A Miniaturized Self-Matched Negative Group Delay Microwave Circuit

Abstract

Abstract-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 the size of 0.21λ g × 0.29λ g is designed and fabricated. From the measurement results, the NGD time of −5.9 ns at the center frequency of 1.532 GHz is obtained with insertion loss of less than 12.5 dB, return losses of more than 25 dB and NGD bandwidth of 45 MHz.

Quasi-Static and Tensile Behaviors of the Bamboos

“…Shao et al [46] performed tensile tests on the macroscopic bamboo blocks (4 years old) and the mesoscopic bamboo fiber and showed that the tensile strength of bamboo fiber obtained from the tests on bamboo blocks was higher than that on separated fiber bundles. Habibi and Lu [47] studied crack growth mode in the hierarchical cellular structure of the 5 years old mature Moso bamboo and revealed that fibers' pull out was one of the prominent feature in tensile fracture surface.…”