A low-loss dielectric using CaTiO₃-modified Mg_1.8Ti_1.1O₄ ceramics for applications in dielectric resonator antenna

Abstract

The microwave dielectric properties of (1-x)Mg 1.8 Ti 1.1 O 4 -xCaTiO 3 ceramics prepared by the mixed oxide route have been investigated. Spinel-structured Mg 1.8 Ti 1.1 O 4 , ilmenite-structured MgTiO 3 and perovskite-structured CaTiO 3 were coexisted and the three-phases system was confined by X-ray diffraction patterns, EDX analysis and it also leads to near-zero τ f . The microstructures of the ceramics were characterized by SEM. The microwave dielectric properties of the ceramics can be effectively controlled by varying the x value. For practical applications, a fine combination of microwave dielectric properties (ε r~ 19.61, Qf~ 72,700 GHz at 9.03 GHz, τ f ~ -3.7 ppm/°C) was achieved for 0.91Mg 1.8 Ti 1.1 O 4 -0.09CaTiO 3 ceramics sintered at 1330 °C for 4 h, which makes it is a very promising candidate material for applications in dielectric resonator antenna. A new triple-band dielectric resonator antenna fed by a coplanar waveguide is presented. The proposed antenna, composed of a high permittivity dielectric resonator and printed on FR4 substrate, is fed by a 50 Ω coplanar waveguide transmission line. In order to achieve wideband applications, the antenna with two parasitic inverted-L strip is demonstrated to generate two resonant frequencies covering 3.5 and 5.2 GHz. The measured results show that the antenna covers the frequency bands 2.30-2.72, 3.45-3.61, and 5.05-6.23 GHz with less than -10 dB of S 11 . The frequency response of the simulation results shows good agreement with the measured data. Good antenna gain, radiation efficiency and radiation patterns of the proposed antenna have also been observed across the operation band. Details of the proposed antenna design and experimental results are presented and discussed.

Dielectric resonator antenna with Y3Al5O12 transparent dielectric ceramics for 5G millimeter‐wave applications

“…At the same time, the simulated radiation efficiency in the entire frequency band exceeds 92.1%. The efficiency is slightly higher than that of conventional DRA 33,34 …”

Design of Tri-Band Hybrid Dielectric Resonator Antenna for Wireless Applications

“…Table 2 illustrates the comparison of the designed DRA with various established DRA models based on impedance bandwidth, and it depicts that the implemented DRA has a wide impedance bandwidth compared to the established antenna structures [31][32][33][34].…”

Terahertz antenna design for wearable applications

“…graphene, and carbon nano-tubes have shown promise in this regard [34]. Perovskites, due to the features such as superconductivity, ferro-electricity and low cost, have gained focus in various novel applications [35].The proposed antenna design is numerically analysed using CST Microwave Studio at room temperature (293 K). Perovskite material is simulated using the measured permittivity values as described in [19].…”