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A radio frequency low-pass filter applied to LTE

A low-pass filter and filter technology, applied in the direction of impedance network, electrical components, multi-terminal pair network, etc., can solve the problem that the filter is not suitable for radio frequency active circuits, etc., and achieve good in-band flatness, small occupied area, The effect of cost flexibility and multi-purpose

Active Publication Date: 2015-08-26
MOBILE ANTENNA TECH SHENZHEN +5
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a radio frequency low-pass filter applied to LTE, aiming to solve the technical problem that existing filters are not suitable for radio frequency active circuits

Method used

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  • A radio frequency low-pass filter applied to LTE
  • A radio frequency low-pass filter applied to LTE
  • A radio frequency low-pass filter applied to LTE

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0015] The embodiment of the present invention provides a radio frequency low-pass filter applied to LTE, which replaces the capacitor in the resonant circuit with an open-circuit microstrip, thereby ensuring the consistency of mass production of the product. During the working process of the radio frequency low-pass filter, the insertion loss in the passband is small, the standing wave is good, but the suppression of the stopband is strong, the performance is excellent, the cost is low, and it can be used flexibly.

[0016] figure 1 It is a structural diagram of the radio frequency low-pass filte...

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Abstract

The invention belongs to the field of wireless communication and particularly relates to a radio frequency low pass filter applied to long term evolution (LTE). The radio frequency low pass filter applied to LTE comprises a first filter inductor L3, a first resonant circuit 100, a second filter inductor L4 and a second resonant circuit 200 which are sequentially connected, all capacitors in the resonant circuits are replaced by open-circuited microstrips, two transmission zeros are correspondingly formed, the insertion loss in a passband is small, the standing wave is good, the inhibition to a stop band is high, the performance is good, the cost is low, and the radio frequency low pass filter is flexibly multipurpose.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a radio frequency low-pass filter applied to LTE. Background technique [0002] For high-speed, high-capacity wireless communications, the LTE (Long Term Evolution, Long Term Evolution) project is an evolution of 3G, and is also commonly called 3.9G. As the global standard of 3.9G, LTE improves and enhances the air access technology of 3G, has a data download capability of 100Mbps, and is regarded as the mainstream technology in the evolution from 3G to 4G. The personalization and miniaturization of wireless communication have put forward higher requirements for the use of filters in active circuits such as small size, high performance, and low price. [0003] The traditional small size and light weight filters mainly include the following types: microstrip filter, SAW (Surface Acoustic Wave, surface acoustic wave) filter and LC filter. Among them, the Q value of the micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/12
Inventor 姚兵兵周兴利林博文
Owner MOBILE ANTENNA TECH SHENZHEN
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