The microwave dielectric properties and the microstructures of (Mg1−xZnx)2TiO4 ceramics prepared by the conventional solid‐state route were investigated. Lattice parameters were also measured for samples with different x. As x increased from 0 to 0.05, the Q×f of the specimen can be promoted from 150 000 GHz to a maximum 275 300 GHz. It also showed a remarkable lowering in the sintering temperature (∼100°C). Ilmenite‐structured (Mg0.95Zn0.05)TiO3 was detected as a second phase. The coexistence of the second phase, however, is not harmful to the dielectric properties of the specimen because it possesses compatible ones. A fine combination of microwave dielectric properties (ɛr∼15.48, Q×f∼275 300 GHz, τf∼−34 ppm/°C) was obtained for (Mg0.95Zn0.05)2TiO4 specimen sintered at 1330°C for 4 h. It is proposed as a very promising dielectric material for low‐loss microwave and millimeter wave applications.

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The miniaturization of end‐coupled microstrip slow‐wave resonator filters using two high‐permittivity ceramic substrates (with respective dielectric constants of 9.7 and 25.45) were investigated. The designed end‐coupled structures were simulated using an IE3D simulator. The responses of the fabricated filters using Al2O3 (εr = 9.7, tan δ = 0.000036) and newly developed 0.85MgTiO3‐0.15Ca0.6La0.8/3TiO3 (εr = 25.45, tan δ = 0.00002) ceramic substrates were designed to have a center frequency of 1.8 GHz. The proposed filter showed not only a tremendous reduction in the insertion loss but also demonstrates a marvelous cut in its size. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1613–1615, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24366