Which of the following RF connector types is most suitable for frequencies above 400 MHz?

• A. PL-259
• B. Type N
• C. BNC
• D. UHF connector

Answer: (B)

Type N connectors are designed to operate effectively at higher frequencies, making them the most suitable choice for applications above 400 MHz. They feature a threaded coupling mechanism that provides a secure connection and a low-loss performance, which is crucial at these higher frequencies where signal integrity is essential.

The physical design of Type N connectors includes a characteristic impedance of 50 ohms, and they are crafted to minimize the effects of RF reflections and losses, which can become significant as frequency increases. This robustness and performance make Type N connectors a popular choice for both commercial and amateur radio applications in the VHF and UHF bands and beyond.

While other connectors like the PL-259, BNC, and UHF connectors have their specific uses, they are less effective at handling higher frequencies due to factors such as increased signal loss and potential reflections. As frequencies rise, the design limitations of these connectors can lead to a decline in overall system performance, making them less suitable compared to Type N connectors.