If you are using Windows 7 or 8, you can easily setup your own home Wi-Fi Network without a router, and share your internet to your other multiple devices such as your smartphone, tablet or your another computer.
Below are simple steps using which you can create your own Wi-Fi Network:
1) You should have Windows 7 or 8 installed on your computer. It should have internet connection to be shared over Wi-Fi network.
2) Most of today\’s computer come already enabled with Wi-Fi capabilities (wireless network card). So if you computer is not too old, it must have already equipped with built-in Wi Fi. If your computer is too old, you can also buy a USB network adapter.
3) Finally, download and install a simple, free utility called Virtual Router. After installation, open the Virtual Router. You can choose your own network name and password to connect. You can also select the connection you want to share over Wi-Fi. Click “Start Virtual Router” and you are done! You can now easily find and connect to your Wi-Fi network using your phone, tablet or another computer.
Source : http://engineeringbuddies.com/home/content/easily-create-your-own-home-wi-fi-network-without-router