| 1. |
- Ohlsson, Lars, et al.
(författare)
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Mixed-domain gating algorithm for time-domain characterisation of millimetre-wave antennas
- 2017
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Ingår i: European Microwave Week 2017 : "A Prime Year for a Prime Event", EuMW 2017 - Conference Proceedings; 47th European Microwave Conference, EuMC 2017 - "A Prime Year for a Prime Event", EuMW 2017 - Conference Proceedings; 47th European Microwave Conference, EuMC 2017. - 9782874870477 ; 2017-January, s. 256-259
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Konferensbidrag (refereegranskat)abstract
- A mixed-domain device characterisation algorithm with is proposed and evaluated. Wideband signals from a time-domain wavelet generator are applied to millimetre-wave antennas. Deliberately chosen gating techniques in time- A nd frequency-domain are used to relax the calibration effort to one reference measurement. A frequency-domain gate shapes the excitation pulse. Selective removal of setup artefacts and channel reflections is achieved by a time-domain gate. This method is applied to antenna links that demonstrate various gain, dispersion, and bandwidth combinations. The mixed-domain gating results on time-domain wavelets correspond well to those from frequency-domain vector network analysis. This promises simplified future millimetre-wave measurements systems based on methods used in terahertz spectroscopy.
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| 3. |
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| 4. |
- Vakili, Iman, et al.
(författare)
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Pulse transmission using leaky lens antenna and RTD-MOSFET wavelet generator
- 2013
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Ingår i: [Host publication title missing]. - 2164-3342. - 9781467321877 ; , s. 324-325
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Konferensbidrag (refereegranskat)abstract
- A leaky lens antenna system for short pulse applications is designed, fabricated and characterized. The antenna has very good phase center stability over large bandwidths. The leaky lens antenna is connected to an in-house wavelet generator to transmit 100 ps pulses centered at 57.5 GHz. It is shown that the antenna preserves the reference pulse shape and has very low dispersion.
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| 6. |
- Vakili, Iman, et al.
(författare)
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Time-Domain System for Millimeter-Wave Material Characterization
- 2015
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480. ; 63:9, s. 2915-2922
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Tidskriftsartikel (refereegranskat)abstract
- Time-domain material characterization using a leaky lens antenna and an in-house fabricated millimeter-wave wavelet generator using III-V technology is investigated. The wavelet generator produces short high-frequency pulses and is connected to a wideband and non-dispersive leaky lens antenna. A purely time-domain methodology is used to extract the complex permittivity of non-dispersive and non-magnetic materials. The permittivity is found from the phase delay and the amplitude mismatch introduced by the object at the carrier frequency of the pulse. The wide bandwidth of the wavelet is used to investigate frequency dependent material properties. Measurement results from two dielectric slabs are illustrated. The time-domain methodology is verified by frequency-domain measurements and analysis.
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| 7. |
- Vakili, Iman, et al.
(författare)
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Wideband and Non-Dispersive Wavelet Transmission using Leaky Lens Antenna
- 2013
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 49:5, s. 321-322
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Tidskriftsartikel (refereegranskat)abstract
- An ultra-wideband, non-dispersive leaky lens antenna system for impulse applications has been designed, fabricated and characterized. An in-house wavelet generator is connected to the antenna to transmit 100 ps-long square pulses with center frequencies at 45, 60 and 75 GHz. It is shown that the leaky lens antenna has negligible distortion and preserves the pulse shape generated by the millimeter-wave pulse generator.
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