Coplanar board to board connector are designed to create a flat, parallel connection between the boards, with the contact points on the same level.

Key features of coplanar board-to-board connectors include:

1. Coplanar Design: These connectors are engineered to maintain the alignment and parallel orientation of the two PCBs, ensuring that the contact points on both boards are in the same plane.

2. High-Speed Data Transmission: Coplanar connectors are commonly used in high-speed data and signal transmission applications, such as those found in telecommunications equipment, data centers, and high-frequency applications.

3. Controlled Impedance: They are often designed with controlled impedance to ensure signal integrity and minimize signal loss in high-frequency applications.

4. RF and Microwave Applications: Coplanar board-to-board connectors are frequently used in radio frequency (RF) and microwave applications, where maintaining signal quality and minimizing interference are critical.

5. Multiple Contacts: These connectors typically have multiple contacts or pins, making them suitable for applications requiring a high number of connections.

6. Coaxial or Microstrip Configuration: Some coplanar connectors are designed in coaxial or microstrip configurations, where the signal lines are surrounded by shielding to minimize interference.

7. Variety of Form Factors: They come in various form factors, including right-angle and vertical orientations, as well as mezzanine connectors.