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可调带通滤波器被广泛应用于移动通信等微波系统中。本文提出了一种基于耦合微带线的变容二极管可调带通滤波器设计。首先讨论了基于耦合微带线双模可调带通滤波器的基本原理,然后据此设计了一个通过调节变容二极管反向偏置电压从而实现在1.9GHz到2.7GHz范围内可调,3dB带宽在此频率调节范围内几乎恒定(约为93MHz)的带通滤波器。并对此滤波器进行了仿真设计,最后通过在印刷电路板上实际加工并实验验证了此带通可调滤波器的性能。实验表明此带通滤波器结构简单,容易实现且成本低廉,在某些方面显示出一定的优越性。
Adjustable band-pass filter is widely used in mobile communications and other microwave systems. In this paper, a varactor tunable band-pass filter based on coupled microstrip lines is proposed. First of all, we discuss the basic principle of the dual-mode tunable band-pass filter based on the coupled microstrip line. Then, we design a circuit that can be adjusted in the range of 1.9GHz to 2.7GHz by adjusting the varactor diode reverse bias voltage, 3dB The bandwidth is almost constant (about 93MHz) bandpass filter in this frequency adjustment range. Finally, the performance of the band-pass tunable filter was verified through the actual processing and experiment on the printed circuit board. Experiments show that the band-pass filter has the advantages of simple structure, easy implementation and low cost, and shows certain advantages in some aspects.