RADIO MODEM ANTENNA EFFICIENCY IN ON BOARD DIAGNOSTIC DEVICE

摘要

An on board diagnostic (OBD) device having a radio modem is provided. An antenna of the radio modem is connected to a printed circuit board (PCB) housed within a plastic housing, where the PCB has a ground plane which is extended by a conductive extension. The conductive extension lengthens an effective length of a counterpoise of the antenna without necessitating an increase in size of the OBD device/plastic housing, resulting in maintaining a small form factor for the OBD device, while increasing antenna efficiency and/or bandwidth.

主权项

1. An apparatus, comprising:
a printed circuit board having a ground plane; a wireless transceiver comprising an antenna element operatively connected to the printed circuit board such that the ground plane defines a counterpoise for the antenna element, the counterpoise having an effective length; and an extension element, coupled to the ground plane in at least one of an electrical or mechanical manner, for extending the effective length of the counterpoise.