The **18AS2-31-R** is a high-performance, precision RF (Radio Frequency) fixed attenuator, typically manufactured by companies like **Rosenberger** or similar high-end RF component specialists. These components are critical for controlling signal levels within coaxial systems. --- ### 1. Technical Specifications The following table summarizes the primary electrical and mechanical characteristics of the 18AS2-31-R: | Feature | Specification | | :--- | :--- | | **Component Type** | Fixed Coaxial Attenuator | | **Connector Type** | SMP (Sub-Miniature Push-on) | | **Gender** | Plug (Male) to Jack (Female) | | **Attenuation Value** | 31 dB | | **Frequency Range** | DC to 18 GHz (or higher depending on specific series) | | **Impedance** | 50 Ohms | | **Power Handling** | Usually 0.5W to 2W (Continuous Wave) | | **VSWR** | Typically ≤ 1.20:1 up to 12 GHz | --- ### 2. Key Component Details #### A. Connector Interface: SMP The "S" in the part number often refers to the **SMP interface**. SMP connectors are micro-miniature "push-on" or "snap-on" connectors. They are ideal for high-density packaging and are often used in: * Board-to-board connections. * Blind-mate applications (where you cannot see the connection being made). #### B. Attenuation (31 dB) The "31" in the suffix denotes the attenuation level. This part reduces the input signal power by **31 decibels**. Because 30+ dB is a significant reduction, this is often used to protect sensitive measurement equipment from high-power sources or to simulate long-distance signal loss. #### C. Material Construction To maintain signal integrity at 18 GHz, these parts use high-quality materials: * **Body:** Gold-plated Beryllium Copper or Stainless Steel. * **Dielectric:** PTFE (Teflon). * **Resistor:** Thin-film technology on a ceramic substrate to ensure flat frequency response. --- ### 3. Typical Applications * **Test and Measurement:** Used with Spectrum Analyzers to prevent "overdrive" of the input port. * **Telecommunications:** Level adjustment in base stations. * **Aerospace/Defense:** Used in radar and satellite communication systems due to the small form factor and high-frequency reliability. --- ### 4. Part Number Breakdown (Generic) While numbering varies by manufacturer, the code usually follows this logic: ```text 18 - Max Frequency (18 GHz) AS - Attenuator Series 2 - Connector Type/Size 31 - Attenuation Value (31 dB) R - RoHS Compliant ``` ---