小型化高性能带状线型滤波器的研究

A Research of Bandpass Filter with Miniaturization and High Performance Based on Stripline Configuration

摘要: 随着科技的不断进步，现代通信技术对设备的要求愈来愈高，对于微波滤波器这一重要的射频元器件在小型化与高性能方面的要求也越来越严格。而基于LTCC技术的带状线型微波滤波器正好满足了这些需求，逐渐成为了微波元器件研究的热点之一。本文实现了一种基于LTCC技术的小型化高性能带状线滤波器设计的实现方法，工艺上采取的LTCC技术大大缩小了滤波器的尺寸。借助电路仿真并在电磁场三维仿真软件上进行优化，实物测试结果与仿真结果很好的吻合，中心频率为2800 MHz，带宽为200 MHz，在2600 MHz频率上的衰减优于33 dB，在3020 MHz频率上的衰减优于25 dB，尺寸仅为4.8 mm × 4.2 mm × 1.5 mm。

Abstract: With the continuous progress of technology, modern communication technology has increasingly demand for high-level equipment; the situation of the microwave filter as one of the essential components in microwave module is the same case. Multilayer microwave filter which is based on the LTCC technology meets these requirements and is becoming one of the hot research fields. A method for the section of stripline configuration bandpass filter with miniaturization and high performance is proposed. In order to ensure its miniaturization, this filter is based on the LTCC technology which is advance in the world. Using the circuit simulation and 3D simulation software to optimize and simulate, the measured results of the filter satisfy its performance requirement. The centre frequency of the BPF is at 2800 MHz and its bandwidth is 200 MHz; at 2600 MHz the stop-band attenuation needs to be more than 33 dB and at 3020 MHz is more than 20 dB. Its size of the fabricated filter is only 4.8 mm × 4.2 mm × 1.5 mm.