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Design of Wideband Tunable Dispersive Delay using Cascaded All Pass Networks

Kumar, Ritesh and Keerthan, P and Vinoy, KJ (2015) Design of Wideband Tunable Dispersive Delay using Cascaded All Pass Networks. In: IEEE International Microwave and RF Conference, DEC 10-12, 2015, Hyderabad, INDIA, pp. 109-112.

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Official URL: http://dx.doi.org/10.1109/IMaRC.2015.7411430


In this paper, a tunable dispersive delay line using all pass network (APN) in UHF-Band has been designed using lumped elements. Two stages of second order APN has been cascaded, out of which one stage is fixed, where as the other stage is tuned for its group delay response. Tunability is achieved by replacing capacitors with varactor diodes. This approach gives a fractional bandwidth greater than 30% along with a tunable negative group delay slope of 8 - 3] ns/GHz over the frequency range of 650 - 850] MHz. The input and output matching is better than 10 dB and insertion loss less than 1.8 dB. Time domain measurements are carried out to validate the tunability in pulse stretching and compression. Such networks can be used for group delay engineering based applications such as frequency discriminators, spectrum sensing and reflection as well as transmission type group delay based RFID tags.

Item Type: Conference Proceedings
Series.: IEEE MTT-S International Microwave and RF Conference
Additional Information: Copy right of this article belongs to the IEEE
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 08 Oct 2016 06:52
Last Modified: 08 Oct 2016 06:52
URI: http://eprints.iisc.ac.in/id/eprint/54778

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