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Stripline filter

A filter and stripline technology, applied to waveguide devices, circuits, electrical components, etc., can solve problems such as inability to obtain filter characteristics, increased filter insertion loss, and increased resistance of resonant lines

Inactive Publication Date: 2010-09-22
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to meet the conditions of the relative frequency bandwidth, the characteristic impedance can be considered to be adjusted. However, the adjustment of the characteristic impedance will change the filter characteristics such as pass characteristics and reflection characteristics, and often cannot obtain the desired filter characteristics.
For example, reducing the line width of each resonant line and increasing the characteristic impedance will increase the resistance of the resonant line and increase the insertion loss of the filter, and it will not be possible to obtain good pass characteristics.

Method used

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Examples

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Embodiment Construction

[0034] Hereinafter, a configuration example of the stripline filter according to the first embodiment will be described.

[0035] The stripline filter shown here is a bandpass filter. This filter is used for UWB (Ultra Wide Band: Ultra Wide Band) communication corresponding to a high frequency band of 4 GHz or higher.

[0036] figure 1 is an exploded perspective view of the upper surface side of the stripline filter. figure 2 is a perspective view of the lower surface side of the stripline filter.

[0037] The stripline filter 1 has a rectangular plate-shaped dielectric substrate 10 and laminated glass layers 2 and 3 . Here, the laminated glass layers 2 , 3 each have a thickness of approximately 15 μm. The laminated glass layers 2 and 3 are laminated on the upper surface of the dielectric substrate 10, and contribute to mechanical protection of the stripline filter 1, improvement of environmental resistance, and the like. The laminated glass layer 2 is provided with a h...

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Abstract

A stripline filter (1) comprises a ground electrode (17), input / output electrodes (18A and 18B), upper face resonance lines (13A to 13E), side face resonance lines (12A to 12D), side face line portions (14A and 14B), connecting electrode portions (15A and 15B), and upper face line portions (16A and 16B). The ground electrode (17) is provided only on the lower surface of a dielectric substrate (10). The input / output electrodes (18A and 18B) are provided on the lower surface of the substrate (10), being away from the ground electrode (17). The upper face resonance lines (13A to 13E) are provided on the upper surface of the substrate (10). The side face line portions (14A and 14B), the connecting electrode portions (15A and 15B), and the upper face line portions (16A and 16B) bring the upper face resonance lines (13A and 13E) and the input / output electrodes (18A and 18B) into conduction. The upper face resonance lines (13A and 13E) each have a line width narrower than that of each of the upper face resonance lines (13B to 13D).

Description

technical field [0001] The present invention relates to a stripline filter provided with a stripline on a dielectric substrate. Background technique [0002] For filters used in communication systems such as UWB (Ultra Wide Band) communication that uses a very wide frequency band at high frequencies, the filter characteristics of a wide frequency band are obtained. The relative bandwidth of the filter depends on the strength of the electromagnetic field coupling between the resonators and the strength of the external coupling. Therefore, a stripline filter with wide-band filtering characteristics is sometimes used. By directly connecting the resonance line of the resonator constituting the input and output stages to the input and output electrodes with electrodes to perform tap coupling, a strong external coupling, and cross-coupling each resonator (for example, refer to Patent Document 1). [0003] In Patent Document 1 Figure 5 It describes the features of alternately ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P1/205
CPCH01P1/20327H01P1/20381
Inventor 竹井泰范辻口达也本田修祥
Owner MURATA MFG CO LTD