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

Piezoelectric pumps possess many advantages such as quiet operation, quick response, simple structure, and nonelectromagnetic radiation. This paper presents a PZT (Lead zirconate titanate) liquid pump with low power, high flow rate, small size, and light weight. The liquid pump is composed of the piezoelectric ceramic, elastomer valve, and PET (Polyethylene terephthalate) pump body. The power consumption, flow rate, body size and weight of the pump are 1 W, 800 ± 5% ml min-1 , 50 × 50 × 10 mm., and 50 g, respectively. Additionly, the pump works at an exciting voltage of 50 Hz, 40 V. According to the applied voltage or frequency to a PZT pump, the flow rate of the fluid is able to be controled. Besides, the liquid pump is suitable for various fluids such as water, alcohol, soda, hydrochloric acid, etc.

The miniaturization of ring bandpass filters by employing high-permittivity ceramic substrates (with respective dielectric constants of 9.7 and 23.5) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. With the advantages of compact size, high-permittivity ceramics can be used as the substrate for bandpass filters. Moreover, the fundamental characteristics of newly developed compact square-ring resonators have also been described and applied to the design of bandpass filters. In this paper, the designed square-ring resonators structures are simulated using an IE3D simulator. The responses of the fabricated bandpass filters using Al 2 O 3 (e r ¼ 9.7, tan d ¼ 0.000036) and 0.875Mg 0.95 Zn 0.05 TiO 3 -0.125Ca 0.8 Sm 0.4/3 TiO 3 (e r ¼ 23.5, tan d ¼ 0.000021) ceramic substrates are designed at the center frequency of 2.4 GHz. This compact size, low loss bandpass filter should be useful in many wireless communication systems.