PROJECT TITLE :

Double-Tuned Impedance Matching

ABSTRACT:

In the Nineteen Forties, Harold Wheeler developed the principles of double-tuned impedance matching during a simple type. These relationships are not well known. They're very useful for the antenna designer in providing a structured approach to obtain near-most bandwidth for narrowband and moderate-band antennas with a specified VSWR limit, using a sensible arrangement of tuning components. Wheeler 1st developed relationships for single-tuned impedance matching, that relate the fractional bandwidth to the antenna's Q and the utmost-permissible reflection-coefficient magnitude (or VSWR). He used the results of single-tuned impedance matching to derive the connection for double-tuned impedance matching. Wheeler's double-tuned impedance-matching relationship is the most effective overall measure of the achievable fractional bandwidth for an antenna. Double tuning is sensible, and provides a lot of than double the fractional bandwidth of single-tuned impedance matching. One example of double-tuned impedance matching is presented. A comparison to recently revealed results for single-tuned impedance matching verifies that double tuning a lot of than doubles the fractional bandwidth of single-tuned impedance matching.


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