Journal ArticleDOI
A Non-Foster VHF Monopole Antenna
TLDR
In this paper, a 15-cm monopole antenna was matched using a variable negative capacitance based on Linvill's balanced negative impedance converter, and the realized gain was improved by 10 dB relative to the unmatched case over 30-200 MHz.Abstract:
Non-Foster matching promises to improve the performance of electrically small antennas by tens of decibels over a decade of bandwidth, but only a few successful demonstrations have been reported in the literature. A 15-cm monopole antenna has been matched using a variable negative capacitance based on Linvill's balanced negative impedance converter. The realized gain is improved by >;10 dB relative to the unmatched case over 30-200 MHz. This letter reports the design, simulation, and measurement data and gives an equivalent circuit that can be used to synthesize future designs.read more
Citations
More filters
Journal ArticleDOI
Electrically Small, Broadside Radiating Huygens Source Antenna Augmented With Internal Non-Foster Elements to Increase Its Bandwidth
TL;DR: In this paper, a broadside radiating, linearly polarized, electrically small Huygens source antenna system that has a large impedance bandwidth is reported, which is facilitated by embedding non-Foster components into the near-field resonant parasitic elements of this metamaterial-inspired antenna.
Journal ArticleDOI
Gain and Noise Analysis of Non-Foster Matched Antennas
TL;DR: The results indicate that for receivers with low-noise floor levels, a receiving system consisting of a passive small antenna and an amplifier can provide better SNRs compared with a receive system with a non-Foster matched small antenna.
Journal ArticleDOI
UHF Electrically Small Box Cage Loop Antenna With an Embedded Non-Foster Load
TL;DR: In this article, the design of an electrically small box cage loop antenna (ka ~ 0.37) is compared with a negative impedance converter (NIC) circuit realization.
Journal ArticleDOI
Improved Signal-to-Noise Ratio, Bandwidth-Enhanced Electrically Small Antenna Augmented With Internal Non-Foster Elements
TL;DR: In this paper, a non-Foster element was embedded into the near-field resonant parasitic element of a metamaterial-inspired antenna to achieve a 5-times enhancement of its −10 dB fractional bandwidth.
References
More filters
Book
Microwave Transistor Amplifiers: Analysis and Design
TL;DR: In this article, the authors derived the Input and Output Stability Circles and the Unilateral Constant-Gain Circles from two-port Matching Networks and Signal Flow Graphs.
Journal ArticleDOI
Transistor Negative-Impedance Converters
TL;DR: The physical characteristics of transistors, compactness, long life, simple power requirements, plus constancy of pertinent electrical parameters enhance their practical utility in the production of negative impedances.
Journal ArticleDOI
Non-Foster Impedance Matching of Electrically-Small Antennas
S.E. Sussman-Fort,R.M. Rudish +1 more
TL;DR: In this paper, the authors present the non-Foster impedance matching, which employs active networks of negative inductors and capacitors to bypass the restrictions of gain-bandwidth theory.
Proceedings ArticleDOI
Non-Foster impedance matching of electrically small antennas
Keum Su Song,Roberto G. Rojas +1 more
TL;DR: In this paper, the authors proposed impedance matching networks (MNs) to maximize the transfer of power from a resistive source to the highly reactive antenna to reduce the radiation quality factor of small antennas.