應用於2.4GHz之新型微型化高頻抑制共平面波導帶通濾波器

Abstract

For a circuit designer, when designing bandpass filters, there are many considerations regarding to the different requirements of the circuits The distributed circuit has better performance, but its size is too large when at the low frequencies. For integrated circuits the size of the circuits is an important issue due to the cost. Therefore, to diminish the size of the circuits has become a trend in the market. This thesis focuses on the design of the bandpass with reduced size of the circuits without being lowering the performance of the circuits. In this study, we used a concept of frequency combiner, and proposed a 2.4GHz band-pass filter and 3.1GHz band-reject filter both with high Q factor. We combined 2.4GHz band-pass filter and 3.1GHz band-reject filter to get a novel compact size 2.4GHz coplanar waveguide band-pass filter with harmonic suppression. It improved defects of the band-pass filter design based on the equivalent circuits with λ/4 and λ/2.