Very Low Profile and Dielectric Loaded Feeder Antenna

Abstract

In this letter, very low profile planar horn antenna feeders are designed and measured. Using previous results of antennas consisting of a narrow slot on a metallic plane and flanked by two grooves, a further step is given here by reducing the thickness of the prototype. A key factor in the approach is the operation in the transversal slot resonance instead of the usual longitudinal slot resonance. Moreover, by inserting a dielectric material of relative permittivity r 1, the thickness can be further reduced, maintaining and even improving the radiation features of the prototype. Reducing the metallic plate thickness has important consequences in the weight and profile of the antennas, making them easy to handle and to fit into different structures. In addition, in ranges where the wavelength is of the order of centimeters, a thick metallic plate can be a serious drawback due to mechanical restrictions. In these cases the design following the rules given in this letter can alleviate this constraint.Index Terms-Corrugated plate, subwavelength aperture, very low profile feeder.

77-GHz High-Gain Bull’s-Eye Antenna With Sinusoidal Profile

“…It was also observed that including a small offset at the end of the disc, o 2 optimized termination for the travelling wave. As discussed in [6], [7], [14], broadside radiation takes place when the period of the corrugated structure is close to the wavelength, d  . With this condition, together with a proper grooves' dimensions tuning, the periodic structure radiates a narrow beam from the excitation of the n = -1 space harmonic (or Floquet mode).…”

“…central slot surrounded by annular corrugation), which was first presented in [15] and, soon after, in [6], by introducing a sinusoidal corrugation profile instead of the typical square corrugations or the recently investigated triangular corrugations [16]. A similar idea was also studied in [17], but there the surface was modulated by a sinusoidal spiral function, achieving a circularly polarized leaky wave antenna.…”

3-D-Printed 96 GHz Bull’s-Eye Antenna With Off-Axis Beaming

“…These antennas consist of a radiating slot surrounded by straight parallel [23]- [25] or annular concentric [26] corrugations. In the latter case, the structure is usually called Bull's-Eye (BE) antenna.…”

Miniaturized Dual-Band Aperture Coupled Microstrip Antenna Using Corrugated Ground

“…It has been demonstrated that this phenomenon can be applied to the design of microwave antenna for improved performance [6][7][8][9]. In [6], a bull's eye corrugated structure is used as the ground plane of a patch antenna.…”

“…Since the upper operating frequency of this antenna is determined by the metallic plate thickness, the profile of the antenna is 12 mm. Subsequently, a dielectric material with relative permittivity ε r > 1 is inserted into the grooves [8], and then the profile of this antenna can be further reduced.…”