ZXLF-K173+

Overview

The ZXLF-K173+ is a reflectionless low-pass filter manufactured by Mini-Circuits, designed for high-frequency signal conditioning. It features a passband extending from DC to 17 GHz and a stopband covering 18 to 40 GHz. The component operates with a nominal impedance of 50 Ohms and utilizes 2.92mm connectors for termination. It supports an operating temperature range from -40°C to +85°C. Typical insertion loss at 10 GHz is 0.31 dB, rising to 0.34 dB at 100 GHz. Voltage Standing Wave Ratio (VSWR) remains low, typically around 1.03:1 at 10 GHz.

Feature Summary

• Reflectionless architecture eliminates signal reflections in the stopband
• Wide bandwidth coverage from DC up to 17 GHz
• Integrated internal termination for improved system stability

Applications

• High-performance S-band upconverter assemblies
• RF and microwave signal conditioning systems
• Test and measurement equipment requiring wideband filtering

Procurement Notes

Verify the specific suffix designation against official Mini-Circuits documentation to ensure correct connector type and compliance status. Confirm that the 2.92mm termination matches your PCB or cable assembly requirements. Check RoHS and REACH compliance declarations for regulatory adherence in your target market. Ensure thermal management aligns with the specified -40°C to +85°C operating range during integration.

Selection Notes

Select this component when stopband reflections must be absorbed rather than reflected, which is critical in multi-stage filter designs or sensitive receiver front-ends. The 17 GHz cutoff frequency suits applications requiring broad baseband preservation while attenuating higher harmonics. Compare insertion loss specifications against system noise budget requirements. Ensure the 50 Ohm impedance matches the rest of the transmission line to minimize VSWR-related signal degradation.

Part Context

This part belongs to the ZXLF series of reflectionless filters from Mini-Circuits, engineered for broadband RF and microwave applications. Unlike traditional absorptive filters, this design integrates termination resistors internally to prevent reflected energy from interfering with upstream components. The series is characterized by compact form factors and consistent performance across wide frequency spans, making it suitable for modern communication infrastructure.

FAQ

How does the reflectionless design differ from standard low-pass filters?

Standard low-pass filters reflect out-of-band signals back toward the source, potentially causing instability. The ZXLF-K173+ absorbs these signals internally, preventing reflections and improving system stability in complex RF chains.

What is the maximum operating frequency for effective filtering?

The filter provides a passband up to 17 GHz. Effective attenuation begins at 18 GHz, with the stopband extending through 40 GHz as per typical performance data.