1. Broadband Patch antennas;kumar;Artech House Boston,2002
2. Spiral Slot Antenna;turner;U S Patent,1958
3. Compact, extended bandwidth 0.7 to 40 GHz spiral antenna with integrated diplexer;baker;Proc 8th SAIEEE AP/MTTS Symposium Stellenbosch South Africa,1994
4. Antenna Theory Analysis and Design;balanis;John Wiley & Sons Inc,2005
5. Millimeter-Wave Microstrip and Printed Circuit Antennas;bhartia;Artech House Boston,1991