Compact, tunable large group delay line

Abstract

In this paper, we present a compact, tunable delay line based on left-handed nonlinear transmission line (LH NLTL). The widely tunable range of the large group delay is achieved by controlling a reverse bias voltage of series varactors in the LH NLTL. The proposed tunable delay line can be made in a very compact form because its size is dominated by the cascaded varactors. Our experiment shows that the fabricated prototype exhibits tunable group delay between 1.2 and 2.2 ns at a frequency of 1.42 GHz and good return loss. The circuit size is merely 1.6 cm in length.

A wideband time-delay line inspired by CRLH TL unit cell

“…(2) - (6) show that the structural parameters L R , C R , L L and C L determine β and hence the times delay of the unit cell through…”

“…CRLH TL can be used to design many different microwave components such as phase shifters, antennas and bandpass filters, etc. Recently, different design approaches of time-delay lines based on using the CRLH TL have been proposed and studied [3][4][5][6]. However, these designs share one of the major drawbacks, i.e., the bandwidth is relatively narrow.…”

UWB true‐time‐delay lines inspired by CRLH TL unit cells

“…CRLH TL can be used to design many different microwave components such as phase shifters, antennas and bandpass filters, etc. Recently, different design approaches of TTDLs using the CRLH TL have been proposed and studied [10][11][12][13]. However, these designs share one of the major drawbacks, i.e., being relatively narrowband.…”

A compact and UWB time-delay line inspired by CRLH TL unit cell

“…CRLH TL can be used to design many different microwave components such as phase shifters, antennas and bandpass filters, etc. Recently, timedelay lines based on using the CRLH TL have been proposed and studied [4][5][6][7]. However, these designs share one of the major drawbacks, i.e., the bandwidth is relatively narrow.…”