DocumentCode :
3240240
Title :
HF array simulations
Author :
Koert, Peter ; Cha, James ; Elliot, Paul
Author_Institution :
Adv. Power Technol. Inc., Washington, WA, USA
fYear :
1995
fDate :
17-19 May 1995
Firstpage :
233
Lastpage :
236
Abstract :
The Ionospheric Research Instrument (IRI) is an HF transmitting array facility currently being constructed in Gakona, Alaska, as part of the HF Active Auroral Research Program (HAARP). This program will result in an ionospheric heater facility in the auroral region, dedicated to the exploration of ionospheric phenomena that can be induced by ionospheric modification. For an HF array where the transmitter output stage is a tuned high power vacuum tube, the stability and tunability of each transmitter tube presents a complex problem because of array coupling. We have modeled a (3×3) HF array with transmitters, baluns, antenna matching units, and antennas. Transmitter models were based on EIMAC 10 kW tetrodes with tuning networks, and antenna models were simply S-parameter files obtained from NEC calculations as well as measurements on 7×7 and 3×3 cross dipole arrays. The simulations were performed using HP-EEsof Libra, which can accommodate up to 99 ports, where each port is an element of the array. We present the results characterizing the stability conditions for operating the transmitters in a highly coupled antenna array environment
Keywords :
HF radio propagation; S-parameters; digital simulation; dipole antenna arrays; electrical engineering; electrical engineering computing; impedance matching; ionospheric electromagnetic wave propagation; radio transmitters; simulation; stability; tetrodes; tuning; 10 kW; EIMAC 10 kW tetrodes; HAARP; HF Active Auroral Research Program; HF array simulations; HP-EEsof Libra; Ionospheric Research Instrument; NEC calculations; S-parameter files; antenna matching unit; antenna models; array coupling; baluns; coupled antenna array environment; cross dipole arrays; ionospheric heater facility; measurements; stability conditions; transmitter models; transmitter tube; tunability; tuned high power vacuum tube; tuning networks; Antenna arrays; Dipole antennas; Electron tubes; Hafnium; Impedance matching; Instruments; Scattering parameters; Stability; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Systems Conference, 1995. Conference Proceedings., IEEE NTC '95
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-2591-1
Type :
conf
DOI :
10.1109/NTCMWS.1995.522894
Filename :
522894
Link To Document :
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