Ceramic laminated device and method for manufacturing same

Abstract

The present invention relates to a ceramic laminated device including a dielectric ceramic and an Ag electrode. In a dielectric ceramic that can be sintered at low temperatures and has a high dielectric constant and Q value, reactivity between the ceramic and Ag during sintering is suppressed low and segregation of specific elements in the proximity of the electrode is controlled. Thus, a filter having a high Q value and low loss is produced stably. For this purpose, in a ceramic laminated body including at least a ceramic and a Si-containing glass, a ratio of A / B, i.e. a ratio of a Si element concentration (A) within a range at a distance of 5 [mu]m or smaller from the Ag electrode to a Si element concentration (B) within a range at a distance larger than 5 [mu]m from the Ag electrode, is set equal to or smaller than 2.

Description

technical field [0001] The present invention relates to a ceramic laminated device and its manufacturing method. Background technique [0002] In recent years, with the development of communication technology using electromagnetic waves in the microwave region used in mobile phones, wireless local area networks (LANs), and the like, there has been an increasing demand for miniaturization of equipment. In order to realize miniaturization of these terminal devices, it is necessary to miniaturize high-frequency devices such as high-frequency filters and resonators constituting the devices. [0003] One of such high-frequency devices is a laminated dielectric filter. A laminated dielectric filter is formed by appropriately arranging internal electrodes (conductor metals) that form capacitors or striplines on the inner layer portion of a ceramic laminate made of dielectric ceramics, and utilizes the same resonant mode In the case of high-frequency components, the size of the hi...

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Problems solved by technology

[0006] However, in the above-mentioned conventional example, there is a problem that although sintering can be performed at a temperature of about 900° C. that can be sintered simultaneously with silver (Ag), when a ceramic laminated device is formed, the ceramic material is Reaction with silver (Ag) makes the electrode width or thickness smaller than the design value, and sufficient characteristics cannot be obtained

Furthermore, silicon (Si) or zinc (Zn), which is a component of glass or additives, or their composite oxides, etc., segregate as a secondary phase near the electrode, thereby reducing the Q value of the device and easily increasing the loss. The problem

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