Dielectric-rod aerials
01 Dec 1947-Journal of the Institution of Electrical Engineers - Part IIIA: Radiocommunication (IET)-Vol. 94, Iss: 14, pp 610-618
TL;DR: In this paper, the fundamental principles governing the radiation characteristics of dielectric rods are considered, and brief reference is made to other Dielectric aerials, and the material of German origin is taken mainly from a translation by the authors of a paper by Mallach of the Vierjahresplan Institut fur Schwingungsforschung, Berlin.
Abstract: This paper describes theoretical and experimental work carried out in the Admiralty Signal Establishment, and at the same time includes all the relevant material that the authors have been able to extract from German reports. It was decided to carry out this investigation when it became known that considerable importance had been attached to dielectric-rod aerials in Germany during recent years. The material of German origin is taken mainly from a translation by the authors of a paper by Mallach of the Vierjahresplan Institut fur Schwingungsforschung, Berlin.The fundamental principles governing the radiation characteristics of dielectric rods are considered, and brief reference is made to other dielectric aerials.
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19 May 2021
TL;DR: In this article, a dielectric rod antenna array with a slot antenna radiators without the use of a metallic waveguide is presented, which can be integrated with a planar radiator feed and used effectively in an array configuration.
Abstract: A dielectric rod antenna array fed by slot antenna radiators without the use of metallic waveguide is presented here. Communication systems, especially those related to 5G, are moving up into mm-wave bands where metal losses can become significant and many traditional fabrication and manufacturing techniques become more difficult. Dielectric rod antennas (DRA) are entirely made of dielectric and may be injection-molded or 3D-printed as solid rods, layered rods, or tubes. While the normal approach to feeding DRAs involves some version of metallic waveguide, we show here that the DRA may be integrated with a planar radiator feed and used effectively in an array configuration. The array demonstrated is a $2 \times 2$ array designed for operation at 15 GHz. Each DRA is $6\lambda $ long. The array is fabricated on a 100 mm $\times$ 100 mm substrate with 52 mm separation between elements. The array radiation efficiency is 80% for an array gain of 19 dBi.
7 citations
TL;DR: An analysis of the ratios of the di− and tri−atomic ions of hydrogen, deuterium, and H-D mixtures obtained from a hot-cathode arc discharge in a magnetic field was used to examine the nature of ionic collision and displacement processes.
Abstract: An analysis of the ratios of the di‐ and tri‐atomic ions of hydrogen, deuterium, and H—D mixtures obtained from a hot‐cathode arc discharge in a magnetic field was used to examine the nature of ionic collision and displacement processes Ion mobility, and consequently the rate of ion‐molecule collisions, at constant pressure, were controlled by varying the intensity of the magnetic field Statistical treatment of mass spectrograph data indicates that the formation of H3+ is due to the reaction H2++H2→H3++H and that the ion rather than the molecule undergoes dissociation on collision
7 citations
TL;DR: In this article, the radiation patterns of three series of dielectric rod antennas of circular cross section excited in the TM01 mode at a frequency of 9275 mcps were measured.
Abstract: The radiation patterns were measured for three series of dielectric rod antennas of circular cross section excited in the TM01 mode at a frequency of 9275 mcps. Only one parameter was changed in each series of rods so that the effect of this parameter on the pattern could be studied. Dielectric antennas excited in the TM01 mode have a null in the radiation pattern in the forward direction. It was found that maximum attenuation of secondary lobes was obtained using large diameter rods but sharper and deeper central nulls were obtained with small diameter rods. It was also noted that the deepest central null was obtained using a rod of uniform cross section. For uniformly tapered rods of various lengths, the maximum secondary lobe attenuation as well as the sharpest and deepest central null was obtained using the longest rod. The radiation patterns of the antennas excited in the TE01 mode were of the same nature as those obtained using the TM01 mode. Measurements were made also of the electric field strengt...
4 citations
02 May 2013
TL;DR: Antenna discussed here was actually designed and measured for Ku band (12-14GHz) but simulated results reveal that it can exhibit broadband characteristics and can cover the range beyond 10-30GHz at either end.
Abstract: Dielectric rod antenna (DRA) has been used as an alternate feed system for the reflector antennas. Simulated and measured radiation characteristics for dielectric rod antenna have been discussed and compared. It is a cylindrical Teflon rod tapered from the radiating end and fed by a circular metallic waveguide. Such antennas are being used for their manufacturing simplicity, light weight, broadband characteristics and relatively higher gain and directivity as compared to horn antennas. Antenna discussed here was actually designed and measured for Ku band (12–14GHz) but simulated results reveal that it can exhibit broadband characteristics and can cover the range beyond 10–30GHz at either end.
4 citations