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Physics Maths Engineering

Design of CRLH-TL BPF with controllable attenuation poles

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Atsuya Hirayama,

Atsuya Hirayama


Hinata Ishikawa,

Hinata Ishikawa


Takanobu Ohno

Takanobu Ohno


  Peer Reviewed

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© attribution CC-BY

  • 0

rating
406 Views

Added on

2024-12-25

Doi: https://doi.org/10.1186/s43067-024-00154-0

Related Subjects
Physics
Math
Chemistry
Computer science
Engineering
Earth science
Biology

Abstract

AbstractCompact and pole-controllable resonators and bandpass filter (BPF) using a composite right/left-handed transmission line (CRLH-TL) are designed in this study. The distributed constant line in the CRLH-TL has applied a tap-coupling technique, and one tap-coupled stub is loaded with the left-handed (LH) circuit. Attenuation poles are generated when the input susceptance of the stub diverges. In the tap-coupled CRLH-TL resonator, the attenuation pole is controlled at either the desired lower or higher region frequency than a resonant frequency by adjusting the circuit parameters. Also, the BPF constructed by the CRLH-TL resonators is designed based on a filter design theory, where the attenuation poles are located at lower and higher region frequencies than a negative-first-order frequency. The BPF with microstrip structure is fabricated using MEGTRON6 R-5775 ($$\varepsilon _\text {r}$$ ε r : 3.7, h: 0.63 mm, t: 18 μm), chip capacitors, and wire inductors. The simulated results show that the desired characteristics are approximately satisfied, i.e., we can design the CRLH-TL BPF which is controllable for the attenuation poles at both lower and higher region frequencies than a resonant frequency. The measured results are good agreement with the simulation. The negative-first-order frequency is generated at 2.00 GHz with 133 MHz bandwidth, i.e., the fractional bandwidth is 6.65 %. The resonator lengths in the BPF are shortened by 81.5 % and 75.0 % in comparison with a conventional half-wavelength ($$\lambda /2$$ λ / 2 ) openstub, and the size of the fabricated BPF is 0.18 $$\lambda _\text {g} \times$$ λ g × 0.17 $$\lambda _\text {g}$$ λ g . Therefore, a compact BPF with two controllable attenuation poles is realized by the tap-coupled CRLH-TL.

Key Questions

What is the objective of the study?

The study designs a composite right/left-handed transmission line (CRLH-TL) bandpass filter (BPF) with controllable attenuation poles, aiming to create a compact filter with optimized performance.

How are attenuation poles controlled in the design?

Attenuation poles are controlled by adjusting the parameters of the tap-coupled CRLH-TL resonator, which allows precise placement of poles at desired frequencies.

What are the practical applications of this research?

The research can be applied in RF circuits, particularly for creating miniaturized and efficient filters used in communication systems, where space and performance are critical.

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ARTICLE USAGE


Article usage: Dec-2024 to May-2025
Show by month Manuscript Video Summary
2025 May 118 118
2025 April 68 68
2025 March 76 76
2025 February 52 52
2025 January 76 76
2024 December 16 16
Total 406 406
Show by month Manuscript Video Summary
2025 May 118 118
2025 April 68 68
2025 March 76 76
2025 February 52 52
2025 January 76 76
2024 December 16 16
Total 406 406
Related Subjects
Physics
Math
Chemistry
Computer science
Engineering
Earth science
Biology
copyright icon

© attribution CC-BY

  • 0

rating
406 Views

Added on

2024-12-25

Doi: https://doi.org/10.1186/s43067-024-00154-0

Related Subjects
Physics
Math
Chemistry
Computer science
Engineering
Earth science
Biology

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