i need some papers (ieee or others)on Microstrip fix antennas with U type slot/s and probably the fully- or partially- edge shorted compact versions of u-slotted patchs.
i have to work out some really compact and wideband/multiband base station antennas for GSM/DCS/PCS applications by this week for my project and i think u-slotted fix antennas with shorting walls are very good candidates to achieve my goals.
U can refer to Electronic letters u will get plenty of papers there on U-slot type antennas for ur applications
One book is also there Compact and Broadband antennas by Artech House