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Synthesis of broadband dispersive delay structures formed by commensurate C‐ and D‐sections

We propose an exact closed‐form synthesis method for the design of broadband dispersive delay structures (DDSs) formed by the series connection of commensurate all‐pass C‐ and D‐sections. In this method, the transfer function synthesis problem is converted into a Hurwitz polynomial generation problem, where the real roots correspond to C‐sections and the complex roots correspond to D‐sections. Several design examples are provided to illustrate the proposed synthesis method. A prototype is implemented in strip‐line configuration and fabricated in LTCC technology, and the measured response is in good agreement with the prescribed and full‐wave responses. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:322–331, 2014.