Antenna-feeder systems for EHF-radiointerferometers

Background. The development of a microwave method for researching shock-wave and detonation processes using radio interferometers requires the development of antenna-feeder systems taking into account the specifics of gas-dynamic experiments. Aim. Design of antenna-feeder systems for radio interferometers in the millimeter and submillimeter wavelength ranges, development of options for constructing feeder lines and probing devices. Methods. Theresultsof numericalmodeling in CST MWS, theoretical calculations and experimental studies of interferometer antenna-feeder systems are presented, confirming the proposed technical solutions effectiveness. Results. The requirements for antenna-feeder systems as an integral part of the radiointerferometer are given. Dielectric emitters advantages are justified and planar dielectric emitters are proposed. Small-sized antenna-feeder systems with dielectric inserts are proposed, which have found their application in diagnostic tasks in closed volumes. In order to reduce losses in the feed line and build lines up to several meters, antenna-feeder systems on rectangular supersized metal waveguides have been studied, including the proposed pyramidal horn transitions from standart waveguide section to a supersized section, and a combined feeder line using a flexible dielectric waveguide to connect metal waveguides. A quasi-optical two-mirror antenna with high spatial resolution and minimal losses is considered. Conclusion. The article shows the microwave diagnostic method advantages, various methods and schemes for feeder lines constructing proposed and justifies probing devices (emitters) types usage depending on the solved problem and the operating frequency range.