The normal mode helical antenna (NMHA) is widely selected on RFID and wireless communication applications and often placed in a dielectric material for protection and miniaurization design. In this paper, the effects of dielectric materials with finite dimension on resonant frequency and impedance characteristics of embedded small NMHA were investigated. Three parameters related to the dielectric material were considered. Significant results were obtained by varying each one of these electrical dielectric parameters. It provides an effective guidance for designers to tune the antenna to desirable complex impedance when surroundded dielectric materials are employed.

The electromagnetic properties of the material have been paid much attention as time goes by. The electronic large-scale material simulation is always a big problem. Parallel processing simulation codes is a good choice and a new method is proposed to simulate only one quarter of the structure and finally a small structure patch antenna with wide material is introduced to validate the method.