1. [1] H. Hommel and H. Feldle, “Current status of airborne active phased array (AESA) radar systems and future trends,” IEEE MTT-S Int. Microw. Symp. Dig., pp.1149-1452, June 2005.
2. [2] J.C. Rock, J.H. Mullines, J.P. Booth, and T. Hudson, “The past, present, and future of electronically steerable phased arrays in defense applications,” IEEE Aerospace Conf., pp.1-7, March 2008.
3. [3] C.F. Campbell and M. Poulton, “Compact highly integrated X-band power amplifier using commercially available discrete GaN FETs,” Proc. Asia-Pacific Microw. Conf., pp.243-246, Dec. 2011.
4. [4] K. Kanto, A. Satomi, Y. Asahi, Y. Kashiwabara, K. Matsushita, and K. Takagi, “An X-band 250W solid-state power amplifier using GaN power HEMTs,” IEEE Radio and Wireless Symp., pp.77-80, Jan. 2008.
5. [5] Y. Yamashita, T. Nakada, T. Kumamoto, R. Suzuki, and M. Tanabe, “X-band GaN HEMT advanced power amplifier unit for compact active phased array antennas,” ICCAS-SICE, pp.3047-3050, Aug. 2009.