Microwave Negative Group Delay Circuit: Filter Synthesis 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.

Broadband Microwave Negative Group Delay Transmission Line Phase Shifters

A Geometric Approach to Group Delay Network Synthesis

All-pass networks with prescribed group delay are used for analog signal processing and equalization of transmission channels. The state-of-the-art methods for synthesizing quasi-arbitrary group delay functions using all-pass elements lack a theoretical synthesis procedure that guarantees minimum-order networks. We present an analytically-based solution to this problem that produces an all-pass...

Modified Equivalent Circuit Model of Microwave Filter with LTCC Technique

Because microwave products in the consumer electronics market are continuous developing, device and component manufacturers have to seek new advanced integration, packaging and interconnection technologies, as size, cost and performance are critical factors for the success of a microwave product. One of the most promising integration technologies is the multilayer low temperature co-fired ceram...