What Are the Impedance Controls and Target Band Losses of SMA, IPEX, and Other RF Adapter Cables?Impedance Control and Target Frequency Loss of RF Adapter Cables

SMA and IPEX (also known as U.FL) are mainstream RF adapter cables for compact communication devices. Their impedance control is primarily 50 Ω to suit RF applications. Only SMA has a few 75 Ω versions for video applications. The target band loss increases with frequency and is influenced by cable specifications and materials. Detailed parameters are as follows:

SMA RF Adapter Cables:

Impedance Control: Mainly 50 Ω (for base stations, 4G/5G modules, and other RF scenarios); some 75 Ω versions (video applications, not compatible with 50 Ω).

Target Band Loss:

≤6 GHz: ~3.4 dB/m

6–18 GHz standard version: 7.5 dB/m

High-end version (silver-plated inner conductor + PTFE insulation): 3.8 dB/m

SMA-IPEX combination version at 6 GHz: ~4.5 dB/m

IPEX (U.FL) RF Adapter Cables:

Impedance Control: 50 Ω (for mobile phones, Wi-Fi modules, and other compact RF devices)

Target Band Loss:

2.4–5.8 GHz: insertion loss <4.3 dB/m

6 GHz (SMA conversion version): ~4.8 dB/m

0–12.4 GHz high-quality version: stable loss, RF leakage ≥-60 dB

Other Common RF Adapter Cables:

MMCX cables with thin wires: ≤6 GHz insertion loss typically <3.5 dB/m

SMP cables for high-frequency applications: maintain low insertion loss in 6–40 GHz, suitable for millimeter-wave and wideband transmission scenarios

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Kinghelm is a high-tech enterprise specializing in RF and connectivity solutions. The company offers a wide range of products, including Beidou/GPS antennas, Wi-Fi, Bluetooth, NB-IoT, LORA, Zigbee antennas, RF cables and connectors, board-to-board and plug-in connectors, switches, terminals, and customized automotive and industrial components. With over 17 years of experience, Kinghelm serves industries such as automotive, telecommunications, industrial automation, medical devices, and consumer electronics. Known for durable, reliable components that meet international standards, Kinghelm supports applications ranging from renewable energy to IoT devices.