Patent ID: 7876175
Filing Date: 2011-01-25
Classification: H03H

Abstract:
1. A diplexer for receiving and transmitting a first bandwidth signal corresponding to a first central frequency and a second bandwidth signal corresponding to a second central frequency, the diplexer comprising: a first signal end; a second signal end; a third signal end for receiving or transmitting the first bandwidth signal and the second bandwidth signal; a first impedance unit comprising a first end coupled to the first signal end, and a second end, the first impedance unit forming an impedance match with a third impedance unit coupled to the third signal end when the third signal end receives or transmits the first bandwidth signal, and forming a high impedance unit when the third signal end receives or transmits the second bandwidth signal; a second impedance unit comprising a first end coupled to the second signal end, and a second end, the second impedance unit forming an impedance match with the third impedance unit when the third signal end receives or transmits the second bandwidth signal, and forming a high impedance unit when the third signal end receives or transmits the first bandwidth signal; and the third impedance unit comprising a first end coupled to the third signal end, and a second end coupled to the second end of the first impedance unit and the second end of the second impedance unit; wherein the first impedance unit comprises: wherein a length of the first signal transmission line and a length of the second signal transmission line correspond to a quarter of a wavelength corresponding to the second central frequency.