Evolutionary Trends in True Time Delay Line Technologies for Timed Array Radars

Received: 14 Jan 2022, Revised: 16 Jan 2022, Accepted: 25 Mar 2022, Available online: 29 Mar 2022, Version of Record: 29 Mar 2022

Kuruva Sreenivasulu; Dr K P Ray; Dr. VENGDARAJAN

Abstract



Timed array technology is rapidly evolving in multiple areas such as high resolution imaging radar, automotive, medical, high data rate communication applications etc. Timed arrays by utilising True Time Delay (TTD) lines in place of phase shifters mitigate beam squint and pulse dispersion issues associated with wide instantaneous bandwidth arrays. This paper presents on review of evolutionary trends in TTD line architectures starting from coaxial cable to photonic integrated circuit. The paper also reports on critical parameters of TTD lines, their importance and implication in design of typical X-band imaging radar. Comparison of different TTD line architectures in terms of configuration, implementation, merits and demerits are discussed in detail for wideband array application. The paper also brings out the integration aspects of TTD lines as part of T/R modules and proposes suitable design schemes towards performance optimization and realisation of timed arrays.
X-band phased array beam squint @ 20 o scan angle.

X-band phased array beam squint @ 20 o scan angle.
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Taxonomy of TTD lines.

Taxonomy of TTD lines.
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Diagram of 5bit switched planar TTD line.

Diagram of 5bit switched planar TTD line.
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block diagram of wideband array using digital delay line.

block diagram of wideband array using digital delay line.
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parameters of switched planar TTD lines

parameters of switched planar TTD lines
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