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Plane miniaturization communication band-pass filter with broadband external inhibition characteristic

A band-pass filter and filter technology, which is applied to waveguide devices, electrical components, circuits, etc., can solve the problem of electrical size reduction and achieve the effects of maintaining broadband out-of-band suppression, maintaining low loss, and small loss

Active Publication Date: 2012-07-25
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

According to the nature of the TEM transmission line, the resonant unit implemented by the substrate integrated coaxial line is only related to the working wavelength in one dimension; at the same time, due to the implementation of the dielectric substrate, the inner conductor of the transmission line is completely enclosed by the medium, and its electrical dimension will further increase. reduce

Method used

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  • Plane miniaturization communication band-pass filter with broadband external inhibition characteristic
  • Plane miniaturization communication band-pass filter with broadband external inhibition characteristic
  • Plane miniaturization communication band-pass filter with broadband external inhibition characteristic

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Embodiment 1

[0028] The filter structure is as figure 1 All dimensions shown are in mm. The size of the substrate in this embodiment is 19.8×24×1.13. The measured filter S-parameters and insertion loss results are shown in Figure 4 and Figure 5 .

[0029] The filter in this embodiment includes a filter part formed by using a substrate integrated coaxial line and a microstrip line for testing, and is realized by using three metal layers and two dielectric layers. The filter is composed of three quarter-wavelength substrate integrated coaxial resonators located in the middle metal layer. The resonators are directly coupled to the external input and output ports, and the coupling is coupled by adding isolation blind holes and changing the spacing between the resonators. The amount is controlled to achieve band-pass response and out-of-band rejection characteristics.

[0030] The center frequency of the filter in this embodiment is 2.35 GHz, and the corresponding insertion loss is 0.96...

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Abstract

The invention discloses a plane miniaturization communication band-pass filter with a broadband external inhibition characteristic. The band-pass filter with the broadband external inhibition characteristic is realized according to the structure of a plane substrate integrated coaxial line by adopting a quarter-wave resonator as a resonance unit through a partial coupling mode. The miniaturization band-pass filter which is low in loss, has the broadband external inhibition characteristic and can be integrated with a plane radio frequency microwave circuit is realized by the invention by aiming at the development requirements of plane integration and miniaturization wireless communication equipment. The miniaturization band-pass filter has the advantages that the structure is simple, the size is small, the requirement of plane circuit integration is met, the cost is low, the mass production is convenient and the like. Meanwhile, the filter has the broadband attenuation inhibition characteristic outside a passband.

Description

technical field [0001] The invention belongs to the field of comprehensive design of communication systems, and in particular relates to a band-pass filter with an out-of-band suppression function, low loss, plane integration and miniaturization. Background technique [0002] Radio frequency / microwave bandpass filters are an indispensable part of modern wireless communication systems. Their basic characteristics are to allow signals in specific frequency bands to pass while attenuating and suppressing signals in other frequency bands. According to the position of the RF / microwave bandpass filter in the transceiver channel of the communication system, its functions can be divided into the following: In the receiving channel, this type of filter is often located in the post-stage of the antenna or the post-stage of the low-noise amplifier, and is used to select the The signal in the frequency band filters out the noise and interference signals out of the band; in the transmiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
Inventor 张彦洪伟陈继新
Owner SOUTHEAST UNIV
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