Dielectrics (Zn,Mg)TiO3, having a high dielectric constant and a near zero temperature coefficient of resonant frequency are promising materials for microwave applications. In this work, Bi2O3 was added to (Zn,Mg)TiO3 as a low-temperature-sintering dopant. The addition of Bi2O3 significantly improved the densification of (Zn,Mg)TiO3, which were densified below 1000°C. In addition, the decomposition temperature of (Zn,Mg)TiO3 increased as the magnesium substitution increased. Microwave dielectric properties of (Zn,Mg)TiO3 ceramics depend on crystalline structure. By properly adjusting the amount of magnesium, a small temperature coefficient of resonant frequency was obtained for (Zn,Mg)TiO3 dielectrics.

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A four‐pole open‐loop resonator bandpass filter fabricated on high dielectric constant (Zn0.9Mg0.1)TiO3 ceramic substrates is presented. The full‐wave simulator IE3D is utilized to calculate the coupling coefficients of each basic coupling structure and simulate S‐parameters of the designed bandpass filters. The center frequency of designed bandpass filter is fo = 2.45 GHz and the fractional bandwidth is 4%. The center frequency of the fabricated bandpass filter is at 2.47 GHz and the fractional bandwidth is 5%. The measured insertion loss and return loss of the filter is −3.68 and −14.92 dB, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2087–2090, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22698

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