Abstract
Free electrons in the ionosphere lead to significant group delay dispersion for signals in the megahertz and low gigahertz range. A novel microwave filter is presented that is capable of compensating for the non-linear ionospheric dispersion over a 600 MHz bandwidth between 1.2-1.8 GHz. The design method is general and is not limited to this particular frequency range but can provide an arbitrary phase and amplitude response over any frequency range. Several of the filters were constructed and used in an experiment to detect short radio pulse emission from the lunar regolith.
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