| 摘要 |
A switchable antenna (10) with a base antenna assembly (11), a secondary antenna assembly (12) and a switch. Base and secondary antenna assemblies (11,12) have respective housings (21,23) to respectively house helical antennas (31,40). Secondary antenna assembly (12) is mounted to and operably coupled to base antenna assembly (11) with a connector (13). A contact member (18) of base antenna assembly (11) has a contact ball bearing (20) and a conductive plate (22). Secondary antenna assembly (12) has a contact member (19) with a conductive plate (25) and a dimple (26). The switch is formed by connector (13), ball bearing (20) and conductive plates (22,25) and selectively electrically couples adjacent ends (32,41) of helical antennas (31,40) by relative rotation about a common longitudinal axis (43).
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