| 摘要 |
The present invention relates to a frequency combiner and an antenna using a saw filter of a global positioning system antenna. The frequency and the antenna comprise: a plurality of antennas for receiving a 1227-MHz L1 frequency signal having a phase of 0°, 90°, 180°, and 270°, in which position information of a terminal is contained, from a satellite; and an L1 frequency receiving unit for receiving the L1 frequency signal from the satellite through the plurality of antennas; and a plurality of antennas for receiving a 1575-MHz L2 frequency signal having a phase of 0°, 90°, 180°, and 270°, in which position information of the terminal is contained, from the satellite, and an L2 frequency receiving unit for receiving the L2 frequency signal. The L1 frequency receiving unit and the L2 frequency receiving unit are simultaneously mounted on a PCB substrate in a multi-layer substrate structure. When the global positioning system antenna receives a signal from the satellite, a method of combining different frequencies by using two saw filters is provided so that two types of signals, that is, L1 and L2, are combined into a single signal in an antenna that applies the L1 and L2 frequencies to the same PCB substrate. The influence on respective lines is prevented by using an LC phase shifter that makes the opposite frequency open after impedance matching of the saw filter. [Reference numerals] (84,86) Saw filter for 1575 MHz; (91,AA,81,BB) Combiner; (92,82) Hybrid coupler; (94,96) Saw filter for 1227 MHz; (97,87) Phase shifter; (CC) Output terminal |
