Dear Mr Mohamed I am attaching one pdf file on coverage of wireless power transfer which will answer your query. Hope it helps.

HFSS is suitable for design

The design requires rating of power to be transmitted and its frequency. After getting data appropriate method will be selected to design system.

For basic magnetic coupled resonators all you need is a VNA and some wire! Measurements take far less time than simulations.

Cheers, Alanson

First you should determine application for which the WPT system is designed. Then choose the appropriate approach: Near-field (incutive or capacitive) or far-field (microwave, optical, propagating waves). You can find valuable information about IPT (inductive) in the book "Inductive Powering" written by R. Puers:

http://www.springer.com/us/book/9789048124114

Also if your aim is biomedical application look at "Wireless Power Transfer for Medical Microsystems":

http://www.springer.com/us/book/9781461477013

About software:

If the operating frequency is close to the self-resonance frequency (SRF) of coils - and electrical coupling contributes in power transmission - it is necessary to use full-wave simulators, HFSS is preferred. But if you are working at much lower frequencies where the link is purely inductive, you can use Maxwell or simple lumped circuit models in HSPICE, ADS or other circuit simulators.