Triplexer circuit of three mode terminal

Abstract

The present invention relates to a triplexer circuit of three mode terminal for separating signal received via antenna into three frequency bonds (a first, second, third frequency bond), comprising a fist syntony section having an end connected to antenna (Ant) for filtering signal in other frequency bonds except the first frequency bond; a second syntony section connected to the other end of the first syntony section for only allowing the first frequency bond; a third, fifth syntony section parallelly connecting to above antenna with the first syntony section for filtering signal in other frequency bonds except the second frequency bond; a fourth, sixth syntony section connecting to between the third, fifth syntony sections and the other end of the fifth syntony section for only allowing the second frequency bond; an inductor and a filter (SaW), wherein the inductor and said third syntony section are parallel connection on the antenna, the filter is parallelly connected on the other end of the inductor for separating the third frequency bond signal.

Description

technical field [0001] The invention relates to a triplexer circuit of a three-mode terminal, especially in a three-mode terminal that simultaneously processes multiple modes such as CDMA (Code Division Multiple Access), GPS, and US-PCS (Personal Communication System), without using an independent filter , but combine multiple passive (Passive) components to improve insertion loss and isolation characteristics, so that the three-mode terminal triplexer circuit that can effectively separate signals between frequency bands. Background technique [0002] Conventional dual-band terminals have a duplexer that can receive and separate two different frequency bands (CDMA, PCS) with one antenna, and can process signals with two frequency bands together. But recently, it has begun to add GPS (Global Position System) function to the original dual-frequency terminal, adopting the ability to separate three frequency bands (US-PCS: 1850-1990MHz (F1), GPS: 1570-1580MHz (F2), CDMA: 824MHz...

AI Technical Summary

Problems solved by technology

[0006] However, as mentioned above, as the number of modes that must be implemented in the terminal increases, the frequency spacing between the modes becomes closer and closer, making it difficult to make a separate filter for filtering multiple signals at the same time

Moreover, for GPS and US-PCS, the frequency interval is nearly 300MHz, and it is difficult to make duplexers and triplexers required for signal separation

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