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Knowles Milli-Cap Ultra Broadband Capacitors Suits up to 50GHz Applications 

4.5.2023
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Knowles Precision Devices’ SMT Ultra Broadband Capacitors Milli-Cap® are designed to deliver reliable, ultra-low loss operation across a variety of applications including test equipment, fiber optic modules and broadband microwave/millimeter systems as ideal broadband blocking capacitors. It offers low frequency stability over extreme temperatures, space-saving footprints and more. 

High-speed broadband and fiber optic devices used across a variety of communication and military and aerospace applications require circuits that couple RF signals.

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Since this involves removing the DC component and allowing only the high-frequency AC component to pass or bypass, this can be a complicated process.

The blocking capacitor needs to present a near reflection-less transition at the frequency the line is seeing and at a bandwidth that allows the entire signal to pass without degradation. 

While there are a number of broadband blocking capacitors on the market today, many struggle to provide low insertion loss over a broad frequency range. Knowles Precision Devices’ Broadband Milli-Cap® capacitor is designed to be the ideal single-piece construction surface mount (SMT) capacitor for broadband applications up to 50 GHz (most competitors only support up to 40 GHz). Milli-Cap’s voltage rating is the highest in the market while also offering the lowest insertion loss (see Figure 1).

Figure 1. This insertion loss plot shows two different Milli-Cap capacitors operating reliably up to 50 GHz; source: Knowles

Milli-Cap comes in three case sizes, which is the most options available for a high-performance SMT broadband blocking capacitor (Figure 2).

Figure 2. This chart shows the dimensions of the three different Milli-Cap capacitor offerings and a diagram of a Milli-Cap capacitor.; source: Knowles

Milli-Cap capacitors at each of these three case sizes are constructed using a variety of Class I and Class II dielectric materials depending on the temperature needs of the application. Milli-Cap is also orientation insensitive, which means there is no wrong way to attach the capacitor to your assembly. Additionally, Milli-Cap capacitors can be attached to a soft or hard substrate using a conductive epoxy or solder.

To summarize, the key features of our broadband Milli-Cap blocking capacitors are as follows:

  • 0201, 0402, and 0602 footprints
  • Low-loss, High Q
  • Very low series inductance
  • Ultra-high series resonance
  • Matches typical 50Ω line widths
  • Behaves like an ideal capacitor
  • Single-piece construction
  • Orientation insensitive
Source: Knowles

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