Effective area of search coil increased Input impedance presented by operational amplifier and associated components nearly balances out impedance of search coil Fluctuations in ambient magnetic field induce large currents in search coil

A broadband transmitter antenna for an ionospheric sounder at the Alfven Laboratory in Stockholm is designed. Various broadband antenna types are examined for their broadband features as well as their geometry. A segmentation method for the simulation of broadband antennas is derived and verified. The impact of surrounding buildings and ground on antenna performance is simulated. Three different frequency independent antenna types, a log-periodic dipole array, a pyramidal log-spiral and a log-periodic zigzag antenna are modeled and simulated for frequencies from 2 to 20 MHz. A log-periodic zigzag antenna is optimized and provides reasonable input impedance over the entire bandwidth at a standing wave ratio of less then 2:1. Construction material is selected and the antenna is constructed.

Broadband Active Antenna

Citations

A Broadband Antenna for Ionospheric Sounding

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