Abstract:
Very small size true directional couplers (100) have a coupling coefficient that is independent on load VSWR. The coupler (100) uses coupled inductors (114,116,118) with a compensation circuit including a resistor (112) and a capacitor (110), or just a capacitor (110). Wideband operation is suitable for many portable applications such as power detection (306) and control for GSM (302), DCS-PCS (310), CDMA/WCDMA, Bluetooth, and WLAN systems.
Abstract:
Very small size true directional couplers have a coupling coefficient that is independent on load VSWR. The coupler uses coupled inductors with a compensation circuit including a resistor and a capacitor, or just a capacitor. Wideband operation is suitable for many portable applications such as power detection and control for GSM, DCS-PCS, CDMA/WCDMA, Bluetooth, and WLAN systems.