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

K. Sreenivasulu; Dr. K. P. RAY; Dr. VENGDARAJAN

doi:10.14429/dsj.72.17436

K. Sreenivasulu LRDE, Defence Reaserch and Development Organisaiton (DRDO), Bangalore -560093 https://orcid.org/0000-0002-8869-2499
Dr. K. P. RAY Defence Institute of Advanced Technology (DIAT), Giri Nagar (PO), Pune, India https://orcid.org/0000-0002-8400-613X
Dr. VENGDARAJAN Electronics and Radar Development Establishment (LRDE), DRDO, C.V.Raman Nagar (PO), Bangalore, India https://orcid.org/0000-0001-5997-0579

DOI: https://doi.org/10.14429/dsj.72.17436

Keywords: True Time Delay, Timed array, MMIC, T/R Modules, Photonic Integrated Circuit, UWB, Phased array, RFSOC, FPGA

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.