Design of cavity-backed spiral antennas

Abstract

In this paper, the design procedure of the 2-18 GHz and the 18-40 GHz cavity-backed spiral antenna is described. By varying the antenna parameters the VSWR and the axial ratio characteristics of the antenna are investigated. For the 2-18 GHz spiral antenna, the solid absorber and the Marchand balun are applied. The measured results of the fabricated antenna are compared with the simulated ones. For the 18-40 GHz antenna, the honeycomb absorber having variable loss tangent is considered in simulation to investigate for improvement of the VSWR and the axial ratio characteristics.

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.…”

“…To obtain unidirectional radiation, high impedance surface segments instead of planar metal reflectors have been proven to enhance gain in the operating range. Besides, a cavity filled with absorbing material has been placed under spiral aperture to absorb the back‐lobe radiation. What is more, sequentially rotated antenna array is another effective way to increase AR bandwidth and obtain high gains.…”

Design and performance of a flexible metal mountable UHF RFID tag

“…Many metal mountable passive UHF RFID tags have been proposed in literature in recent years. Those tags are designed based on electronic band gap (EBG) substrate [9], cavity backed antennas ( [3], [13]), high-permittivity Ceramic-Polymer composite substrate [16]. In recent years, many metal mountable passive UHF RFID tags have been designed and made commercially available.…”

Hybrid Utilization of Loading Techniques and Cavity Groove for Performance Enhancement of the UWB (2–18 GHz) Spiral Antenna

“…In our case, we chose a honeycomb absorber (HC-55175, ARC Tech.) and modelled it in HFSS as a solid material with E r 1.5 and tan δ 0.5 [8].…”

“…5 International Journal of Antennas and Propagation fabricated using the LPKF PCB rapid prototyping machine. Honeycomb absorber was used and modelled as a solid material (E r 1.5, loss tangent 0.5) [8] in HFSS. The balun was passed through the hole made in the honeycomb absorber till the cavity base.…”