GATE study material and Ebooks for ECE

Digital Electronics
Digital Logic And Computer Design – Morris Mano
Digital Electronics Simon Haykin   with Solution
Operational Amplifiers For Everyone 
Network Theory
Circuit Analysis
Electric Circuits -Schaum’s Outlines
Switching Theory 
Communications:
Communication Systems – Simon Haykins
Principles Of Communication Systems – Taub & Schillings
Signals and System Schaum’s Outline Series 
Analog integrated circuits
Analog integrated circuits Solution Manual
Satellite Communication Handbook
Introduction to wave propagation, transmission lines and antennas.

Electromagnetic Theory:
Engineering Electromagnetics – William Hayt