### Overview of ANT-2.4-WRT-RPS The **ANT-2.4-WRT-RPS** is a high-performance, compact, "bolt-on" antenna designed specifically for 2.4 GHz ISM band applications. Produced by **Linx Technologies** (now part of TE Connectivity), it is widely used for Wi-Fi, Bluetooth, ZigBee, and proprietary wireless systems where a low-profile, tamper-resistant solution is required. --- ### Key Technical Specifications | Feature | Description | | :--- | :--- | | **Frequency Range** | 2.4 GHz to 2.5 GHz | | **Connector Type** | RP-SMA (Reverse Polarity SMA) | | **Antenna Type** | Monopole (requires a ground plane) | | **Gain** | 1.1 dBi (Peak) | | **VSWR** | ≤ 1.9 (at center frequency) | | **Impedance** | 50 $\Omega$ | | **Mounting** | Permanent bulkhead (screw-mount) | --- ### Internal Electronic Design #### 1. The Monopole Element Internally, the antenna consists of a precisely tuned radiating element. Because it is a **monopole**, it relies on the device's chassis or PCB ground plane to act as the "other half" of the dipole. The size and shape of the ground plane significantly impact the antenna's radiation pattern and efficiency. #### 2. Coaxial Interface The antenna uses a small internal coaxial cable (usually RG-174) that connects the radiating element to the **RP-SMA connector**. The RP-SMA is a variation of the standard SMA connector where the "pin" and "socket" roles are reversed to comply with specific FCC regulations for consumer Wi-Fi equipment. #### 3. Radome and Materials * **Radome:** The outer shell is made of UV-stabilized plastic, protecting the internal electronics from environmental factors. * **Base:** Features a weather-resistant seal (often an O-ring) to prevent moisture ingress through the mounting hole. --- ### Radiation Pattern Characteristics The ANT-2.4-WRT-RPS is **omnidirectional**. This means it radiates energy equally in all directions on the horizontal plane (360 degrees), making it ideal for devices that need to communicate with multiple nodes in different directions. --- ### Installation Requirements To achieve the electrical performance listed in the datasheet, the following must be considered: * **Ground Plane:** It must be mounted through a conductive surface (metal) or have a ground plane on the PCB of at least $10cm \times 10cm$ for optimal resonance. * **Cable Routing:** The internal 8.5-inch (approx.) cable should be routed away from high-noise components (like switching power supplies) to avoid EMI interference.