Development of active loop antennas for 2-30 MHz
Development of active loop antennas for 2-30 MHz
Active antennas using a single balanced loop, and ar omnidirectional crossed loop arrangement have been constructed, up to 160 cm diameter, for reception in the frequency band 2-30 MHz. Their performance has been investigated theoretically and experimentally. 160 cm active loop antennas are atmospheric noise limited for approximately 75% of time, according to C.C.I.R. noise data. Under conditions of minimum atmospheric noise (less than 25% of time) their performance is short by 7-11 dB of that ideal goal, and so, for that matter is a 160 cm active monopole. Linear amplifiers using bipolar transistors, accommodating signals up to 5,V/m, have been developed; there is the possibility of increasing this figure up to 10 or 1S V/m. Noise in transistors has been investigated and this has led to the development of amplifiers with improved signal to noise ratio for active antennas. Performance of active loop antennas has been compared theoretically and experimentally with that of active monopoles, and it has been shown that approximately equal signal to noise ratio is obtained for either of these electromagnetic sensors when their overall dimensions (diameter and height) are similar.
University of Southampton
1977
Woroncow, Aleksander
(1977)
Development of active loop antennas for 2-30 MHz.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Active antennas using a single balanced loop, and ar omnidirectional crossed loop arrangement have been constructed, up to 160 cm diameter, for reception in the frequency band 2-30 MHz. Their performance has been investigated theoretically and experimentally. 160 cm active loop antennas are atmospheric noise limited for approximately 75% of time, according to C.C.I.R. noise data. Under conditions of minimum atmospheric noise (less than 25% of time) their performance is short by 7-11 dB of that ideal goal, and so, for that matter is a 160 cm active monopole. Linear amplifiers using bipolar transistors, accommodating signals up to 5,V/m, have been developed; there is the possibility of increasing this figure up to 10 or 1S V/m. Noise in transistors has been investigated and this has led to the development of amplifiers with improved signal to noise ratio for active antennas. Performance of active loop antennas has been compared theoretically and experimentally with that of active monopoles, and it has been shown that approximately equal signal to noise ratio is obtained for either of these electromagnetic sensors when their overall dimensions (diameter and height) are similar.
This record has no associated files available for download.
More information
Published date: 1977
Identifiers
Local EPrints ID: 467255
URI: http://eprints.soton.ac.uk/id/eprint/467255
PURE UUID: 0919a3c0-0937-4110-aaba-445982051ca7
Catalogue record
Date deposited: 05 Jul 2022 08:17
Last modified: 05 Jul 2022 08:17
Export record
Contributors
Author:
Aleksander Woroncow
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics