Electronics and Communication Engineering

It depends on your interest and other factors like, your field of graduation and your career prospects.
Major disciplines in MBA, you can look for are as follows:
1. Operations: It needs analytical knowledge with fair hands on mathematics.
2. Finance: It needs basic knowledge of accounting and share, equity, credit-debit transactions.
3. Marketing: It deals with promotion and advertising strategy to convince the target customers for your product.
4. HR: It requires good communication skills to deal with your team. You need to get the best out of your team and keep them motivated.
5. Mass communication: If you are interested in media and mass communication, have good speaking skills. You can look for this discipline.
In my view, ECE discipline won't be a big criteria in stream selection for MBA. Even an engineer can get the concepts of finance easily with some extra efforts.