Provided is a coordinate conversion apparatus and method capable of removing an accumulation position error when output pixel coordinates are obtained from input image coordinates by using an inverse-mapping technique. A network element suited to allow fast and effective restoration in a fixed wireless transmission network has a directional antenna and corresponding control circuitry which are controlled by a control device to redirect transmission direction in the case of a failure. Memory stores sensor data derived from the at least one gyroscope and accelerometer, where the sensor data describes movement of the device including a rotation of the device around at least one of the three axes of the device, the rotation causing interaction with the device. The pair of antenna elements and the slot line are arranged in mirror symmetry with respect to a magnetic field plane or electric field plane which starts at the feed end, so that the pair of antenna elements is excited in phase.