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High power microwave (HPM) sources are typically bulky and massive in order to be able to radiate the extremely high source powers with a good impedance match and low losses. For this reason, it is sometimes difficult to incorporate an HPM antenna onto a desired platform when the available space is small. In previous work, we have adapted an electrically small EZ antenna to operate with a mesoband,...
We compare the THz pulses generated by photoconductive antennas made from two different materials: ErAs:GaAs and Br-irradiated InGaAs. The THz pulses were generated using the same 1550 nm THz time-domain spectroscopy set-up. The detection was realized with an electro-optic crystal, allowing a direct comparison of the performance from the different antennas.
We report terahertz time-domain spectroscopy system based on Er:fiber laser at 1.55 μm wavelength. Ion-irradiated In0.53Ga0.47As photoconductive antenna is used as emitter. The detection is based on a phase modulation detection scheme in DAST electro-optic sensor.
We report the transfer of a GHz modulation from an optical carrier at telecom wavelengths to a free space THz beam. THz radiation-tunable from 300 GHz to 1.2 THz- is generated by mixing two telecom lasers with an offset frequency in an ultrafast In0.53Ga0.47As photoconductive device coupled to a broadband antenna. A maximum modulation rate of 20 GHz has been achieved, and the bandwidth is independent...
SMOS is the acronym of dasiaSoil Moisture and Ocean Salinitypsila and it refers to a European Space Agency (ESA) mission aimed at providing global maps of soil moisture over land and sea surface salinity over oceans. The mission has a single payload, the Microwave Imaging Radiometer with Aperture Synthesis (MIRAS), which is an L-band radiometer using an interferometric technique to synthesize high...
The microwave imaging radiometer using aperture synthesis (MIRAS) (M. Martin-Neira et al., November 1997) is the single payload of the SMOS (soil moisture and ocean salinity) mission by the European Space Agency (ESA). MIRAS performance was successfully tested during spring 2007 by the prime contractor, EADS-CASA Espacio Spain, at ESA premises in ESTEC, The Netherlands. The payload is currently in...
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