1. Navarro, J.A., and Chang, K.: ‘Integrated active antennas and spatial power combining’, (John Wiley & Sons, Inc., New York 1996)
2. Mortazawi, A., Itoh, T., and Harvey, J.: ‘Active antennas and quasi-optical arrays’, (IEEE Press, Piscataway 1999)
3. A 120-W X-band spatially combined solid-state amplifier
4. Millimeter-wave diode-grid phase shifters