Dual antenna, single feed system

摘要

An antenna system includes a low-band antenna configured for low-band frequencies and a high-band antenna configured for high-band frequencies. The low-band antenna is configured so that high-band frequencies have a high impedance while the high-band antenna is configured so that low-band frequencies have a high impedance. A transmission line can be used to couple both antennas together and the transmission line can be used to add phase delay to the impedance of the low-band and high-band antennas so that the corresponding frequencies that the antennas are not configured for are shifted toward an infinite impedance point on a Smith chart.

主权项

1. An antenna system, comprising:
a first antenna configured to resonate in a low frequency band, the first antenna being indirectly fed; and a second antenna configured to resonate in a high frequency band, the second antenna being indirectly fed, wherein are both the first and second antenna are fed by a transmission line extending therebetween, the first antenna configured to provide a high impedance to high-band frequency input and the second antenna configured to provide a high impedance to a low-band frequency input, wherein the second antenna includes a slot with an electrical length and a capacitor configured to increase the electrical length of the slot.