Flexible bandpass filter on polyimide substrate

Gong, Jun-Shuai; Wang, Zhiliang; Qu, Huiwen; Cang, Dingyong

doi:10.1007/s10854-021-06968-2

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…The proposed fabrication process is suitable for all types of substrates, especially those not resistant to high temperatures and chemicals. When compared, for example, to a very recently published paper 22 that proposes a flexible bandpass filter on polyimide substrate (tanδ =0.001) one can note that the insertion loss measured (0.83 dB) are somewhat better than those measured for our solution (1.2 dB). But, our proposal is based on a bio-substrate with higher losses (tanδ = 0.02, i.e., 20 times greater).…”

Section: Simulation and Measurement Resultsmentioning

confidence: 64%

“…We can find in literature flexible bandpass filters fabricated on polymer substrates using self-metallization technique 15,22 and photolithography with chemical etching 23,24 but compared to our work, the substrate used is not biosourced. We can also find flexible filters fabricated on paper substrates 25 using photolithography combined with chemical etching and another sacrificial substrate, but then the issue of hydrophobicity arises.…”

Section: Simulation and Measurement Resultsmentioning

confidence: 81%

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2.45 GHz natural polymer‐based flexible bandpass filter exploiting laser structuring

Sid

Cresson

Joly

et al. 2022

Micro & Optical Tech Letters

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This article presents the realization of a bandpass filter on a flexible biopolymer substrate with a suitable fabrication process. We used copper adhesive tape and laser structuring to fabricate the filter based on a quasi-lumped microstrip structure. The filter characteristics are a central frequency of 2.45 GHz, a bandwidth of 20%, and insertion loss of 1.2 dB. It is demonstrated that the filter's performance remains almost constant under different bending, folding, and rolling conditions. The results show that the proposed bio-sourced polymer is a good candidate for flexible green electronics and wearable applications.

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Section: Simulation and Measurement Resultsmentioning

confidence: 64%

Section: Simulation and Measurement Resultsmentioning

confidence: 81%

2.45 GHz natural polymer‐based flexible bandpass filter exploiting laser structuring

Sid

Cresson

Joly

et al. 2022

Micro & Optical Tech Letters

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show abstract

“…Among polymer substrates, polyimide (PI) has outstanding comprehensive properties, including high-temperature resistance, excellent mechanical strength and flexibility, high radiation and wear stability. Therefore, the PI substrate has been widely used in flexible bandpass filters of wireless communications [ 1 , 2 ], thin-film transistors of flexible organic light-emitting diodes (OLEDs) [ 3 , 4 ], solar cells [ 5 ] etc. [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

The Pivotal Role of Benzimidazole in Improving the Thermal and Dielectric Performance of Upilex-Type Polyimide

Lian

Zhao

et al. 2023

Polymers

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Polyimide (PI) with ultra-high thermal resistance and stability is essential for application as a flexible substrate in electronic devices. Here, the Upilex-type polyimides, which contained flexibly “twisted” 4,4′-oxydianiline (ODA), have achieved various performance improvements via copolymerization with a diamine containing benzimidazole structure. With the rigid benzimidazole-based diamine bearing conjugated heterocyclic moieties and hydrogen bond donors fused into the PI backbone, the benzimidazole-containing PI showed outstanding thermal, mechanical, and dielectric performance. Specifically, the PI containing 50% bis-benzimidazole diamine achieved a 5% decomposition temperature at 554 °C, an excellent high glass transition temperature of 448 °C, and a coefficient of thermal expansion lowered to 16.1 ppm/K. Meanwhile, the tensile strength and modulus of the PI films containing 50% mono-benzimidazole diamine increased to 148.6 MPa and 4.1 GPa, respectively. Due to the synergistic effect of rigid benzimidazole and hinged, flexible ODA, all PI films exhibited an elongation at break above 4.3%. The electrical insulation of the PI films was also improved with a dielectric constant lowered to 1.29. In summary, with appropriate mixing of rigid and flexible moieties in the PI backbone, all the PI films showed superior thermal stability, excellent flexibility, and acceptable electrical insulation.

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Soft radio frequency microstrip bandpass filter: Precise design and demonstration

He,

Zhao,

Chen

et al. 2023

AIP Advances

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A soft and tunable microwave bandpass Chebyshev microstrip end-coupled filter is demonstrated on a polydimethylsiloxane substrate based on high electrically conductive composites made of silver nanoparticle-covered flakes, even with large strain. To achieve a precise design, key microwave parameters such as the impedance, S-parameters, and transmission matrix are defined as a function of strain. This strain vector polar coordinate is used to represent the relationship between the type and the performance of a filter. Then, the most important Chebyshev or quasi-Chebyshev type of filter can be accurately realized by looking up its polar coordinates to find the corresponding strain magnitude and direction of stretching. An end-coupled Chebyshev microstrip bandpass filter with a center frequency of 12.8 GHz and bandwidth of 22% was designed and fabricated for demonstration. Experimentally, at a lateral elongation of 8% and 10.7%, the center frequency decreases by 0.61 and 0.88 dB, respectively, matching the simulation results very well. One potential application for this tunable filter is a front-end module mounted on the biomimetic robot driven by its mechanic movements.

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Flexible bandpass filter on polyimide substrate

Cited by 3 publications

References 26 publications

2.45 GHz natural polymer‐based flexible bandpass filter exploiting laser structuring

2.45 GHz natural polymer‐based flexible bandpass filter exploiting laser structuring

The Pivotal Role of Benzimidazole in Improving the Thermal and Dielectric Performance of Upilex-Type Polyimide

Soft radio frequency microstrip bandpass filter: Precise design and demonstration

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