Low-loss RF coupler for testing a cellular telephone

摘要

A low-loss RF coupler for testing a cellular telephone through the antenna mount has a base with a hole large enough to fit over said antenna mount and a ground plane extending over a surface of the base. The hole has a contact portion which is electrically isolated from the ground plane by an airgap. A pair of transmission lines is provided, one having a signal portion electrically connected from the contact portion to the test equipment and the other having a ground portion electrically connected from the ground plane to the test equipment.