IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

This paper presents the experimental characterisation of Moreno cross-slot coupler which is the basic building block of multiple beam forming network (Blass matrix). The lack of exact theory of such coupler requires extensive experimental evaluation. A novel test jig has been designed, fabricated and tested for this purpose. The experimental results for different scattering parameters are presented.

World University root node

Department of Electrical Engineering

Defence Science Journal

Experimental characterisation of Moreno cross-slot couplers for blass matrix design

In this paper, we present the issues of design, fabrication and testing of planar monopulse comparator. An X-band monopulse comparator has been designed using side wall coupler as a building block. Individual side wall couplers are optimized using finite element method. The side wall coupler is converted to an equivalent of magic tee, by adding quarter guide wave length to one of the input of the side wall coupler. Four such hybrids are connected appropriately using H-plane bends to form a compact two plane monopulse comparator. The theoretical and experimental performances of this comparator are also presented.

IEE Conference Publication

Computer aided design of planar waveguide monopulse comparator for low height airborne antennas

LRDE has setup an automated planar near field measurement facility with a size of 18 Mtrs X 12 Mtrs X 10 Mtrs. This paper discusses anechoic chamber related issues, such as the requirement of absorbers, quiet zone etc. which were faced during the design stage. A novel technique to enhanced the quiet zone with commercially available absorbers, with -40 to -50 dB reflectivity is explained.

Proceedings of the International Conference on Electromagnetic Interference and Compatibility

Anechoic chamber related issues for very large automated planar near field range

The paper deals with the design and development of a dual polarised corrugated conical horn employed as a feed for parabolic reflector antennas used in very small aperture terminal applications. The VSAT antenna feed is designed, fabricated and tested to operate over a band from 3.7 GHz to 6.5 GHz with good pattern symmetry, low side lobes and low cross-polarisation.

Design &amp; development of VSAT antenna feed

This paper discusses the design details of a septum based unequal power divider with multiple ports. It also covers the types of fabrication techniques adapted and their effect on the performance of the power dividers. Tables of results are also included to bring out the close correlation between the design and measured results. Comments on the bandwidth performance of these power dividers with results are presented. Results of studies on the effect of errors in these power dividers for low sidelobe antennas is shown.

IEEE International Symposium on Phased Array Systems and Technology

Design aspects of compact high power multiport unequal power dividers

The present paper deals with the design and development of a corrugated conical horn along with an Orthomode Transducer (OMT) employed as a feed for reflector antennas used in very small aperture terminal applications. The dual polarized feed is designed to operate over a band from 3.7 GHz to 6.5 GHz with good pattern symmetry, low side lobes and low cross polarization. © 1995 by the IETE.