Micro-strip filter applied to radio frequency front end module of mobile device
A microstrip filter and RF front-end technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problems of reducing filter area, increasing filter bandwidth, etc., to achieve the effect of reducing area, reducing cost, and facilitating integration
Active Publication Date: 2014-02-26
北京昂瑞微电子技术股份有限公司
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[0004] The present invention provides a microstrip filter applied to a radio frequency front-end module of a mobile device, so as to solve the contradiction between increasing the bandwidth of the filter and reducing the area of the filter existing in the prior art
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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] This embodiment is a novel solution for forming a broadband filter by using a structure in which a coupled microstrip line is connected to an open circuit microstrip line, such as Figure 4 As shown, the left side is a schematic diagram of the circuit structure, which is composed of parallel coupled microstrip lines and open circuit microstrip lines. By using the three resonance points generated by parallel coupled microstrip lines and open circuit microstrip lines, and aiming at the microstrip line Width, line length and line spacing are optimized to achieve filtering functions in a wide frequency band. For mobile devices, especially for mobile phones, the application frequency band is mainly concentrated in 800MHz~2.3GHz, so for the harmonic signals outside the working frequency band (mainly 2f0~5f0 harmonic signals, harmonic...
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The invention relates to the correlative technical field of filters, in particular a micro-strip filter applied to a radio frequency front end module of a mobile device. The micro-strip filter comprises a first parallel coupling micro-strip line, a second parallel coupling micro-strip line and an open circuit micro-strip line. The first parallel coupling micro-strip line and the second parallel coupling micro-strip line are mutually connected and then are connected with the open circuit micro-strip line. According to the micro-strip filter applied to the radio frequency front end module of the mobile device, disclosed by the invention, a broadband filter is formed by connecting the parallel coupling micro-strip lines and the open circuit micro-strip line, the filter has the performances of simple circuit structure, small area, capability of realizing broad band and the like; and in particular for the radio frequency front end module originally needing to a substrate, the micro-strip filter arranged on the substrate is used for replacing a required lumped element filter, thus the cost is reduced on the premise of reducing area, and the influence on filtration performances due to the change of parameters of a lumped element is avoided.
Description
technical field [0001] The invention relates to the technical field of filters, in particular to a microstrip filter applied to a radio frequency front-end module of a mobile device. Background technique [0002] A filter is a device used to separate signals of different frequencies. Its main function is to pass signals of a certain frequency and block signals of other frequencies. In the radio frequency circuit system, the performance of the filter directly restricts the performance of the entire radio frequency system. A high-performance filter requires a small attenuation in the passband and a large attenuation in the cutoff region, and the passband to the cutoff The jump in the region should be as steep as possible; to achieve the characteristics of a steep sideband jump, it is often achieved by increasing the number of filter sections, but the increase in the number of filter sections will significantly increase the loss, so that the attenuation in the passband increa...
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IPC IPC(8): H01P1/212
Inventor 彭凤雄
Owner 北京昂瑞微电子技术股份有限公司