All-Pass Negative Group Delay Function With Transmission Line Feedback Topology

Broadband Microwave Negative Group Delay Transmission Line Phase Shifters

Synthesis of Arbitrary Group Delay Responses with All-Pass Optical Cavities Structures

We propose a systematic method for the synthesis of arbitrary group delay responses by using allpass structures of coupled optical cavities. Optimum structure parameters design, in terms of filter order and accuracy, are obtained. OCIS codes: 140.4780, 060.4510, 230.1150, 350.4600

PAPER: Group Delay of Digital All-Pass-Filters and Phase-Correction Filter Design

(1. Audio Engineering, Communication University of China, Beijing 100024, China) (2. Information Engineering School, Communication University of China, Beijing 100024, China) Abstract: To correct phase distortion when filtering in the full band within the transient band, a method to design phase correction filters is proposed based on the studies on mathematical properties of IIR all-pass filte...

All-fiber tunable optical delay line.

We present a tunable optical delay line based on the use of a single chirped fiber Bragg grating written into a standard single mode optical fiber. In the proposed scheme, the delay is induced through the Bragg grating differential group delay curve. This is achieved by launching orthogonally polarized optical pulses in both directions into the Bragg grating and by controlling its local birefri...

Low Correlation Mimo Antennas with Negative Group Delay

Abstract—A key feature of upcoming 4G wireless communication systems is multiple-input-multiple-output (MIMO) technology. To make the best use of MIMO, the antenna correlation between adjacent antennas should be low (< 0.5). In this context, we propose a correlation reduction technique suitable for closely spaced antennas (distance, d < λ/40). This technique reduces mutual coupling between ante...