Journal ArticleDOI
The electrically small magnetically loaded multiturn loop antenna
R. DeVore,P. Bohley +1 more
Reads0
Chats0
TLDR
In this paper, an analytical model of a class of electrically small multiturn loop antennas has been formulated and compared with experimental measurements over a frequency range of 3 to 86 MHz.Abstract:
An analytical model of a class of electrically small multiturn loop antennas has been formulated and compared with experimental measurements over a frequency range of 3 to 86 MHz. Both air core and magnetically loaded eases were examined. Transmitted signal enhancement as high as 10 dB was predicted and observed by magnetic loading. Several interesting properties of the transmitting antenna were investigated experimentally and by analysis based upon the model. It is concluded that transmitted signals can be enhanced in the 2-30 MHz range, at reasonable power levels, as much as 10 dB with state-of-art ferrite materials. Secondly, the analytical model described in this paper should prove an effective design aid for a volumetrically constrained antenna of the class.read more
Citations
More filters
Journal ArticleDOI
Experimental Validation of Performance Limits and Design Guidelines for Small Antennas
Daniel F. Sievenpiper,David Carlos Dawson,Minu M. Jacob,Tumay Kanar,Sanghoon Kim,Jiang Long,Ryan Quarfoth +6 more
TL;DR: In this article, the theoretical performance limit for small antenna performance has been validated by all available experimental evidence and the theoretical predictions for the performance due to design factors such as permittivity, aspect ratio, and the internal structure of the antenna are also supported by the experimental evidence.
Journal ArticleDOI
The Electrically Small Multi-Turn Loop Antenna with a Spheroidal Core
Ted Simpson,Yanjie Zhu +1 more
TL;DR: In this article, a complete analysis of the electrically small multi-turn loop antenna with a spheroidal core is presented, using quasistatic electromagnetic theory (QS) for later use in conjunction with a large finite-element program for full-wave analysis of a practical loop with a cylindrical core.
Journal ArticleDOI
Mechanical Magnetic Field Generator for Communication in the ULF Range
TL;DR: In this article, a ULF magnetic field generator has been created using a rotating permanent magnet, which can be shown that the proposed field generator outperforms a conventional coil source (23 dB of field strength for the same volume and dissipated power that is 0.35 W).
Journal ArticleDOI
Why the Magnetic Loss Tangent Is Not a Relevant Constraint for Permeable Conformal Antennas
TL;DR: In this paper, it was shown that the key material parameter controlling the radiation efficiency of these antennas is not the loss tangent but the maximum of the Heaviside magnetic conductivity, a quantity proportional to Snoek's product.
References
More filters
Journal ArticleDOI
Two methods for the measurement of antenna efficiency
E.H. Newman,P. Bohley,C. Walter +2 more
TL;DR: The Wheeler method and the Q method are used to find the efficiency of electrically small multiturn loop antennas and are applicable at VHF and frequencies below where the design of an antenna range or anechoic chamber becomes increasingly difficult and expensive.
Proceedings ArticleDOI
Electrically small, ferrite-loaded loop antennas
V. Rumsey,W. Weeks +1 more
TL;DR: In this article, approximate formulas for the impedance, efficiency, and Q of electrically small, ferrite-loaded loop antennas have been developed for the antenna without ferrite loading.
Proceedings ArticleDOI
On ferrite loop antenna measurements
TL;DR: In this paper, a general procedure for simplified testing of ferrite-loaded magnetic-type small antennas is outlined in which radio-frequency radiation performance is expressed in terms of quantities easily measured at audio frequencies.