1. Liberti, J.L., and Rappaport, T.S.: ‘Smart antennas for wireless communication’, (Prentice-Hall 1999)
2. Koul, S.K., and Bhat, B.: ‘Microwave and millimeter wave phase shifters’, (Artech House 1992),2,
3. Ellinger, F.: ‘Radio frequency integrated circuits and technologies’, (Springer, Berlin 2007)
4. Ellinger, F.: ‘Monolithic integrated circuits for smart antenna receivers at C-band’, (Hartung-Gorre 2001)
5. An MMIC active phase shifter using a variable resonant circuit [and MESFETs]