国外大学ADS设计微波滤波器以及样品

microwave_filter
1.0 Introduction to Filter
A filter is a network that provides perfect transmission for all
frequencies in certain passband region and infinite attenuation in the
stopband regions. Such ideal characteristics cannot be obtained, and the
goal of filter design is to approximate the ideal requirements to within an
acceptable tolerance. Filters are used in all frequency ranges and are
categorized into three main groups:
• Low-pass filters that transmit all signals between zero frequency and
some upper limit (c and attenuate all frequencies above (c.
• High-pass filters that pass all frequencies above the cutoff value (c and
reject all frequencies below (c.
• Band-pass filters that passes all frequencies in a range (1 to (2 and
reject frequencies