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A 243 GHz LNA Module Based on mHEMT MMICs With Integrated Waveguide Transitions

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12 Author(s)
Hurm, V. ; Fraunhofer Inst. for Appl. Solid State Phys. (IAF), Freiburg, Germany ; Weber, R. ; Tessmann, A. ; Massler, H.
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For use in a millimeter-wave direct detection radiometer for earth remote sensing, we have developed a low-noise amplifier (LNA) module with a small-signal gain of 19.5 dB at 243 GHz and a 3 dB bandwidth of 40 GHz. The implemented three-stage LNA MMIC has been manufactured using a 50 nm gate length metamorphic HEMT (mHEMT) technology on 50 μm thick GaAs substrates. Each of the two on-chip integrated E-plane probe waveguide transitions offers a transmission loss of only 0.5 dB at 243 GHz including a 7.5 mm long WR-3.4 waveguide. Due to the low-loss packaging, the LNA module achieves a low noise figure of only 6.0 dB at room temperature.

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Microwave and Wireless Components Letters, IEEE  (Volume:23 ,  Issue: 9 )