How to Quickly Select Connector Contacts with Correct Interface Type and Polarity for Different Main Devices and Frequency Bands?

Quick Selection Method for Connector Contacts Based on Device and Frequency Band

Connector contacts can be quickly selected by following the three-step process: “Main Device Type → Frequency Range → Interface & Polarity Matching Rules”, while considering high-frequency compatibility and mechanical reliability.

1. Select Interface by Device Type:

• Mobile terminals: MMCX, IPEX
• Base stations and routers: SMA, N-type
• Satellite communication and test equipment: SMP, 2.92 mm
• Automotive terminals: FAKRA preferred, also QMA, TNC

2. Refine by Frequency Band:

• ≤6 GHz (5G Sub-6G): SMA, QMA, MMCX
• 6–40 GHz (Millimeter wave): SMP, 2.92 mm, 3.5 mm
• ≥40 GHz: 1.85 mm, 1.0 mm

3. Polarity Matching Rules:

• Device female (F) pairs with male (M), and vice versa
• For high frequencies, straight connectors preferred (bent connectors ≤0.3 dB insertion loss)
• Maintain consistent polarity for batch devices

4. Selection Verification:

• Confirm interface type (e.g., SMA-J, F)
• Interface frequency ≥ upper limit of application band
• Outdoor/automotive: use connectors with locking mechanisms
• Indoor: micro connectors without locks are acceptable

About Kinghelm
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.