| 摘要 |
A non-mechanical electrically adjustable delay device which does not suffer from interruptions in impedance inherent in multiple-tap delay lines. The wide band electrical delay line is capable of delaying a wide band of signals without significant distortion, e.g., up into the microwave range, and allows continuous transmission of a signal between the input port and the output port. The exemplary wide band electrical delay line comprises two transmission lines, preferably parallel to one another, and having different propagation velocities. A plurality of electrical cross connect circuits are connected between the two transmission lines. The electrical cross connect circuits are spaced along the lengths of the two transmission lines, e.g., preferably to form evenly spaced distances therebetween. The total delay through the wide band electrical delay line is adjusted by selectively activating an appropriate one of the plurality of cross connect circuits between the two transmission lines. The wide band electrical delay line may include an equalizer circuit connected either to an output end of the output transmission line or to an input end of the input transmission line. The equalizer circuit preferably compensates for both any loss and/or distortion associated with the presence of all of the electrical cross connect circuits.
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