Abstract
This work presents the design, fabrication and microwave performance of coupled microstrip line phase shifter (CMPS) based on (Ba,Sr)TiO3 (BST) thin films for Ka-band phased array antenna. Ferroelectric BST thin films were deposited on MgO single crystal substrates by pulsed laser deposition. Because this CMPS design can bear the high dielectric constant of ferroelectric thin films at Ka-band, it has many advantages like the high tunability and the low loss. This design is proposed as a component in low-cost beam scanning phased array antennas. Though methods for calculating the characteristics of coupled line are well known, coupled line on the ferroelectric thin film is difficult to analyze because of the high dielectric constant and very thin thickness with respect to that of MgO substrate. So the coupled line on ferroelectric thin films was analyzed here simply using even and odd mode propagation concepts of coupled line by full-wave electromagnetic simulation. The measured results were in good agreement with the simulated results at the frequencies of interest. The measured differential phase shift based on BST thin films was 45° and the insertion loss decreased from −5.7 dB to −3.6 dB with increasing the bias voltage from 0 to 200 V at 30 GHz.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
