Current Research Projects:
Millimeter-Wave Front-End Electronics

Figure 1: The monopulse concept based on IF processing.

Figure 2: The monopulse receiver topology on a dielectric lens with four slot-ring antennas and four subharmonic mixers.

Figure 3: A dual-polarized (polarimetric) monopulse reveiver topology on a dielectric lens.

Figure 4: Picture of the fabricated monopulse receiver chip.

Figure 5: Detail of the 2 x 2 slot-ring antenna design fed by cpw lines.

Figure 6: Detail of the W-band cpw subharmonic mixer.

Figure 7: The GaAs back-to-back diode used from UVa. The diode is 200 µm long x 80 µm wide.

Figure 8: Fabricated 94 GHz Monopulse Receiver on a dielectric lens (front and back view).

Figure 9: A novel wideband monopulse comparator integrated on a silicon chip.

Fig. 10: Measured sum patterns at 94 GHz. The measurements were done at the IF sum port at 3 GHz.

Fig. 11: Measured sum and differnce elevation patterns at 94 GHz. The measurements were done at the IF sum and difference ports at 3 GHz. The null was maintained lower than 25 dB over a 2 GHz bandwidth (2-4 GHz).