Akademik Veri Yönetim Sistemi
Przeglad Elektrotechniczny, cilt.98, sa.10, ss.86-89, 2022 (ESCI)
There are several methods of creating a Passive Millimeter Wave Imaging System (PMMWIS). One of these methods is to use tripod, 2-axis positioner, control unit, the parabolic reflector antenna (PRA) and the radiometric receiver located at the focal point of the PRA. The radiometric receiver, which is the most important part of the system can be divided into parts such as low noise amplifier (LNA), detector, mixer and video amplifier (VA). In this study; LNA will be explained. PMMWIS is an imaging method that emerged as a result of the weakening of the radiation in other systems due to atmospheric effects. In case of working in certain frequency windows (35 GHz, 96 GHz, 220 GHz, …); the radiation will not be affected by weather events and can be measured. In this study, an LNA has been created for a radiometric receiver that can be operated at Ka-band. Hittite brand HMC1040LP3CE chip from Analog Devices Company, which can theoretically give 23 dB gain in Ka-band has been preferred. The discrete elements and the chip in the circuit are very precisely placed on the board with special solder mixtures using electronic magnifiers, and 2.92 mm connectors are included in the input and output (IO) of the RF line of the circuit. In the last case; the LNA circuit, which was prepared for measurement, was fed with the power supply. It was measured with the help of vector network analyzer (VNA). At last, the LNA working in the Ka-band produced for PMMWIS with a gain value of 19.32 dB at 26.2 GHz center frequency was obtained.