HYBRID ANTENNA FOR PORTABLE RADIO COMMUNICATION DEVICES

摘要

A hybrid antenna structure allows the antenna to be used internally or mostly internally in a portable radio communication device operating in the VHF range. The hybrid antenna structure includes a switching circuit that connects an RF circuit to one of several points along the length of a wrapped conductor element, depending on the selected operating frequency. An inductive matching tail element is adjustably tuned to match the selected tap point on the wrapped conductor for the selected operating frequency.

主权项

1. An internal antenna structure for a portable radio communication device, comprising:
a feed line connected to a radio frequency (RF) circuit; a switching circuit having an input connected to the feed line and having a plurality of selectable outputs, the switching circuit is operable to connect the input to a selected one of the plurality of selectable outputs; an inductive matching tail element connected between the feed line and a reference potential; and a wrapped conductor element having a plurality of tap points along a length of the wrapped conductor element; wherein each of the plurality of selectable outputs of the switching circuit is coupled exclusively to a respective one of the plurality of tap points.