Improving the Bandwidth of Simple Matching Networks

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  • Author: Gary Breed
Impedance matching is probably the most engineering task in RF/microwave design. This tutorial is intended to demonstrate the first steps from simple two and three-element networks that are designed for a specific center frequency, to larger networks that provide an acceptable match over a wider bandwidth. These wider bandwidth networks are important for modern communications systems that have operating bandwidths that are much wider than older technologies using FM and BPSK modulation. Even at narrower bandwidths, many digital modulation formats require flat amplitude and linear phase response, which can be achieved by using wideband matching networks, which have much smaller variation over a signal’s occupied bandwidth.
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