Abstract: Clip-worn apparatuses having sensor clips configured to detect whether electronic devices, such as communications headsets, are being worn (i.e., “donned” or “DON'd”) or are not being worn (i.e., “doffed” or “DOFF'd”) by a user. An exemplary clip-worn apparatus includes a DON/DOFF sensor clip having a clip with a first end and an opposing second end. The first end includes a source (e.g., a light source). The opposing second end includes a detector (e.g., a light detector). When the clip-worn apparatus is DOFF'd, a detection path between the source and the detector is clear and unobstructed. When the clip-worn apparatus is DON'd (by clipping the DON/DOFF sensor clip to a target object, e.g., a user's ear), the target object becomes positioned between the source and the detector, thereby obstructing the detection path between the source and the detector.

Abstract: Methods and apparatuses for reporting user presence associated with orientation and proximity of a user to a display device are disclosed. In one example, image data associated with a head mounted device and one or more infrared light sources is captured and processed to identify the presence of infrared light source objects. A detection status is output based on the presence of infrared light source objects, and the detection status is translated to an associated user presence state.

Abstract: A method and apparatus for determining proximity of a mobile radio relative to its base radio. Antenna diversity is utilized to provide improved proximity detection, such as NEAR state or FAR state, of the mobile radio relative to its base radio.

Abstract: A small multi-band planar inverted-F antenna (PIFA) includes a metal radiating element that is physically located above a metal ground plane element, and the space therebetween includes a frequency matching network having a microstrip transmission line that connects an antenna feed to a wireless communications device (WCD) feed. The impedance matching network may include a microstrip impedance transformer whose output provides a 50 ohm connection to the WCD. A number of microstrip stubs are connected to the microstrip transmission line. At least some of the microstrip stubs connect to the microstrip transmission line by way of a LC tank circuit. The LC tanks circuits are responsive to different ones of the multiple frequencies to which the PIFA is responsive, and in this manner the impedance matching network is dynamically reconfigured in accordance with the frequency band currently traversing the microstrip transmission line. The LC tanks circuits include discrete capacitors and inductors.