| 摘要 |
A new technique is presented that allows for controlling the phase of a propagating signal by selectively switching in and out relatively small perturbations along a transmission line section that provide slightly different physical paths for the currents to follow. By using relatively minor perturbations, the phase of a transmission line section can be controlled without drastically altering the impedance of the section, thereby maintaining good impedance matching properties. Also, by keeping the alternate current paths small, generally fine control of phase shift is possible along with allowing the design to remain relatively simple. Such tunable elements can then be incorporated in designs where resonators (or other elements) are separated by specific phase lengths to construct other signal processing functions, such as filters.
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