Based on your inquiry, it appears you are referring to the **FTS-75-R**, which is a high-performance **Surface Mount (SMT) Low Pass Filter** manufactured by **Mini-Circuits**. This component is specifically designed for RF (Radio Frequency) and microwave applications to allow signals below a certain frequency to pass while attenuating higher frequencies. --- ## Technical Specifications: FTS-75-R The following table outlines the primary electronic characteristics of the FTS-75-R: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Passband** | DC to 75 MHz | Signal range with minimal loss. | | **Insertion Loss** | < 1.0 dB | Power loss within the passband. | | **Stopband (20dB)** | 102 MHz | Frequency where attenuation reaches 20dB. | | **Stopband (40dB)** | 145 MHz | Frequency where attenuation reaches 40dB. | | **Impedance** | 50 $\Omega$ | Standard RF system impedance. | | **Max Input Power** | 0.5 Watts | Maximum RF power handling. | | **Package Type** | MS-001 (SMT) | Surface mount technology for PCB assembly. | --- ## Key Electronic Features ### 1. Frequency Response The "75" in the part number signifies the **Cut-off Frequency ($f_c$)**. * **DC to 75 MHz:** Signals in this range pass through with very low resistance (Insertion Loss). * **Rejection:** The filter is designed for sharp roll-off, meaning it quickly blocks noise and harmonics above 100 MHz. ### 2. VSWR (Voltage Standing Wave Ratio) The FTS-75-R typically maintains a low VSWR in the passband (around 1.3:1). This indicates high impedance matching, ensuring that signal reflections are minimized, which protects upstream components like power amplifiers. ### 3. Construction and Reliability * **Ruggedized Case:** Built to withstand harsh environments. * **Hermeticity:** Often used in applications requiring high reliability against moisture and oxidation. * **Operating Temperature:** Generally rated for **-55°C to +100°C**, making it suitable for military and industrial use. --- ## Typical Applications 1. **Harmonic Rejection:** Used after a signal generator or oscillator to remove unwanted harmonic frequencies. 2. **Transmitter/Receiver Front Ends:** Protecting sensitive electronics from high-frequency interference. 3. **Test Equipment:** Ensuring signal purity in laboratory measurements.