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the idea of software only usb is not ridiculous at all.
try ....
V-USB - A Firmware-Only USB Driver for Atmel AVR Microcontrollers
i have used and implemented this as various interfaces CDC, HID, etc. and have found to be most rewarding and instructive .
however to answer vinod's original...
near field uhf microstrip antenna
the UHF Rfid tags couple with the interrogator Electrostatically rather than Electromagnetically
UHF Rfid tags will perform much better with a patch antenna rather than a loop antenna.
how far between passive tag and a reader
the LF and HF Rfid Tags use ElectroMagnetic coupling to communicat - the coil of the antenna and the Tags sort of form a transformer circuit
the UHF Rfid tags use the Electrostatic coupling to communicate. the antenna of the Tag form a capacitor with...
900 mhz rfid tag
it is not an omnidirectional antenna. generally the UHF RFID Tags have antennas which are tuned to 900MHZ and are polarized along te lenth of the TAG
Also if the antenna had zero gain, it would mean that the TAG chip would perform equally well without the antenna....
although...
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