Title :
Edge feeding of microstrip ring antennas
Author :
Garg, Ramesh ; Reddy, V.S.
Author_Institution :
Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur, India
Abstract :
We have achieved 50 Ω input impedance for edge-fed narrow microstrip square-ring antennas by using the circumferential variation of current on the ring. The reference point for the current distribution has been fixed by loading the ring. The antenna has been modeled as a lossy transmission line to determine the variation of resonant frequency and input impedance with load. This model has been validated using the mixed potential integral equation approach. The agreement between the two approaches is found to be good. The concept and the model used here can be applied to any type of ring antenna including loop antennas.
Keywords :
antenna feeds; antenna radiation patterns; current distribution; electric impedance; integral equations; loop antennas; microstrip antennas; resonance; transmission line theory; 50 ohm; antenna radiation patterns; circumferential current variation; current distribution; edge-fed microstrip square-ring antennas; input impedance; loaded-ring microstrip antenna; loop antennas; lossy transmission line model; mixed potential integral equation; resonant frequency; Antenna feeds; Current distribution; Impedance; Integral equations; Load modeling; Loaded antennas; Microstrip antennas; Propagation losses; Resonant frequency; Transmission line antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2003.815423
