A duplex filter arrangement with leakage cancellation

A technology of duplex filter and filtering device, which is applied in the direction of duplex signal operation, transmission system, electrical components, etc., can solve problems such as expensive and complex FEM

Active Publication Date: 2020-10-30
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, discrete filter components are usually integrat

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  • A duplex filter arrangement with leakage cancellation
  • A duplex filter arrangement with leakage cancellation
  • A duplex filter arrangement with leakage cancellation

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Embodiment Construction

[0040] The following description is taken in conjunction with the accompanying drawings, which form a part of this description, and show by way of illustration specific aspects and examples in which the invention may be practiced. It is to be understood that other aspects may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description does not constitute any limitation, and the scope of the present invention is defined by the appended claims. Furthermore, it should be understood that the features of the various exemplary aspects described herein may be combined with each other unless specifically stated otherwise.

[0041] The purpose of this solution is to provide an improved duplex filter architecture, so as to obtain at least one of the following effects: reduce transmitter loss and receiver loss, reduce cost or size, and increase transceiver isolation.

[0042] Figure 1...

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Abstract

According to an aspect there is provided a duplex filter arrangement (100) for frequency-division duplex communication. The duplex filter arrangement (100) comprises a filtering arrangement that comprises filters (102) of a first type, a filter (104) of a second type and a filter (106) of a third type connecting a first radio frequency port (108), a second radio frequency port (110), a third radiofrequency port (112) and a fourth radio frequency port (114). The filters (102, 104, 106) are configured so that some of the filters are configured to pass signals at a first frequency band and reject signals at a second frequency band, and some of the filters are configured to reject signals at the first frequency band and pass signals at the second frequency band. Further, the filters (104, 106) of the second type and the third type are configured so that the phase response of the filter (104) of the second type differs at the first frequency band and at the second frequency band substantially 180 degrees from the phase response of the filter (106) of the third type. This enables implementing a duplex filter arrangement without using additional baluns that cause transmitter and receiverlosses.

Description

technical field [0001] This application relates to the field of duplex filters. More specifically, the present application relates to a duplex filter device with leakage cancellation function. Background technique [0002] Transceivers include both transmitters and receivers and are commonly used in various communication devices. The transceiver can operate in full duplex, that is, the receiver and transmitter operate simultaneously, while providing some means to prevent the transmitter from hiding the received signal. One way to achieve this is to assign different frequencies for transmission and reception. Therefore, this method is generally called frequency division duplex (FDD). [0003] Since different countries support different communication frequency bands, the number of FDD frequency bands that wireless devices need to support is huge and growing rapidly. Discrete duplex filter components support dozens of frequency bands, resulting in complex and costly solutio...

Claims

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Application Information

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IPC IPC(8): H04B1/525
CPCH04B1/0057H04B1/0067H04B1/525H04L5/14H04B1/006
Inventor 泰约·亨利·莱赫蒂宁
Owner HUAWEI TECH CO LTD
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