Microwave interferometer for phase and response time measurements

Autor:	Janusz H. Hankiewicz, Zbigniew Celinski, J. E. Nobles, D. Bueno Baques
Rok vydání:	2020
Předmět:	010302 applied physics Materials science business.industry Response time Ranging 01 natural sciences 010305 fluids & plasmas Interferometry Amplitude Optics Intermediate frequency 0103 physical sciences Device under test business Instrumentation Microwave Voltage
Zdroj:	Review of Scientific Instruments. 91:024707
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.5138591
Popis:	We report the development of a microwave interferometer using a quadrature intermediate frequency (IQ) mixer designed to measure the relative phase change and response time of microwave devices tested in the Ka and upper K bands (22–40 GHz). The interferometer is currently used to test liquid crystal based devices. The system allows for the application of an AC bias beyond the amplitude/frequency limitations imposed on vector network analyzer bias ports. Our IQ mixer based design uses bias signals ranging from 0 to 100 V peak-to-peak in a frequency range from DC to 100 kHz. This range of bias signals is necessary to properly test the response of microwave devices designed with liquid crystal materials. The setup enables us to measure changes in the output phase of the device as a function of both the voltage and frequency of the applied bias signal. The setup also measures the phase difference as a function of microwave frequency and response times for the device under test. Our system can be integrated into a stand-alone test setup without the need for a vector network analyzer.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57ab29292af74754c973f57650b755d9 https://doi.org/10.1063/1.5138591 Zobrazit plný text záznamu