Patent ID: 7190970
Filing Date: 2007-03-13
Classification: H03H,H04B,H05K

Abstract:
1. A multiplexer comprising: a first filter that passes a signal in a first frequency band and attenuates a signal in a second and a third frequency bands; a second filter that passes a signal in the second frequency band and attenuates a signal in the first and third frequency bands; a third filter that passes a signal in the third frequency band and attenuates a signal in the first and second frequency bands; and a multilayer substrate; wherein the first filter is a lowpass filter, the second filter is a bandpass filter, the third filter is a highpass filter, and one of two input/output ports of each of the first, second and third filters is connected together with a common port; at least one element of the first and third filters is disposed on a mounting surface of the multilayer substrate; the remaining elements of the first and third filters are disposed on at least one interior layer of the multilayer substrate; and the second filter includes a SAW filter disposed on the mounting surface of the multilayer substrate.