Abstract: This document describes systems and techniques to perform simulation model fitting for radio frequency (RF) matching-network optimization. Using a simulation tool, a simulation model of the RF interface circuitry is generated with matching component values. Port impedances of the simulation model are adjusted to match at least one or more simulated scattering parameters to at least one or more actual scattering parameter of a physical prototype of the RF interface circuitry assembled with the same matching component values. An optimal load-pull location for the RF interface circuitry is also determined. The simulation model is then used to identify a matching pair that corresponds to the optimal load-pull location. In this way, the described systems and techniques can reduce engineering time and improve the accuracy of the tuning process.

Abstract: A mobile device includes sensors and a processor. The sensors are disposed on opposite edges of the mobile device respectively. The processor is configured to collect a first data set labeled with a right hand holding gesture, collect a second data set labeled with a left hand holding gesture, establish a determination model associated with the first data set and the second data set, and in response to the processor collects a third data set comprising the holding positions and the force values detected by the sensor, determine a current holding gesture according to the third data set in reference to the determination model.

Abstract: A mobile device includes sensors and a processor. The sensors are disposed on opposite edges of the mobile device respectively. The processor is configured to collect a first data set labeled with a right hand holding gesture, collect a second data set labeled with a left hand holding gesture, establish a determination model associated with the first data set and the second data set, and in response to the processor collects a third data set comprising the holding positions and the force values detected by the sensor, determine a current holding gesture according to the third data set in reference to the determination model.

Abstract: An open slot antenna is formed in a planar conductor on a dielectric substrate. A tuning circuit is disposed toward an open end of the slot antenna and is used to select a resonant frequency of the antenna by electrically connecting one of multiple tuning elements across opposing sides of the slot. The tunable antenna so constructed may be incorporated into a handheld mobile communication device that can be operated in different geographic regions, each having different regional communication standards under which mobile communications are conducted.

Abstract: A system for antenna extension and a method adapted for antenna extension operation under a specific communication protocol are provided. The antenna extension system combines a handheld communication device with a base device, and determines if the total antenna number of the handheld communication device and the base device matches the standard antenna number of the specific communication protocol. If the total antenna number of the handheld communication device and the base device matches the standard antenna number of the specific communication protocol, the antenna extension system enables the antenna extension operation.

Abstract: An open slot antenna is formed in a planar conductor on a dielectric substrate. A tuning circuit is disposed toward an open end of the slot antenna and is used to select a resonant frequency of the antenna by electrically connecting one of multiple tuning elements across opposing sides of the slot. The tunable antenna so constructed may be incorporated into a handheld mobile communication device that can be operated in different geographic regions, each having different regional communication standards under which mobile communications are conducted.

Abstract: A system for antenna extension and a method adapted for antenna extension operation under a specific communication protocol are provided. The antenna extension system combines a handheld communication device with a base device, and determines if the total antenna number of the handheld communication device and the base device matches the standard antenna number of the specific communication protocol. If the total antenna number of the handheld communication device and the base device matches the standard antenna number of the specific communication protocol, the antenna extension system enables the antenna extension operation.