The **CPL2-3-50TR-R** is a high-frequency, surface-mount **directional coupler** manufactured by Eaton (formerly Cooper Bussmann). It is specifically designed for power monitoring and signal analysis in wireless communication applications. --- ## 1. Technical Specifications The following table highlights the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Component Type** | Directional Coupler | | **Frequency Range** | 700 MHz to 2700 MHz | | **Coupling Factor** | 20 dB (Nominal) | | **Insertion Loss** | 0.20 dB (Typical) | | **Impedance** | 50 $\Omega$ | | **Power Rating** | 3.0 Watts | | **Package / Case** | SMD (Surface Mount Device) | | **Operating Temp** | -40°C to +85°C | --- ## 2. Key Electronic Functions A directional coupler like the CPL2-3-50TR-R is a passive 4-port device (though often integrated as a 3-port in specific layouts) used for signal sampling. ### Signal Sampling It allows a main signal to pass from the **Input** to the **Output** with minimal loss (Insertion Loss), while "bleeding off" a small, known fraction of that signal to a **Coupled Port**. ### Typical Port Configuration 1. **Input Port (P1):** Where the high-power signal enters. 2. **Output Port (P2):** Where the majority of the signal exits. 3. **Coupled Port (P3):** Where the 20dB attenuated sample of the signal is sent for measurement. 4. **Isolated/Terminated Port:** Usually internal or grounded to prevent reflections. --- ## 3. Design and Construction * **Low Profile:** The "2-3" in the part number often refers to the physical dimensions (approx. 2.0 x 3.0 mm), making it suitable for compact mobile devices. * **Broadband Performance:** It covers the most common LTE, 4G, and early 5G sub-6GHz frequency bands. * **Halogen Free:** Compliant with modern environmental standards (RoHS). --- ## 4. Common Applications This part is typically found in the RF (Radio Frequency) front-end of electronic circuits: * **Power Control:** Monitoring the output power of a Power Amplifier (PA) to adjust gain dynamically. * **Antenna Monitoring:** Detecting reflected power to calculate VSWR (Voltage Standing Wave Ratio) to ensure the antenna is functioning correctly. * **Signal Leveling:** Maintaining a constant signal strength in signal generators.