摘要 |
A dual-band antenna arrangement comprises an antenna (102,104) c onnected to a first feed conductor (106a) for signals in a first frequency band, a second feed conductor (106b) for signals in a second frequency band and a ground conductor (108). First and second transmission lines are formed by the ground conductor and a respective one of the feed conductors, and each of the transmission lines has its length optimised to be used in conjunction with a respective complementary circuit element thereby enabling a good match to the antenna to be achieved in each of the frequency bands. In one embodiment the antenna is a PIFA, and the lengths of the transmission lines are optimised by the addition ofa linking conductor (910) between the feed and ground conductors, thereby enabling the use of larger shunt capacitances as the circuit elements, improving bandwidth and Q. |