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HMCSIW double-band-pass filter loaded with L-shaped branch line

A dual-band-pass filter and branch technology, applied in the microwave field, can solve the problems of high processing cost and complex filter structure, and achieve the effects of simple processing, optimized out-of-band suppression performance, and novel structure

Active Publication Date: 2021-11-05
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The acquisition of the transmission zero point is realized by the coupling of the source and the load or the cross-coupling between non-adjacent resonators. Complicated or too expensive to process

Method used

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  • HMCSIW double-band-pass filter loaded with L-shaped branch line
  • HMCSIW double-band-pass filter loaded with L-shaped branch line
  • HMCSIW double-band-pass filter loaded with L-shaped branch line

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Embodiment 1

[0032] Using HFSS to model and simulate the structure designed above, Figure 4 Described is the S-parameter simulation result of the HMCSIW dual passband filter. Due to the introduction of the L-shaped stub line, a transmission zero point is generated at the position of 11.45GHz in the original mother passband, which is divided into two sub-passbands. At the same time, the five resonance points in the mother filter are allocated to the two sub-passbands. In the band, the first passband has three resonance points, and the second passband has two resonance points. The first passband of the dual-passband filter designed in this experiment ranges from 8.08GHz to 10.54GHz, and the center frequency is 9.4GHz, the relative bandwidth is about 26.2%, the second passband ranges from 12.1GHz to 13.6GHz, the center frequency is 12.8GHz, the relative bandwidth is about 11.7%. The return loss of the two passbands is better than 12dB, the insertion loss is better than 1.5dB, and the perfor...

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Abstract

The invention relates to an HMCSIW double-band-pass filter loaded with L-shaped branch lines, which takes an HMCSIW as a basic transmission line and comprises a dielectric substrate, a top metal layer arranged on the upper surface of the dielectric substrate and a bottom metal layer arranged on the lower surface of the dielectric substrate, and a plurality of U-shaped slots are etched on the top metal layer of the dielectric substrate, so that a broadband mother filter is realized; two L-shaped branch lines are loaded on the wide side of the top metal layer, the distance between the two L-shaped branch lines is used for generating a transmission zero point, two sets of gradually-changed rectangular grooves are etched in the bottom metal layer of the dielectric substrate and are divided into transition areas located at an input port and an output port, and the stop-band bandwidth is widened. Three U gaps are introduced into the upper surface of the HMCSIW to realize a broadband mother filter, a source and a load are coupled through two L-shaped branch lines, a transmission zero point is generated, a mother passband is split into two sub passbands, and finally the dual-passband filter is constructed.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to an HMCSIW double-bandpass filter loaded with L-shaped stub lines, in particular to a double-passband filter coupled with a source and a load. Background technique [0002] The continuous development of modern communication technology has put forward higher and higher requirements for various indicators of communication circuits. Traditional microwave circuits such as rectangular waveguides and microstrip lines have been difficult to meet people's expectations for future new microwave circuits. Therefore, research on high transmission performance, New microwave circuits with simple structure and compact size are of great interest. SIW (Substrate Integrated Waveguide), as a new type of waveguide structure, has been widely used in microwave circuits in recent years, but because it requires metal drilling, when the diameter of the metal hole is small, the processing is...

Claims

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Application Information

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IPC IPC(8): H01P1/205
CPCH01P1/205
Inventor 许锋张笑
Owner NANJING UNIV OF POSTS & TELECOMM
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