introduction to electromagnetic simulation

plz someone help me in finding books or websites to know about the what is electromagnetic simulation and why em simulation.i am currently using awr microwave office.i want to know about basics of em simulation.plz plz help me.........
thank you

em: talk - Electromagnetics and Microwave Engineering is a good site to start with

here is the youtube channel for AWR

Kana

and here is thier page of example designs

AWR | Application Notes & Design Examples | AWR Microwave Office application notes and design examples

thank you very much

---------- Post added at 14:50 ---------- Previous post was at 14:35 ----------

what they have suggested me is good.....and i want more than that......plz help me in finding

http://www.amazon.com/Introduction-D.../dp/1608071553

"Computational Electromagnetics for RF and Microwave Engineering" by Davidson

Computational Electromagnetics for RF and Microwave Engineering: Amazon.co.uk: David B. Davidson: 9780521518918: Books

is good IMHO. It covers mainly FEM, MoM and FDTD methods, with almost no coverage of other techniques like TLM. This is because the first 3 are really the main methods used - I don't think there's any serious 3D EM simulator which does not use one of those 3 methods. The maths in the book starts off pretty easy, but gets progressively more difficult. There's a bit of an emphasis on FEKO, but overall pretty balanced.

I'm certainly glad I purchased a copy, even though it came from my own pocket - my employer did not buy it.

Dave

thank you for ur assistance......

How can i change the frequency range in axiem in AWR.i change the range on options tab but the simulator calculates between 1-2gHz.Can u help me?Thanx in advance...