Abstract: Technology for a signal booster is disclosed. The signal booster can include a first antenna configured to communicate signals with a wireless device. The signal booster can include a second antenna configured to communicate signals with a base station. The signal booster can include a signal amplifier configured to amplify and filter signals for communication to the base station via the first antenna or for communication to the wireless device via the second antenna. The first antenna can be configured to be coupled to the second antenna to form a bypass signal path that bypasses the signal amplifier.

Abstract: Technology for a repeater is disclosed. The repeater can include a narrowband detector configured to detect one or more power levels that correspond to one or more signals communicated in one or more sub-bands of a selected band. The repeater can include a controller. The controller can select a signal from the one or more signals based on a power level of the selected signal. The controller can adjust a gain or output power of the repeater based on the power level of the selected signal communicated in the one or more sub-bands of the selected band.

Abstract: Technology for a signal booster is disclosed. The signal booster can include a first antenna configured to communicate signals with a wireless device. The signal booster can include a second antenna configured to communicate signals with a base station. The signal booster can include a signal amplifier configured to amplify and filter signals for communication to the base station via the first antenna or for communication to the wireless device via the second antenna. The first antenna can be configured to be coupled to the second antenna to form a bypass signal path that bypasses the signal amplifier.

Abstract: Technology for a signal booster is disclosed. The signal booster can include a signal amplifier configured to amplify and filter signals for a wireless device. The signal booster can include one or more detectors configured to detect power levels of the signals. The signal amplifier can include at least one of: one or more bypassable amplifiers or one or more switchable band pass filters that are configurable depending on detected power levels of the signals.

Abstract: Technology for a wireless device signal amplifier sleeve is disclosed. The wireless device signal amplifier sleeve can include a housing that encloses at least a portion of a wireless device. The wireless device signal amplifier sleeve can include a cellular signal amplifier integrated with the wireless device signal amplifier sleeve. The cellular signal amplifier can be configured to amplify signals for the wireless device. The wireless device signal amplifier sleeve can include a battery integrated with the wireless device signal amplifier sleeve. The battery can be configured to provide power to the cellular signal amplifier and the wireless device.

Abstract: A controllable antenna system is disclosed. The system comprises a directional antenna configured to be directed in a selected direction. A radio frequency detector is configured to measure a power level of a signal. A control unit is configured to send a control signal to direct a directional antenna in a selected direction based on the measured power level to transmit or receive. A signal booster may be configured to reduce attenuation and/or increase signal quality of the signal.