Abstract
This paper proposes the loop antenna for the system of blind area service in current cellular phone system. In general, one wave-length loop antenna is a mismatch to the coaxial cable. Then, a ring parasitic loop antenna is developed. The parasitic ring is effective though matches the loop antenna to the coaxial cable. In addition, the triple-band antenna that arranged ring parasitic loop antennas in the concentric circular is developed and its characteristics of return loss and radiation patterns are indicated.
