Limitations of the Uda Model for T-Match Antennas

The T-match feed is a useful impedance matching tool for dipole antennas, especially for electrically short dipoles with capacitive loads.The Uda model has been extensively tested for accuracy in the literature for the special case of the folded dipole, but not for the more general T-match dipole, which is often used for RFID antenna design.We investigate the accuracy of the Uda model for this more general case and show that aspects of the model become inaccurate for a number of practical scenarios.Nevertheless, we show that the model can still be used as a guide to T-match dipole designs.