slabs (plates) of FR-4 dielectric material (dielectric constant 4.3 and loss tangent 0.025) fixed vertically at 90 degree to each other, and attached on the top of the Archimedean spiral antenna. It is found that, the dielectric slab significantly enhances gain of the Archimedean spiral antenna (ASA) in the bandwidth of 6:1. The gain increases with frequency, without affecting the 3 dB axial ratio in the operating frequency band. The CDS is a light weight structure having low fabrication cost. The measured S11, input impedance and radiation pattern are presented to support the efficacy of the proposed structure.Index Terms-Archimedean spiral antenna, cross dielectric slab, gain, axial ratio.

A unidirectional ultra‐wideband circularly polarized spiral antenna array

“…Archimedean spiral antenna [5][6][7][8][9][10][11] is widely used in wireless communication systems because of the constant input impendence and circularly polarized radiation over a wide frequency bandwidth. Meanwhile, some disadvantages, such as bidirectional radiation, input impendence of 188 Ω, and large profile, cannot be ignored.…”

A New Method for Reducing the Input Impedance of the Archimedean Spiral Antenna

“…Several papers have been published on the topic of spiral antennas [2][3][4][5]. For its prominent features like consistent input impedance and invariable circularly polarized radiation, it is widely used in high-speed wireless communication, high-resolution radar and airborne applications [6,7]. It is also has some disadvantages such as bidirectional radiation, larger size, and input impedance is not equal to 50 Ω [8].…”