MEMS-based Reconfigurable Transmit-Array Antenna for 77-GHz Automotive Radar Applications
(English)Manuscript (preprint) (Other academic)
This paper presents an alternative solution for reconfigurable beam-steering front-ends consisting of a waveguide-based transmit-array antenna with MEMS-based waveguide-integrated phase shifters used as individual building blocks. The antenna array configuration is implemented with 210 phase shifters integrated in WR-12 rectangular waveguides (60-90 GHz, inner dimensions 3.099 mm × 1.55 mm) with operating frequency of 77 GHz. The phase shifters are based on tunable bilateral finline bandpass filter with microelectromechanical system (MEMS) switching elements integrated in the finline slot. The phase states are controlled by a suitable combination of open and closed states of the individual MEMS switches. The proof-of-concept prototype of the proposed antenna array has been fabricated and characterized. For this prototype, beam-steering capability of the transmit-array antenna is shown by shifting the horn antenna feed. The transmit-array array exhibits good performance up to 15° over the measured frequency band with HPBW of 4.5º-5.5º while the horn feed is shifted up to 12 mm from the initial central position.
RF MEMS, antenna array, automotive radar
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-143039OAI: oai:DiVA.org:kth-143039DiVA: diva2:705215
QS 20142014-03-142014-03-142014-03-17Bibliographically approved