In summary, there are three key factors to consider when researching a high frequency relay for an application: the impedance in ohms, the frequency band in Hz, and the desired high frequency characteristics: isolation, insertion loss, and the VSWR or return loss. Omron has a line of high frequency relays: the G6K-RF family, featuring 1 GHz and 3 GHz models, in surface-mount and through-hole packages. These relays have an impedance of 50 Ω for high frequency circuit applications. The G6K-2F-RF-S is ideal for high density mounting due to its reduced space terminal structure.