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An electronically controlled switchable delay line

An electronically controlled switchable analog delay line has been presented in the paper. The line works in 13-17 GHz frequency range and provides constant group delay due to using coaxial lines in each delay channel. Due to moderate size of the line segments, short or moderate time delay can be obtained by this approach only. Presented solution has simple construction, so it is easy to use, implementation and expand, depending on the needs. The construction of the circuit is based on the coaxial line sections, 3 dB power dividers and SP4T switch. To obtain equal transmission in each path, additional attenuators are used. Laboratory model of the delay line was build, selected parameters were measured and presented in the paper. Obtained results confirm non-dispersive characteristics, according to the assumptions made.