Multi-antenna structure

摘要

A multi-antenna structure includes a base plate, a first antenna, a second antenna, a first metal line, and a second metal line. The base plate includes a grounded metal surface. The grounded metal surface includes two short sides and two long sides. The first antenna and the second antenna are arranged on the base plate. The first metal line and the second metal line are electrically connected to the two short sides of the grounded metal surface. A current path of the two short sides is prolonged because of the first metal line and the second metal line. A longitudinal current is equal to a transverse current at a low frequency. A current of the first antenna and a current of the second antenna does not interfere each other. Isolation between the first antenna and the second antenna is improved.

主权项

1. A multi-antenna structure including:
a base plate having a grounded metal surface, the grounded metal surface having two short sides and two long sides; a first antenna arranged on the base plate and arranged on one of the short sides; a second antenna arranged on the base plate and arranged on the other short side; a first metal line electrically connected to one of the short sides; and a second metal line electrically connected to the other short side, wherein a current path of the two short sides is prolonged because of the first metal line and the second metal line; a longitudinal current is equal to a transverse current at a low frequency; whereby a current of the first antenna and a current of the second antenna does not interfere each other; isolation between the first antenna and the second antenna is improved; wherein the base plate is a printed circuit board; the base plate includes a first signal feed line and a second signal feed line; the two short sides of the base plate are an upper short side and a lower short side: the two long sides of the base plate are a right long side and a left long side; wherein the first antenna includes a first rack; the first rack includes a first radiator having a plurality of metal lines; the first radiator is electrically connected to the first signal feed line; the first signal feed line is electrically connected to a coaxial cable; wherein the second antenna includes a second rack; the sewn rack includes a second radiator having a plurality of metal lines; the second radiator is electrically connected to the second signal feed line; the second signal feed line is electrically connected to a coaxial cable; wherein the first metal line is electrically connected to the upper short side of the grounded metal surface and is reeled on the first rack of the first antenna or is pasted on a casing of an electronic device; wherein a length of the first metal line plus a length of the upper short side of the grounded metal surface is between one-half and one-eighth wavelength of a center frequency of the low frequency.