Title :
Dual-band dual-polarized log-periodic feed for reflector antenna
Author :
Plastikov, Andrey N. ; Vasiliev, V.A. ; Chadov, S.E.
Author_Institution :
CJSC “KIA Syst.”, Moscow, Russia
Abstract :
A dual-band dual-polarized feed for a symmetrical single-reflector antenna is presented in this paper. Antenna system receives telemetry information in the meter (120-225 MHz) and decimeter (625-650 MHz) frequency bands. Reflector has a low F/D ratio 0.25. The feed consists of two log-periodic dipole array antennas (LPDAs) formed by metallic tubes. Calculated aperture efficiency values (without taking into account matching and cable losses and shadowing of the feed screen and support structures) are about 51% in decimeter band and within 34...44% in meter band. Feeding coaxial cable wave impedances are equal to 75 Ohm and 50 Ohm for meter and decimeter band feed, respectively. A 75-to-50 Ohm coaxial section with a pair of parallel open-circuited stubs is used to match meter band LPDA with 50 Ohm low-noise amplifier input impedance. Measured VSWRs are less than 2.2 in meter band and about 1.8 in decimeter band.
Keywords :
antenna feeds; dipole antenna arrays; low noise amplifiers; multifrequency antennas; reflector antennas; telemetry; LPDA; antenna system; cable losses; coaxial cable wave impedances; dual-band dual-polarized feed; dual-band dual-polarized log-periodic feed; feed screen shadowing; frequency 120 MHz to 225 MHz; frequency 625 MHz to 650 MHz; log-periodic dipole array antennas; low-noise amplifier; matching losses; metallic tubes; parallel open-circuited stubs; resistance 50 ohm; resistance 75 ohm; single-reflector antenna; telemetry information; Antenna feeds; Antenna radiation patterns; Dielectrics; Dipole antennas; Impedance; Reflector antennas; LPDA; dual-band antenna; log-periodic dipole array antenna; reflector antenna feed; ultra wideband antenna;
Conference_Titel :
Antenna Theory and Techniques (ICATT), 2013 IX International Conference on
Conference_Location :
Odessa
Print_ISBN :
978-1-4799-2896-5
DOI :
10.1109/ICATT.2013.6650810
