| 摘要 |
Disclosed is a filtering device, which relates to the technical field of mobile communications, and solves the problems of large insertion loss and poor far-end rejection performance of the existing filters. In the filtering device provided in the embodiments of the present invention, a pass band of a first stage of units which is composed of at least three coaxial filters covers a pass band of a second stage of units which is composed of at least three dielectric filters, and the bandwidth of the first stage of units is twice as large as that of the second stage of units, so that when the coaxial filters are coupled to the dielectric filters, the insertion loss of the coaxial filters is reduced, thereby reducing the overall insertion loss of the filtering device. By making the transmission zero point of the first stage of units be located at the secondary harmonic frequency point of the second stage of units, the filtering device can have high rejection of the secondary harmonic, thereby obtaining better far-end rejection performance. The filtering device provided in the embodiments of the present invention is mainly used as a duplexer of a transceiver module of a base station. |
