Dielectric properties of a new ceramic system (1−x)Mg4Nb2O9–xCaTiO3 at microwave frequency

High-dielectric-constant and low-loss microwave dielectric in the (1−x)La(Mg0.5Ti0.5)O3–x(Ca0.8Sr0.2)TiO3 solid solution system

“…x value Apparent density (g/cm 3 ) Notice that the ceramic system shows a good temperature stability ( f = − 4.7 ppm/ • C) at x = 0.5 indicating a suitable composition for practical applications. Fig.…”

“…The development of a microwave dielectric resonator for applications in communication systems such as cellular phones, wireless location networks (WLAN), direct broadcasting satellites (DBS) and global positioning systems (GPS) has progressed rapidly in the past decade [1][2][3][4]. These dielectric resonators must satisfy three main criteria: a high dielectric constant for miniaturization, a low dielectric loss (Q > 5000, where Q = 1/tan ı) for better selectivity and a near-zero temperature coefficient of resonant frequency ( f ) for stable frequency stability [5,6].…”

A new low-loss dielectric using CaTiO3-modified (Mg0.95Mn0.05)TiO3 ceramics for microwave applications

“…perovskite [8], respectively. The XRD patterns of the 93MMCT ceramic system did not change markedly with sintering temperatures in the range of 1180-1300 • C. Moreover, XRD patterns of the (1 − x)(Mg 0.95 Mn 0.05 )TiO 3 -xCaTiO 3 ceramic system are shown in Fig.…”

“…At the same time, in order to work with high efficiency and stability, many researches have been focusing on developing new dielectric materials with a high quality factor (Q × f) and a near-zero temperature coefficient of resonant frequency ( f ) for used of dielectric resonator and microwave device substrate [5][6][7]. For instance, low-loss dielectrics with different dielectric constants have become the most popular materials used for today's GPS patch antennas [8].…”

Dielectric properties and mixture behavior of Mg4Nb2O9–SrTiO3 ceramic system at microwave frequency

“…SrTiO 3 and CaTiO 3 have been individually employed as an effective f compensator to materials having positive f , such as MgTiO 3 and Nd(Zn 1/2 Ti 1/2 ) [5,[16][17][18]. In our previous report, 0.5Mg 4 Nb 2 O 9 -0.5CaTiO 3 possessed a fine combination of dielectric properties (ε r ∼ 24.8, Q × f value ∼82,000 GHz, and f ∼ −0.3 ppm/ • C) [19]. Still, a higher Q × f is craved for high frequency applications.…”