Composite microwave tuning strontium barium titanate ceramics

Abstract

The composite microwave tuning strontium barium titanate ceramics consists of strontium barium titanate and low dielectric loss material. The low dielectric loss material is preferably one with perovskite structure, such as LaAlO3, NdGaO3, La(Mg1/2Ti1/2)O3, La(Zn1/2Ti1/2)O3, etc. The said perovskite structure material and the strontium barium titanate have similar lattice constant and thus are easy to form solid solution, and have no harmful second phase created, no degradation in microwave dielectric loss and high tuning rate of strontium barium titanate. The material of the present invention may be used in phase shifter, adjustable filter, delay line, vibrator, resonator, phase-controlled array antenna and other microwave devices.

Description

technical field [0001] The invention belongs to the technology of functional ceramics, in particular to a microwave tuning barium strontium titanate composite ceramic. Background technique [0002] Microwave devices such as tunable filters, delay lines, phase shifters, oscillators, resonators and phased array antennas are important devices in the field of microwave communications, but their high cost limits their wide commercial application. Low-cost tuning technology will revolutionize the microwave components and antenna industry. [0003] The dielectric constant of microwave tuning materials can change with the applied voltage. Applied in the field of microwave communication, the operating frequency of the component can be changed by applying an external voltage, such as a filter that can produce frequency hopping, which is very important for future broadband communication, because it can enable several users to transmit and receive in a common frequency range Signal. ...

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Problems solved by technology

Babbit proposed in "Planar Microwave Electro-Optic Phase Shifters" MicrowaveJournal, V35(6), 1992 that strontium barium titanate can be applied to various antennas, but the microwave dielectric loss of strontium barium titanate is too high, and it is necessary to make a material make improvements

In addition, too large a dielectric constant will lead to too large insertion loss, which is difficult to match with the circuit

Using porous strontium barium titanate, its dielectric constant is reduced, and the microwave dielectric loss is reduced, but the process is complicated, the uniformity and repeatability are poor, and the dielectric constant of strontium barium titanate varies greatly at different frequencies

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