a bandpass filter

A band-pass filter and band-pass filtering technology, applied in one-way transmission network, electrical components, multi-terminal pair network, etc., can solve the problems of large ripple and high insertion loss, achieve flat frequency response curve, reduce insertion loss, The effect of widening the passband width

Active Publication Date: 2020-08-28
RDA MICROELECTRONICS TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This reflects larger ripple in the passband and higher insertion loss

Method used

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Examples

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Embodiment Construction

[0044] see Figure 5 , which is Embodiment 1 of the bandpass filter provided by the present application. The first embodiment includes two filter units cascaded between the input end and the output end of the filter, which are respectively a high-pass filter unit and a band-pass filter unit. The cut-off frequency of the high-pass filter unit is lower than the lower limit cut-off frequency of the band-pass filter unit. Wherein, the order of cascaded filter units can be adjusted arbitrarily.

[0045] Figure 6a An implementation circuit of the first embodiment is given, which adopts a ladder topology, including only one series arm and four parallel arms.

[0046] The high-pass filter unit includes a series section and two parallel arms. There is a series resonator S1 on the series section, and its two ends are called node A and node B respectively. Parallel arm one includes an inductor L1, one end of which is connected to node A, and the other end is grounded. The second p...

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Abstract

The invention discloses a bandpass filter. At least one bandpass filter unit and at least one high-pass filter unit are arranged between the input end and the output end of the filter, and the filter units are cascaded randomly; and a cut-off frequency of the high-pass filter unit is less than a lower limit cut-off frequency of a front bandpass filter unit and a back bandpass filter unit. The bandpass filter function is realized through an outband suppression characteristic of the bandpass filter unit, and the passband width of the bandpass filter unit is increased, thereby making the passband wider but resulting in dip in a frequency response curve in the passband. The frequency response curve in the passband is smoothed through the high-pass filter unit, so that dual effects of broad passband, fewer waves in the passband and low insertion loss are realized.

Description

technical field [0001] The present application relates to a bandpass filter. Background technique [0002] Mobile terminals represented by mobile phones need to work in multiple wireless frequency bands at the same time, including multiple working frequency bands of mobile communication networks such as 2G, 3G, 4G, etc., multiple working frequency bands of wireless local area network (WLAN), Bluetooth (Bluetooth) and / or multiple operating frequency bands of wireless communication protocols such as ZigBee, multiple operating frequency bands for receiving satellite positioning signals such as GPS, etc. This requires a radio frequency filter to be installed inside the mobile terminal to allow the signal of the required frequency to pass and block the unwanted frequency. Filters are usually specific to frequency bands. To support more operating frequency bands, more filters or duplexers need to be added to the mobile terminal. Now a mobile phone often has at least 30 to 40 RF ...

Claims

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Application Information

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IPC IPC(8): H03H11/38H03H11/34
CPCH03H11/34H03H11/38
Inventor 韩茜茜彭彦豪宋博胡念楚贾斌
Owner RDA MICROELECTRONICS TECH SHANGHAI CO LTD
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