There are too many available applications that allow you to ban others from using your personal WIFI network. I highly recommend NetCut, its a very good application. It will do a scan for you to detect connected devices allowing you to block users from using your Wi-Fi network. The app is available for Windows desktop and android.

How to:
-Download the app from the link bellow!
-Scan to check if there are any connected devices.
-After it, to ban others from using your Wi-Fi, click on the red icon that takes Wi-Fi shape. netcut
-To allow other, click on the blue icon. Easy peasy 🙂

Click here to download the app from Google play store
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NetCut features:

  1. You can quickly detect all network user in WIFI, even when your phone has no valid IP address or not been granted use wifi internet. as long as you connected to any WIFI,’s netcut can work.
    2. Set on/off line to any network users, including phone/xbox,softphone, PS3, PS4 etc.
    3. You can cut off network between two network users within LAN , by set one of the user as “gateways” , then cut off the other users, then those two users won’t beable to talk to each other, eg: apple TV, Google TV, xiaomi box , cut off the phone connection to those box, will disable screen cast like feature.
    4. Netcut Defender built in. (turn on and off in one click)
    5. Scan network when you feel there are users still on network and you can’t see it.
    6. Check phone type, netcut will be able list type of phones.
    7. Give user easy to remember name. Long press any network user, a pop up window will allow you input name for the user.
    8. Detect attacker, if any one try to play arp spoof to you, you will be able to see it from netcut directly.

Click here to download the app from Google play store
Source: Google play