Quadripole Antenna System
Dual (orthogonal) Short Dipoles
When combined with a dual ADC vector LF-HF SDR analog
or DSP techniques may be used to synthesize wave polarization and to
provide antenna beam forming. Because most if not all ionosperic
propagation involves RHCP and OHCP propagation modes, O and X waves,
these two may be separated, measured and managed separately.
Constructive and destructive wave interference in the polarization
domain may be used to advantage for study and for improved
communications over the entire LF-HF range in this manner.
The Quadripole dipoles are mounted on a PVC housing which
contains a very high impedance preamplifier connected to each of the
four monopoles and opposing pairs of outputs are collowed by a high
dynamic range broadband differential amplifier having fixed
gain. Each differential output then drives one pair of the CAT5
cable where it is conveyed to the receiver location, received in
hardware and possibly combined to synthesize polarization or provide
beam forming, noise rejection and whatever else may be useful.
This synthesis and combination may also be done more flexibly and
precisely using a dual-channel vector SDR and digital signal
processing.
Closer view of the Quadripole monopoles and preamplifier
Quadripole preamplifiers/amplifiers and power conditioning.
