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A Bandpass Filter with Adjustable Center Frequency

A band-pass filter and center frequency technology, which is applied to waveguide devices, resonators, electrical components, etc., can solve the problems of complex manufacturing process and inability to miniaturize the filter, and achieve miniaturized size, simple manufacturing process, and high precision high effect

Active Publication Date: 2017-04-26
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The main purpose of the present invention is to propose a band-pass filter with an adjustable center frequency to solve the technical problem in the prior art that the process is complicated and the filter cannot be miniaturized due to the need to add additional components to realize the adjustable center frequency.

Method used

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  • A Bandpass Filter with Adjustable Center Frequency
  • A Bandpass Filter with Adjustable Center Frequency
  • A Bandpass Filter with Adjustable Center Frequency

Examples

Experimental program
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Effect test

Embodiment 1

[0033] This embodiment provides a figure 2 center frequency adjustable band-pass filter shown in reference figure 1 , in the bandpass filter of this embodiment, the adjustable electrode 20 is arranged on the upper surface 10a, and, in order to make the manufacturing process simpler, the adjustable electrode 20 avoids the upper layer ground electrode 14a and is electrically connected to the upper layer resonator 15a. During fabrication, a marking point M may be set on the upper surface 10a to facilitate the correct fabrication of the adjustable electrode 20 on the upper surface 10a.

[0034] In this embodiment, both the upper-layer resonator 15a and the lower-layer resonator 15b include five sub-resonators, each sub-resonator on the upper layer has a certain overlapping area with the corresponding lower-layer sub-resonator, forming five capacitors C11-C15, refer to figure 1 and Figure 4 , correspondingly, the adjustable electrode 20 on the upper surface 10a also includes ...

Embodiment 2

[0040] The difference between the bandpass filter provided in this embodiment and Embodiment 1 is that the adjustable electrode 20 avoids the upper ground electrode 14a and the upper resonator 15a and is electrically connected to the lower resonator 15b. The method of avoiding can be: open holes on the upper ground electrode 14a and the upper resonator 15a, the size of the hole is greater than the size of the metal conductor 30 so that the metal conductor 30 will not contact the upper ground electrode 14a and the upper resonator 15a. The shape of the adjustable electrode 20 can also be as Figure 5 For the petal shape shown, the operation for adjusting the center frequency is the same as that of Embodiment 1.

Embodiment 3

[0042] The difference between the bandpass filter provided in this embodiment and Embodiment 1 is that the adjustable electrode 20 is located on the lower surface 10b of the ceramic substrate 10, and avoids the lower ground electrode 14b and the intermediate coupling layer 16 to realize the electrical connection with the lower resonator 15b. connect.

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Abstract

The invention discloses a band-pass filter with the center frequency adjustable. The band-pass filter comprises a ceramic base body which comprises an upper surface and a lower surface, and an upper layer grounding electrode, an upper layer resonator, a lower layer resonator, a cross coupling layer and a lower layer grounding electrode are sequentially arranged inside the ceramic base body from top to bottom; adjustable electrodes are arranged on the upper surface and / or the lower surface and electrically connected with the upper layer resonator or the lower layer resonator, moreover, the adjustable electrodes are insulated from the upper layer grounding electrode, the lower layer grounding electrode and the cross coupling layer, and the center frequency of the band-pass filter is adjusted by changing the area of the adjustable electrodes. The band-pass filter is simple in manufacturing process, the operation of adjusting the center frequency is convenient and high in precision, the yield level of an LTCC filter with the high precision requirement can be greatly improved, and the band-pass filter can be miniature due to the fact that no extra element needs to be introduced.

Description

technical field [0001] The invention relates to a band-pass filter with adjustable center frequency, in particular to a small-sized monolithic band-pass filter with adjustable center frequency made by LTCC technology, which can be applied to applications requiring high frequency selectivity. radar system. Background technique [0002] At present, the filter circuit in the radar system has very high requirements on the filter. It must not only ensure a sufficiently low insertion loss at the passband frequency, but also have a sufficiently large suppression at the edge of the passband, as well as reliability such as temperature stability. At the same time, the size should be small enough to accommodate a large number of other filters and other components of different frequency bands on the circuit board. [0003] The existing filter types mainly include LTCC (Low Temperature Co-fired Ceramic, low temperature co-fired ceramic) filter, SAW (surface acoustic wave) filter, cavity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203H01P7/08
Inventor 刘宁漆珂包承育伍隽
Owner SHENZHEN SUNLORD ELECTRONICS