Compact wearable 5‐GHz flexible filter

Zhao, Ming; Zhang, Yong

doi:10.1049/el.2017.0625

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…As seen in Table 1, the minimum insertion loss of the bandpass filter deteriorated by 0.01, 0.02, 0.02, and 0.02 dB separately after the bending, folding, rolling, and tape-exfoliation tests. The errors were mainly The flexible filters fabricated by other techniques in the literature [22][23][24] were usually only tested when the filter was bent. The flexible filters manufactured by surface modification and in situ self-metallization technology were tested under bending, folding, and rolling conditions.…”

Section: Characteristicsmentioning

confidence: 99%

Flexible Bandpass Filter Fabricated on Polyimide Substrate by Surface Modification and In Situ Self-Metallization Technique

Wang

Cang

2019

Polymers

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Polymer, especially polyimide (PI), is the best suitable substrate material for the design of flexible electronics. The compact silver can be reduced on the surface of PI films by surface modification and in situ self-metallization technique. The formed silver layers have good electrical and mechanical flexibility. A flexible bandpass filter on a PI flexible substrate by surface modification and in situ self-metallization technique at room temperature are presented in this work. Measured results show that the proposed flexible bandpass filter could achieve a fractional bandwidth of 80.8% with an insertion loss (IL) of less than 0.6 dB. The performance of the designed filter is almost constant under different bending, folding, and rolling conditions. The formed silver layers also present good adhesion with PI substrates. This technology provides an alternative approach for manufacturing flexible filters without high-temperature thermal annealing, costly equipment, and vacuum conditions.

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Section: Characteristicsmentioning

confidence: 99%

Flexible Bandpass Filter Fabricated on Polyimide Substrate by Surface Modification and In Situ Self-Metallization Technique

Wang

Cang

2019

Polymers

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“…The design of two four-pole, quasi-elliptic X-band bandpass filters with stacked openloop resonators on LCP substrates [17]. A compact flexible bandpass filter operating at 5.15-5.875 GHz is designed based on 0 • feed structure with 50 µm LCP substrate [18]. A 10 GHz stepped impedance low-pass filter and a 9.5GHz bandpass filter are produced on an LCP substrate [19].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Microstrip Low-Pass Filter Design Using Asymmetric Pi-Shaped DGS

et al. 2019

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This paper presents a flexible microstrip low-pass filter (LPF) fabricated on a polyimide film substrate. The proposed flexible microstrip LPF with ten cascaded asymmetrical Pi-shaped defected ground structure (DGS) resonators are designed, simulated, manufactured, and measured. The simulation and experiment results demonstrate that the designed flexible microstrip LPF has a very sharp transition band, an ultra-wide stop-band (SB) and high rejection in SB performance compared with the existed microstrip LPFs with symmetrical and asymmetrical DGS. The proposed flexible LPF with ten cascaded resonators is with a compact size of 100 mm × 2.6 mm × 0.254 mm, a very low insertion loss of less than 1.9 dB under 2.2 GHz, and a wide SB from 2.7 to 12 GHz with the rejection of larger than 50 dB. The proposed flexible LPF has the potential to be used in wireless terminals to replace the traditional RF coaxial cable because it is very thin and has good transmission and filtering functions.INDEX TERMS Defected ground structure (DGS), flexible printed circuit board (FPCB), low-pass filter (LPF), pi-shaped DGS, wireless communication.

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“…With adjustable permeability by magnetic fields, ferrite is also attractive for devices in the terahertz or optical range [9][10][11]. Since the liquid crystal (LC) is fluid, it is better used for volume devices, like waveguides [12], or flexible components, like wearable filters [13].…”

Section: Introductionmentioning

confidence: 99%

Design of a Liquid-Crystal-Tunable Terahertz Demultiplexer Based on a Metal-Insulator-Metal Waveguide

Feng

et al. 2019

Applied Sciences

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A tunable demultiplexer with three output channels infiltrated by liquid crystal (LC) is presented, which is based on a metal-insulator-metal (MIM) waveguide. The operating frequencies of the three output channels can be tuned simultaneously at will by changing the external bias electric field applied to the LC. By analyzing the Fabry-Pérot (FP) resonance modes of the finite-length MIM waveguide both theoretically and numerically, the locations of the three channels are delicately determined to achieve the best demultiplexing effects. Terahertz (THz) signals input from the main channel can be demultiplexed by channels 1, 2 and 3 at 0.7135 THz, 1.068 THz and 1.429 THz, respectively. By applying an external electric field to alter the tilt angle of the infiltrating LC material, the operating frequencies of channels 1, 2 and 3 can be relatively shifted up to 12.3%, 9.6% and 9.7%, respectively. The designed demultiplexer can not only provide a flexible means to demultiplex signals but also tune operating bands of output channels at the same time.

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Compact wearable 5‐GHz flexible filter

Cited by 20 publications

References 7 publications

Flexible Bandpass Filter Fabricated on Polyimide Substrate by Surface Modification and In Situ Self-Metallization Technique

Flexible Bandpass Filter Fabricated on Polyimide Substrate by Surface Modification and In Situ Self-Metallization Technique

A Flexible Microstrip Low-Pass Filter Design Using Asymmetric Pi-Shaped DGS

Design of a Liquid-Crystal-Tunable Terahertz Demultiplexer Based on a Metal-Insulator-Metal Waveguide

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