I am working on an IoT project which using BLE (Bluetooth Low Energy). The Device Case is Metal Body. In our testing we have found that without the Metal Body the Device BLE is working absolutely fine and connecting with the Mobile Phone efficiently.
But as soon as we apply the Metal Case on the Device BLE stopped working or working only within 6-8 inches of range. BLE is not able to advertise efficiently after applying the metal case.
We are using Nordic BLE Semiconductor 51822. It has BLE 4.2.
MS 0.8 mm Metal used for the Case.
Can anybody suggest how to improve the BLE Advertising Range within the metal case?