A Novel Compact Microstrip Antenna Embedded with Magneto-Dielectric Ferrite Materials For 433 MHz Band Applications

In this paper, a novel and compact microstrip patch antenna with relatively high gain is proposed for ISM 433 MHz applications. To realize the miniaturization of the antenna, patch and ground slots are employed in this paper firstly. For gain enhancement, this paper utilized folded metal sheets connected with the ground plane to suppress cross-polarization, and this method maintains the advantage of the low profile of microstrip antenna. Furthermore, a pair of novel magneto-dielectric ferrite bars which have high permittivity and permeability are embedded into the substrate to further reduce the dimension of the antenna and improve the antenna performance. In addition, the parametric studies on the effects of the permeability of the ferrite, size of the ferrite, biased magnetic field strength and height of the metal sheets are presented. The proposed antenna has a bandwidth of 2.1 MHz, gain of 1.3 dBi, and an omni-directional radiation pattern. The total size of the proposed antenna is 70 mm x 75 mm x 15 mm.