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| 2. |
- Vorobyov, A., et al.
(författare)
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Iris-based 2-bit waveguide phase shifters and transmit-array for automotive radar applications
- 2012
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Ingår i: Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. - : IEEE. - 9781457709180 ; , s. 3711-3715
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Konferensbidrag (refereegranskat)abstract
- Three-pole iris-based bandpass filters are proposed as waveguide phase shifters for automotive applications at 77 GHz. Compared to standard configurations with symmetrical irises, asymmetrical designs have been preferred here in order to minimize technological constraints in the perspective of designing beam steering transmit-array antennas. Here the irises are printed on thin Silicon substrates integrated into a WR-12 metallic waveguide. A 210-element transmit-array antenna is also designed at 77GHz using, as building blocks, four different kinds of phase shifters providing a nearly 2-bit phase quantization in the radiation aperture. The phase shifter design are validated in X-band, and a very good agreement between simulations and measurements has been obtained both in amplitude and phase.
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| 3. |
- Vorobyov, Alexander, et al.
(författare)
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MEMS-based Reconfigurable Transmit-Array Antenna for 77-GHz Automotive Radar Applications
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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