Abstract: An arrangement for securing a touch sensor assembly within a mobile communication or other device with at least one touch button defined within a touch button area. The touch sensor assembly includes a touch sensor (such as a sense inductor coil), and multiple back-side spring clips attached at the back-side of the sensor assembly. A touch sensor pocket integral with the device case is disposed at an interior-side of the touch button area, the sensor pocket to position the sensor assembly relative to the associated touch button. The touch sensor assembly can be secured within the touch sensor pocket by the back-side spring clips, spring-urged toward the front-side of the sensor pocket, and spaced from the device case by spacer elements (which can be attached to the sensor assembly, or integrated into the device case). The touch sensor pocket can include back-side alignment elements for aligning the spring clips.

Abstract: A printed circuit board (PCB). The PCB comprises a non-conductive substrate and a plurality of conductive coil loops formed on the substrate, wherein the coil loops are asymmetric. The conductive coil loops are formed as a continuous metal trace on the substrate, the coil loops are symmetric with reference to a longitudinal axis of the PCB, the coil loops are asymmetric with reference to an axis transverse to the longitudinal axis of the PCB, wherein the distance between adjacent coil loops crossing the longitudinal axis on a first side of a center of an innermost coil loop are substantially equal, and the distance between adjacent coil loops crossing the longitudinal axis on a side of the center of the innermost coil loop opposite to the first side of the center of the innermost coil loop increase with each coil loop progressing outwards.

Abstract: An arrangement for securing a touch sensor assembly within a mobile communication or other device with at least one touch button defined within a touch button area. The touch sensor assembly includes a touch sensor (such as a sense inductor coil), and multiple back-side spring clips attached at the back-side of the sensor assembly. A touch sensor pocket integral with the device case is disposed at an interior-side of the touch button area, the sensor pocket to position the sensor assembly relative to the associated touch button. The touch sensor assembly can be secured within the touch sensor pocket by the back-side spring clips, spring-urged toward the front-side of the sensor pocket, and spaced from the device case by spacer elements (which can be attached to the sensor assembly, or integrated into the device case). The touch sensor pocket can include back-side alignment elements for aligning the spring clips.

Abstract: A printed circuit board (PCB). The PCB comprises a non-conductive substrate and a plurality of conductive coil loops formed on the substrate, wherein the coil loops are asymmetric. The conductive coil loops are formed as a continuous metal trace on the substrate, the coil loops are symmetric with reference to a longitudinal axis of the PCB, the coil loops are asymmetric with reference to an axis transverse to the longitudinal axis of the PCB, wherein the distance between adjacent coil loops crossing the longitudinal axis on a first side of a center of an innermost coil loop are substantially equal, and the distance between adjacent coil loops crossing the longitudinal axis on a side of the center of the innermost coil loop opposite to the first side of the center of the innermost coil loop increase with each coil loop progressing outwards.