Higher operating frequencies and tighter performance tolerances are reshaping how engineers approach RF system design. Increasing data rates and more compact architectures mean the physical interfaces that carry signals between components exert greater influence over the entire system behaviour. In many platforms, small variations at the connection point can affect timing stability and long-term reliability, which engineers previously managed more easily at lower frequencies. Here, Jamal Hagi, RF engineer at connector specialist PEI-Genesis, explores how these shifts are changing RF interconnect requirements from 5G to quantum computing.
Those same constraints are shaping RF design decisions across wireless infrastructure, defence electronics and industrial automation. Systems that once allowed generous electrical margins now operate closer to defined limits. This leaves less room for variation in materials, geometry or assembly quality.
Design teams are responding by paying closer attention to how RF signals are launched and protected as they move through complex assemblies.
How 5G reset the RF baseline
The shift toward higher-frequency design did not begin with AI or quantum computing. 5G marked a turning point by moving large-scale commercial deployments beyond the sub-6 GHz range that defined earlier generations of wireless technology. Millimetre wave operation introduced new constraints around loss control, impedance stability and mechanical precision.
This transition unfolded quickly. According to GSMA Intelligence, 5G reached 1.6 billion connections worldwide by the end of 2023 and is “expected to represent over half (51%) of mobile connections by 2029”. The scale of adoption has required RF components to perform consistently across dense architectures and tighter packaging, not only in mobile infrastructure but across a broader range of wireless systems.
At millimetre wave frequencies, assumptions that held at lower bands begin to break down. Connector geometry, shielding effectiveness and material selection play a more pronounced role in determining signal behaviour, particularly as systems continue to shrink. Even modest losses or impedance deviations can have an outsized effect when multiplied across complex signal paths.
AI, latency and system density
Growing use of AI across networked systems has introduced a different set of pressures on RF infrastructure. While much of the attention sits on processing capability, the movement of data between sensors, accelerators and control systems places equal strain on the signal paths that connect them. Low latency requirements make delays introduced at the physical layer more visible at system level, particularly in applications that rely on real-time analysis or autonomous decision making.
These demands surface most clearly in dense architectures, where multiple high-speed links operate in close proximity. Maintaining signal integrity under those conditions depends on careful control of impedance and shielding across the interconnect chain. At higher frequencies, interactions between adjacent paths become harder to manage.
These challenges are particularly visible in applications like phased array radar and 5G test platforms, where multiple high-frequency RF paths must operate predictably within compact assemblies.
Deployment trends suggest that these challenges extend beyond a limited set of flagship installations. A 2025 survey by GSA “identified 203 operators in 56 countries and territories investing in 5G mmWave network deployments”. This level of activity has increased demand for RF interfaces that support high data rates while maintaining predictable performance in compact system layouts.
Quantum as the next inflection point
Alongside AI, quantum computing is beginning to influence how engineers think about future RF interconnect requirements. Although many quantum systems remain in development, quantum technologies place greater emphasis on precision and material behaviour. These factors extend trends established during the 5G transition rather than replacing them.
Signal paths operating near quantum components must manage extremely tight tolerances around stability. In this environment, inconsistencies in connector construction or material selection introduce variability that is difficult to correct later in the design cycle, particularly when specialised material requirements further narrow the margin for error.
Public investment signals suggest these considerations are moving steadily from research into long-term planning. A 2025 briefing from the UK Parliamentary Office of Science and Technology notes that “the UK invested over £1 billion into quantum technologies to 2024” while “the 2023 UK National Quantum Strategy committed £2.5 billion for the next 10 years”. This trajectory supports the view that quantum will increasingly shape engineering priorities, even before large-scale deployment becomes commonplace.
Consequences of treating RF interconnects as secondary
At higher frequencies, weaknesses in the RF interface surface quickly. Insertion loss, impedance mismatch and unwanted coupling distort signals in ways that compromise timing accuracy and system stability, particularly as architectures scale within constrained physical spaces.
Reliability concerns extend beyond electrical performance alone. Mechanical stress and environmental exposure influence how consistently an interconnect behaves over time. Experience across high-frequency applications shows that these issues become difficult to resolve once systems reach late-stage development.
This reinforces the importance of addressing RF interconnect performance as part of the initial system architecture rather than relying on mitigation later in the design cycle.
Engineering responses at higher frequencies
Connector manufacturers have responded by refining designs to support higher frequencies within smaller footprints. Advances in geometry control and shielding techniques, alongside material selection, enable interconnects to operate reliably at millimetre wave frequencies while fitting into increasingly compact assemblies. Multi-port configurations and reduced-profile interfaces help manage density without sacrificing electrical performance.
In dense assemblies operating at millimetre wave frequencies, blind-mate RF interfaces help maintain predictable performance while simplifying installation and maintenance. Cinch Johnson’s SMP and SMPM connectors are designed for applications where controlled impedance and mechanical tolerance matter, particularly as channel density increases. Their small form factor supports higher port counts, while blind-mate capability reduces alignment complexity during assembly, making them well suited to high-frequency test platforms, sensing systems and defence electronics.
Material behaviour takes on greater significance as frequency increases. Dielectrics, contact plating and housing materials influence loss characteristics and signal stability, particularly when systems operate across wide temperature ranges or under mechanical stress. For applications that extend beyond controlled environments, high-frequency performance must coexist with resistance to vibration and wear, which places additional demands on mechanical construction.
Value of early engagement in RF interconnect design
These trends place greater emphasis on decisions made early in the design process. At higher frequencies, interconnect selection influences layout options and long-term serviceability, making early evaluation essential for reducing uncertainty.
Early communication between system designers and interconnect specialists helps ensure connector requirements are understood before layouts are finalised, supporting more stable outcomes as systems combine high-speed data paths with demanding mechanical constraints.
The progression from 5G into AI-driven systems and emerging quantum applications has altered expectations around RF performance. Higher frequencies and denser architectures leave less room for variation at the physical interface, bringing interconnect behaviour into sharper focus during system design.
What began as a response to wireless network demands now influences a much broader range of technologies. Engineers working at the leading edge of performance must account for RF constraints alongside processing capability, supporting more predictable outcomes as frequency and system complexity continue to increase.
To find out more about high-frequency RF interconnect solutions, visit www.peigenesis.com.
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