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Sökning: LAR1:lu > Sjöberg Daniel > Lunds universitet > Wernersson Lars Erik

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1.
  • Ohlsson, Lars, et al. (författare)
  • Admittance Matching of 60 GHz Rectangular Dielectric Resonator Antennas for Integrated Impulse Radio
  • 2010
  • Konferensbidrag (refereegranskat)abstract
    • Methods to achieve admittance matching of rectangular dielectric resonator antennas intended for 60~GHz impulse radio are reported. The motivation is to find a suitable antenna that may be integrated in the V-band gated tunnel diode wavelet generator, replacing its tank circuit and forming a low complexity transmitter. Probed one- and two-port scattering parameter measurements have been performed to characterise the fabricated antennas. Changing the feed structure from a tapered dipole to an offset fed and tapered slot, a change from capacitive to inductive characteristics is observed, and the matching to the gated tunnel diode is improved. Deembedded admittance resonance frequencies of fabricated antennas were found at 53.6 and 52.2~GHz for dipole and slot fed antennas, respectively. Characterising the transmission link between dipole fed antennas, a maximum antenna gain of 10.5~dBi and a 3~dB power bandwidth of 1.5~GHz were found at 53.3~GHz.
2.
  • Ohlsson, Lars, et al. (författare)
  • Monolithically-Integrated Millimetre-Wave Wavelet Transmitter With On-Chip Antenna
  • 2014
  • Ingår i: IEEE Microwave and Wireless Components Letters. - IEEE. - 1531-1309. ; 24:9, s. 625-627
  • Tidskriftsartikel (refereegranskat)abstract
    • An integrated millimeter-wave wavelet transmitter has been fabricated and characterized. It consists of a generator core on a co-designed compact monolithically-integrated antenna. The peak output equivalent isotropic radiated power has been measured to 11 dBm, in 80, 160, and 320 ps wavelets centred at 63.5 GHz. This corresponds to a power of 5 dBm radiated from the 6 dBi antenna. At a dc-supply of 1.45 V, the on-state power dissipation was estimated to 37 mW. The radiated wavelet-power over dc-dissipation conversion-efficiency is 9%.
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3.
  • Ohlsson, Lars, et al. (författare)
  • Slot-Coupled Millimeter-Wave Dielectric Resonator Antenna for High-Efficiency Monolithic Integration
  • 2013
  • Ingår i: IEEE Transactions on Antennas and Propagation. - IEEE. - 0018-926X. ; 61:4, s. 1599-1607
  • Tidskriftsartikel (refereegranskat)abstract
    • A readily mass-producible, flip-chip assembled, and slot-coupled III-V compound semiconductor dielectric resonator antenna operating in the millimeter-wave spectrum has been fabricated and characterized. The antenna has a 6.1% relative bandwidth, deduced from its 10 dB return loss over 58.8-62.5 GHz, located around the resonance at 60.5 GHz. Gating in the delay-domain alleviated the analysis of the complex response from the measured structure. The radiation efficiency is better than -0.1 dB in simulations fed from the on-chip coupling-structure, but reduced by 3.7 dB insertion loss through the measurement assembly feed. Antenna gain measurements show distortion in relation to the simulated pattern, which has a maximum gain of 6 dBi, mainly caused by interference from the electrically large connector used in the assembly. Mode degeneration in the utilized quadratic-footprint resonator was not seen to influence the performance of the antenna. The antenna is intended for on-chip integration and the fabrication technology allows scaling of the operation frequency over the complete millimeter-wave spectrum.
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