Develop CPW‐FED monopole broadband implantable antennas on the high dielectric constant ceramic substrates

A compact broadband planar monopole antenna fed by coplanar waveguide is developed and screen‐printed on the high dielectric constant microwave dielectric ceramic substrate for the applications of implanted biotelemetry. Biocompatible ceramic materials are selected for substrate (MgTa 1.5 Nb 0.5 O 6 , ε r = 28) and superstrate (Al 2 O 3 , ε r = 9.8). Additionally, for protecting from the tissue erosion, the metal parts (the body of the implanted antenna) are screen printed on a MgTa 1.5 Nb 0.5 O 6 ceramic substrate and covered by a Al 2 O 3 ceramic superstrate. Because the inductive loading effect generated by the rectangular type meander and the use of high dielectric constant ceramics, both size miniaturization and bandwidth enhancement can be achieved. The measured S 11 of the proposed antenna in lossy emulated tissue is −43 dB, and the bandwidth of this proposed antenna can be improved to 100 MHz (351–461 MHz), which it is wide enough for the applications of modern MICS band (402–405 MHz) and ISM band (433–435 MHz).