Communication Apparatus Single Coupler Power Detector Switching

The patent merges multiple couplers and power detectors into a single shared coupler and power detector by introducing a switching element. The switching element connects the single coupler to different frequency band filters (e.g., low band, mid band, high band filters) sequentially, allowing one detector to measure power across multiple frequency bands without requiring separate detection circuits for each band.

The single power detector is designed to universally detect power levels across multiple frequency bands by receiving signals filtered through different band-specific filters. The detector functions as a multi-functional component that can measure low band, mid band, and high band powers sequentially controlled by the switching element, eliminating the need for multiple specialized detectors.

The patent combines multiple power-consuming detection circuits into a single shared detection circuit. By using one coupler and one power detector that are sequentially switched across different frequency bands, the system eliminates the redundant power consumption of multiple simultaneously operating detection circuits while maintaining the capability to detect all frequency bands.

The switching element implements periodic action by sequentially connecting the single power detector to different frequency band filters at different time intervals. The detector measures low band power, then mid band power, then high band power in a periodic sequence, allowing comprehensive frequency band detection capability while ensuring that only one detection circuit is active at any given moment, thus minimizing power consumption.

The patent applies local quality by providing signal amplification only in specific locations (shadow areas inside vehicles or buildings) where poor radio wave environments exist, rather than blanket amplification throughout the entire coverage area. The relay device is strategically placed to detect and amplify signals only in the local shadow area, improving communication rate locally without causing widespread radio wave interference.

The relay device uses feedback by measuring the power levels of downlink signals across different frequency bands using the single power detector and switching element. Based on this feedback information about signal strength and frequency band characteristics, the device intelligently determines which frequency bands require amplification and adjusts amplification accordingly, thereby improving communication in shadow areas while minimizing unnecessary amplification that could cause interference.