Fabrication of Wideband Low-Profile Dielectric Patch Antennas from Temperature Stable 0.65 CaTiO3-0.35 LaAlO3 Microwave Dielectric Ceramic

In this paper, the medium dielectric constant 0.65CaTiO(3)-0.35LaAlO(3) (CTLA) composite microwave ceramic is employed to introduce in dielectric patch antennas (DPA). Typical, high-performance microwave dielectric properties of epsilon(r) approximate to 44.8, Q x f approximate to 43 950 GHz@3.67 GHz and TCF approximate to 0 ppm degrees C-1 can be obtained by solid-state reaction method in CTLA composite microwave ceramics sintered at 1450 degrees C for 2 h. Then, the CTLA composite ceramic patch fired with silver coating is mounted on the Rogers RO4003C substrate operating as a magnetic wall boundary. A simplified cavity-like theoretical model is used to analyze the proposed DPA structure and the accuracy of this antenna model is evaluated by the theoretical results from a commercial CST Microwave Studio 2019. Based on this, the CTLA composite ceramic physical property is modified to enhance the radiation efficiency and reduce profile of the DPA. The higher-order TM121 mode is brought close to the dominant TM101 mode by taking advantage of the multimode characteristics of the dielectric patch resonator and introducing a sintered silver slot in the ceramic dielectric patch. For demonstration, the proposed DPA prototype operating in the multiprobe antenna near the field measurement system is implemented and measured.