JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• 1. To understand the principle of electronic scanning and its application to a phased-array radar system.
• 2. To understand the concepts of cell, grid and feeding techniques.
• 3. To familiarize with the design of frequency scanned array and concepts of beam positioning.

Course Outcomes

At the end of this course, students will be able to

• 1. Analyze the basic concepts of radar beam steering and determine the direction of a resultant beam.
• 2. Apply the electronically scanned system in different applications
• 3. Use the phase shifters and feed networks in the frequency scanned array design.

UNIT - I

Conventional scanning techniques, Mechanical versus electronic scanning, Techniques of Electronic scanning, Frequency, Phase and time delay scanning principle, Hybrid scanning techniques.

UNIT - II

Array Theory, Linear and Planner arrays, various grid configuration, Concept of cell and grid, Calculation of minimum number of elements, Radiation pattern, Grating lobe formation, Rectangular and triangular grid design of arrays.

UNIT - III

Feed Networks for phased Arrays, Corporate Feed, Lens and Reflect feed Techniques, Optimum f/d ratio basic building block for corporate feed network, Series, Parallel feed networks, Comparison of various feeding techniques, Antenna Array Architecture, Brick/ Tile Type construction.

UNIT - IV

Frequency scanned array design, Snake feed, Frequency-phase scanning, Phase scanning, Digital phase shifter PIN diode and Ferrite phase shifters for phased arrays, Beam pointing errors due to digitalization, Beam pointing accuracy.

UNIT - V

Search patterns, Calculation of search frame time, Airborne phased array design, Electronic scanning radar parameter calculation, Application of phased arrays, Phased Array Radar Systems, Active Phased Array, TR/ATR Modules.

TEXT BOOKS:

• 1. Olliner & knittel- Phased Array Radar, Artech House, 1972.
• 2. Kahrilas, PJ - Electronic Scanning Radar Systems Design Handbook, Artech House, 1976.

REFERENCE BOOKS:

• 1. Skolnik, MI - Radar Handbook, McGraw Hill, NY, 1970.
• 2. Hansen, RC - Significant Phased Array Papers.
• 3. Galati, G -Advanced Radar Technique and Systems, Peter Peregrims Ltd, London, 1993. M.TECH.- I YEAR- II SEMESTER MICROWAVE AND RADAR ENGINEERING