A new approach to active antenna design

Nordholt, E.H.; Willigen, Durk van

doi:10.1109/tap.1980.1142418

Cited by 22 publications

(2 citation statements)

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“…In the seventies of the last century the availability of new generation low-noise transistors stimulated the intensive development of theory and practice of smallsize HF active antennas (Meinke, 1976;Nordholt and VanWilligen, 1980;Sainati and Fessenden, 1981;Sainati, 1982). It enabled one to appreciably reduce the size of antennas while retaining their high efficiency that was characterized in radio communication systems by the voltage increase at the input of low-resistance receiver as compared with using passive antennas.…”

Section: Elaboration and Calculation Of Compact Active Dipolementioning

confidence: 99%

Thirty-Element Active Antenna Array as a Prototype of a Huge Low-Frequency Radio Telescope

et al. 2003

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An effective wide-band (10 to 60 MHz) active antenna element has been developed. The cost of one short (3 m), thin dipole with built-in amplifier and metal construction is less than 45 euro. It was shown both theoretically and experimentally that the upper limiting frequency is at least 60 MHz, the dynamic range is 90 dB/µV and the share of the amplifier noise to the background antenna temperature is about 10%. The developed active dipole was tested by building a 30-element antenna array and comparing its parameters with one of the subpart of the UTR-2 radio telescope having passive dipoles of 8.6 m in length and 1.8 m in diameter. The 3C461 ionospheric scintillation spectra observed in the experiments show that the sensitivities and noise-immunities of both antennas are close. This proves the availability using of a short cheap active dipole in new generation giant radio telescopes.

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Section: Elaboration and Calculation Of Compact Active Dipolementioning

confidence: 99%

Thirty-Element Active Antenna Array as a Prototype of a Huge Low-Frequency Radio Telescope

et al. 2003

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“…f, where α = 3 corresponds to nominal naïve inversion complexity, see footnote 1 2. Inversion is carried out by the MATLAB function inv with N = 128.…”

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confidence: 99%

Conversion Matrix Method of Moments for Time-Varying Electromagnetic Analysis

Bass,

Palmer,

Schab

et al. 2021

Preprint

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A conversion matrix approach to solving network problems involving time-varying circuit components is applied to the method of moments for electromagnetic scattering analysis. Detailed formulations of this technique's application to the scattering analysis of structures loaded with time-varying circuit networks or constructed from general time-varying media are presented. The computational cost of the method is discussed, along with an analysis of compression techniques capable of significantly reducing computational cost for partially loaded systems. Several numerical examples demonstrate the capabilities of the technique along with its validation against conventional methods of modeling time-varying electromagnetic systems, such as finite difference time domain and transient circuit co-simulation.

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Navigation with Low‐Frequency Radio Signals

Pelgrum¹,

Schue²

2020

Position, Navigation, and Timing Technologies in the 21st Century

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A new approach to active antenna design

Cited by 22 publications

References 1 publication

Thirty-Element Active Antenna Array as a Prototype of a Huge Low-Frequency Radio Telescope

Thirty-Element Active Antenna Array as a Prototype of a Huge Low-Frequency Radio Telescope

Conversion Matrix Method of Moments for Time-Varying Electromagnetic Analysis

Navigation with Low‐Frequency Radio Signals

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