Maximally Flat Negative Group-Delay Circuit: A Microwave Transversal Filter Approach

A Miniaturized Self-Matched Negative Group Delay Microwave Circuit

A miniaturized self-matched negative group delay (NGD) microwave circuit without the need for external matching networks is proposed. The NGD circuit is based on a modified parallel-type RLC resonator, in which lumped elements (capacitors and inductors) are implemented by microstrip gaps and high-impedance and short-circuited microstrip lines. To verify the design concept, an NGD circuit with t...

Negative Group Delay and Superluminal Propagation: An Electronic Circuit Approach

We present a simple electronic circuit which provides negative group delays for band-limited, base-band pulses. It is shown that large time advancement comparable to the pulse width can be achieved with appropriate cascading of negative-delay circuits but eventually the out-of-band gain limits the number of cascading. The relations to superluminality and causality are also discussed.

Design of maximally flat IIR filters with flat group delay responses

Digital filters with linear phase responses, that is, constant group delay responses are needed in many applications for signal and image processing. In this paper, a novel method is proposed for designing maximally flat IIR filters with flat group delay responses in the passband. First, a system of linear equations are derived from the flatness conditions of IIR filters given in the passband a...

Broadband Microwave Negative Group Delay Transmission Line Phase Shifters

A matrix approach for the coefficients of maximally flat FIR filter transfer functions

A matrix approach is proposed for determining the coefficients of maximally flat (m.f.) FIR filter transfer functions expressed in terms of cosine of multiple angles. In this, a transformation matrix maps a functional vector, the entries of which are either 0 or 1, into the coefficient vector of the m.f. filter transfer function. It is shown that the transformation matrix could be generated eit...