The **KPAU-B2M2-R** is a specific model of an **Antenna Internal Cable / Pigtail Assembly**, typically used in wireless networking hardware. It serves as the bridge between a wireless module (like a Wi-Fi card) and an external antenna connector. Below is a detailed breakdown of its electronic components and technical specifications. --- ## 1. Physical and Electronic Components | Component | Specification | Description | | :--- | :--- | :--- | | **Connector A** | **U.FL (IPEX/MHF1)** | A miniature RF connector that plugs directly onto a M.2 or Mini-PCIe wireless card. | | **Connector B** | **RP-SMA Female** | A bulkhead connector with a threaded exterior and a center pin (Reverse Polarity SMA). | | **Cable Type** | **RG-178 / 1.13mm** | Coaxial cable designed for high-frequency signal integrity and minimal loss. | | **Length** | **200mm (Standard)** | The "2M" in the part number often refers to the 20cm length. | --- ## 2. Technical Specifications ### RF Performance * **Frequency Range:** 0 to 6 GHz (Supports Wi-Fi 2.4GHz, 5GHz, and Wi-Fi 6E). * **Impedance:** 50 Ohms (Standard for RF communication). * **VSWR (Voltage Standing Wave Ratio):** Typically ≤ 1.5:1, ensuring efficient power transfer with minimal reflection. ### Mechanical Properties * **Bulkhead Mount:** The RP-SMA end features a nut and washer, allowing it to be securely mounted to the chassis of an industrial PC or router. * **O-Ring:** Many versions include a rubber O-ring for environmental sealing (water/dust resistance). --- ## 3. Common Applications This part is essential in the following hardware setups: 1. **Industrial PCs:** Connecting internal M.2 Wi-Fi modules to the outer casing. 2. **Custom Router Builds:** Used with boards like Raspberry Pi (with HATs) or Jetson Nano. 3. **IoT Gateways:** Ensuring the internal radio signal reaches an external high-gain antenna. --- ## 4. Part Number Breakdown (KPAU-B2M2-R) * **KP:** Manufacturer prefix (often KPEW or similar brands). * **AU:** Refers to the U.FL connector type. * **B2:** Indicates a Bulkhead SMA style. * **M2:** Refers to the cable length (200mm). * **R:** Signifies **RP-SMA** (Reverse Polarity), the standard for Wi-Fi equipment.