28 GHz and 38 GHz Dual-Band Vertically Stacked Dipole Antennas on Flexible Liquid Crystal Polymer Substrates for Millimeter-Wave 5G Cellular Handsets

Hwang, In‐June; Oh, Ju-Ik; Jo, Hye-Won; Kim, Kwang-Seok; Yu, Jong‐Won; Lee, Dong Hoon

doi:10.1109/tap.2021.3137234

Cited by 31 publications

(13 citation statements)

References 37 publications

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“…In a wireless communication system that goes beyond 5G to 6G, developing a high-performance array antenna is essential to secure high gain, fast transmission speed, and wide signal coverage [1], [2], [3], [4], [5], [6]. Limitations in applying array antennas to actual commercial products include expensive and complex hardware and high-power consumption.…”

Section: Introductionmentioning

confidence: 99%

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

Kim

Saeed

et al. 2023

IEEE Access

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Liquid crystals (LCs) offer a promising playground for developing reconfigurable radio frequency devices due to their unique dielectric properties, including large birefringence and tunability. Previous research on reconfigurable phase shifters has primarily focused on studying loss, response, and tunability. However, the influence of surface-enforced alignment on LC remains an area that requires further exploration. Here, we designed a phase shifter using twisted nematic aligned cells. To characterize the phaseshifting behavior of the nematic LC, we employed the transmission line method within the frequency range of 5 to 8 GHz and extracted the dynamic electrical parameters. Numerical simulations based on finite element methods were conducted to predict the alignment of LC molecules and the propagation of waves within the test cell. The phase shifter achieved a phase difference of ∼220 • by applying a bias voltage to the LC. In particular, we compare the dynamic response of the phase shifter and a twisted LC configuration having a chiral dopant that responds 10 times faster than the homogeneous mode.INDEX TERMS Liquid crystal, dielectric anisotropy, phase shifter, twisted nematic configuration, chiral dopant.DOWON KIM (Member, IEEE) received the M.S. and Ph.D. degrees in electrical engineering from

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Section: Introductionmentioning

confidence: 99%

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

Kim

Saeed

et al. 2023

IEEE Access

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“…A reconfigurable 5G patch antenna having switching capability between 28 GHz and 38 GHz using PIN diode is proposed [7]. Again in [8] a vertical stacked dipole antenna array capable of operating at 28 and 38 GHz with respective gain of 4.8 and 4.6 dBi is defined. [9,10] has proposed their work on 5G NRn78 band .…”

Section: Introductionmentioning

confidence: 99%

“…[9,10] has proposed their work on 5G NRn78 band . In [8], hook shaped aperture coupled circularly polarized antenna having a B.W of 2.8 to 3.8 GHz with gain of 4.08 dBi is proposed. However, in [10] a dual polarized magneto-electric dipole with aperture coupled feed is proposed giving a B.W of 3.02 to 4.02 GHz with a gain ranging 7.9 to 8.5 dBi is proposed.…”

Section: Introductionmentioning

confidence: 99%

A Compact Patch Antenna for 5G Communication (39 GHz-mmWave-n260) Employing Aperture Coupled Feeding Technique

Abhishek

Suraj

2023

Preprint

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In the present work Aperture Coupled Feed (ACF) microstrip patch antenna for 5G communication is proposed. The proposed antenna has a very compact size of 2.2λg×2.2λg×0.3λg (mm3), it is printed on Rogers RT Duroid 5880 with Ꜫr =2.2. The antenna having two vertical layer of 0.8 mm separated by air gap of 0.035 mm. The upper edge of substrate has a circular ring patch working as radiator whereas bottom having no metallization. Upper portion of lower substrate has plus shape slot and at bottom is a rectangular feed line acting as feeder to patch antenna. The antenna operatable from 36.84 GHz to 46.78 GHz and having an operating frequency of 38.40 GHz. The overall B.W% achieved is 25.91% and peak gain observed to be 7.32 dB. The measured results are in close agreement with the simulated one. Prior to approaching ACF technique, a conventional microstrip patch antenna with circular radiator with size of 2.2λg×2.2λg×0.15λg (mm3), printed on single PCB of same material was considered. The antenna gets operatable from 33.07 GHz to 39.5 GHz and resonating at 38.02 GHz. The overall B.W% achieved is 17.10% and peak gain of 8.1 dB. Both antennas are good candidature for 5G Communications.

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“…Driven by the exponential growth in wireless data usage around the globe [ 1 ], wireless communication technologies and network capacity are advancing at unprecedented speeds. For consumer communication electronics with high integration and miniaturization, there is an urgent demand for lightweight and reconfigurable communication component systems that can arrange antennas and other RF-integrated circuits within them in order to cover more frequency bands in a limited compact space [ 2 ]. Based on common design methods, there is almost no spare space for RF components that are compatible with more frequency bands for the latest 5G (fifth-generation) mobile smartphones using highly integrated antennas [ 3 ]; however, the miniaturized, flexible, reconfigurable RF technology provides a promising solution to this challenge [ 2 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…For consumer communication electronics with high integration and miniaturization, there is an urgent demand for lightweight and reconfigurable communication component systems that can arrange antennas and other RF-integrated circuits within them in order to cover more frequency bands in a limited compact space [ 2 ]. Based on common design methods, there is almost no spare space for RF components that are compatible with more frequency bands for the latest 5G (fifth-generation) mobile smartphones using highly integrated antennas [ 3 ]; however, the miniaturized, flexible, reconfigurable RF technology provides a promising solution to this challenge [ 2 , 4 ]. The concept of flexible electronics that has the advantages of being flexible, miniaturized and highly integrated is a charming technology, which has unique technical advantages in application scenarios such as bio-integrated electronics and complex structural surface conformal integration.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Flexible RF MEMS

Shi

Shen

2022

Micromachines

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Microelectromechanical systems (MEMS) that are based on flexible substrates are widely used in flexible, reconfigurable radio frequency (RF) systems, such as RF MEMS switches, phase shifters, reconfigurable antennas, phased array antennas and resonators, etc. When attempting to accommodate flexible deformation with the movable structures of MEMS, flexible RF MEMS are far more difficult to structurally design and fabricate than rigid MEMS devices or other types of flexible electronics. In this review, we survey flexible RF MEMS with different functions, their flexible film materials and their fabrication process technologies. In addition, a fabrication process for reconfigurable three-dimensional (3D) RF devices based on mechanically guided assembly is introduced. The review is very helpful to understand the overall advances in flexible RF MEMS, and serves the purpose of providing a reference source for innovative researchers working in this field.

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28 GHz and 38 GHz Dual-Band Vertically Stacked Dipole Antennas on Flexible Liquid Crystal Polymer Substrates for Millimeter-Wave 5G Cellular Handsets

Cited by 31 publications

References 37 publications

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

A Compact Patch Antenna for 5G Communication (39 GHz-mmWave-n260) Employing Aperture Coupled Feeding Technique

Recent Advances in Flexible RF MEMS

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