High-Frequency Behavior Matters in Modern RF and Microwave Systems
At low frequencies, capacitors behave close to their ideal schematic models. At RF and microwave frequencies, that changes. Parasitic inductance and resistance begin to dominate component behavior, causing conventional capacitors to lose effectiveness above their self-resonant frequency (SRF). In many cases, the component intended to stabilize a design can instead introduce impedance peaks, resonance issues, EMI concerns, and degraded power integrity.
As system frequencies continue increasing across AI infrastructure, phased array radar, EW, SATCOM, and high-speed defense electronics, engineers are now forced to evaluate capacitor performance far beyond capacitance value alone.
Why Conventional Capacitors Become a Problem at High Frequency
Real-world capacitor performance is influenced by:
• Equivalent Series Resistance (ESR)
• Equivalent Series Inductance (ESL)
• Package geometry
• Electrode structure
• PCB interconnect parasitics
• Via and return path inductance
Above SRF, capacitors transition from capacitive behavior toward inductive behavior.
This can directly impact:
• PDN impedance stability
• RF signal integrity
• Timing margins
• EMI performance
• Noise suppression effectiveness
• High-speed switching behavior
In advanced RF systems, these effects can no longer be ignored during component selection.
Eulex XG Series: Designed for RF and Microwave Performance
The Eulex XG series was developed specifically for demanding high-frequency applications requiring low parasitics and stable RF behavior.
Key Advantages
• Ultra-low ESR and ESL
• Excellent high-frequency impedance characteristics
• Stable performance across RF operating ranges
• Compact footprint options
• High reliability construction
• Designed for advanced defense and aerospace environments
The result is improved performance in applications where conventional capacitor behavior becomes a limitation.
Applications
Eulex XG capacitors support demanding RF and microwave systems including:
• Phased array radar
• Electronic warfare systems
• SATCOM
• AI and accelerated computing infrastructure
• RF power amplification
• High-speed digital systems
• Aerospace and defense electronics
