High-gain dipole antenna using polydimethylsiloxane–glass microsphere (PDMS-GM) substrate for 5G applications

Muhamad, Wan Asilah Wan; Ngah, Razali; Jamlos, Mohd Faizal; Soh, Ping Jack; Ali, Mohd Tarmizi

doi:10.1007/s00339-016-0633-3

Cited by 15 publications

(11 citation statements)

References 11 publications

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“…A thicker substrate was used to achieve more than 50% radiation efficiency in both modes. Another solution that can be applied to improve the antenna efficiency would be the reduction of materials losses e.g., through mixing PDMS with micro/nanoparticle [44], [45] or repetitive coating of the conductive fabric [46]. Underneath the ground plane, separated by a thin PDMS layer, there is DC biasing circuit of the antenna.…”

Section: A Antenna Configurationmentioning

confidence: 99%

A Conformal, Dynamic Pattern-Reconfigurable Antenna Using Conductive Textile-Polymer Composite

Mohamadzade

Simorangkir

Hashmi

et al. 2021

IEEE Trans. Antennas Propagat.

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A conformal antenna with electronically tuning capability of its radiation pattern between broadside and monopolelike patterns is proposed. The antenna is based on a proximityfed circular patch, loaded with a ring patch and four rectangular slots. The design is planar without any use of rigid shorting posts or complex feeding network. The reconfigurability is achieved by activating and deactivating the slots using PIN diodes, to switch between TM02 (monopole-like mode) and perturbed TM02 distributions (broadside mode) of the antenna. For conformability, the antenna is fabricated using highly flexible PDMSconductive fabric composite. All the antenna parts, including the RF switches, wires, and DC biasing circuit are fully encapsulated by PDMS to provide resilience against deformation and harsh environment. Investigations on the RF performance and mechanical stability of the antenna were conducted. Under various bendings, it was demonstrated that all the antenna components, including those for electronic switching, remained intact and in working order even under radius bending of 30 mm, thus maintaining good pattern reconfigurability and overall performance. When bent, the measured results at 5.2 GHz show a stable radiation performance relative to those of the flat case (i.e., maximum gain of 2.9 dBi and efficiency of 64% in broadside mode, corresponding to 1.75 dBi and 52% in monopole-like mode). To the best of our knowledge, all these features have never been demonstrated in previously published pattern reconfigurable antennas.

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Section: A Antenna Configurationmentioning

confidence: 99%

A Conformal, Dynamic Pattern-Reconfigurable Antenna Using Conductive Textile-Polymer Composite

Mohamadzade

Simorangkir

Hashmi

et al. 2021

IEEE Trans. Antennas Propagat.

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show abstract

“…In future, more research explorations can be conducted to increase the efficiency by reducing the losses contributed by the associated materials. One possible approach for reducing the loss of the PDMS can be doping it with low loss micro-particles, e.g., glass microspheres, the similar approach as utilized by [30] in millimeter-wave band. Another possibility is to improve the conductivity of the transparent fabric, for instance through multiple conductive coating of the fabric [31].…”

Section: Loss Analysis Of the Antennamentioning

confidence: 99%

An Electronically-Tunable, Flexible, and Transparent Antenna With Unidirectional Radiation Pattern

et al. 2021

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In this paper, a frequency reconfigurable, conformal, durable, optically transparent, and unidirectional antenna design is demonstrated for the first time. In the demonstrated design, continuous frequency tuning is achieved by integrating a varactor diode in a folded dipole radiator, which is backed by a water-filled reflector to produce unidirectional radiation pattern mimicking the radiation characteristics of microstrip patch antennas. The radiating component of the explored antenna is manufactured from transparent conductive fabric, which has about 72% optical transparency and occupies a small fraction of the entire antenna. The water-filled reflector is located underneath the dipole radiator. Water is contained inside a rectangular box made from flexible-transparent-hydrophobic polymer, polydimethylsiloxane (PDMS). Both water and PDMS are highly transparent, moreover, PDMS has excellent flexibility and water is a liquid, thus, the demonstrated antenna exhibits excellent transparency and durability against physical deformation. The tiny varactor diode integrated in the folded dipole radiator has insignificant effect on the overall transparency and flexibility of the antenna. The explored design has been numerically investigated and experimentally validated through measurements. Measurements show continuous frequency tuning from 2.38 GHz to 2.67 GHz with an average 10-dB return loss bandwidth of about 170 MHz. Moreover, the antenna maintains good front-to-back ratio in the entire operating band.INDEX TERMS 3-D printing, composite, conformal, folded dipole, polymer, pure water, tunable.

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“…Finally, a flexible dielectric substrate with reliable loss is formed [16]. For example, mixing glass with PDMS to reduce loss of the antenna [17] and using polymers to fabricate transparent-flexible wearable antenna [18].…”

Section: Introductionmentioning

confidence: 99%

Flexible Wearable Composite Antennas for Global Wireless Communication Systems

Zhang

Wang

et al. 2021

Sensors

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Although wearable antennas have made great progress in recent years, how to design high-performance antennas suitable for most wireless communication systems has always been the direction of RF workers. In this paper, a new approach for the design and manufacture of a compact, low-profile, broadband, omni-directional and conformal antenna is presented, including the use of a customized flexible dielectric substrate with high permittivity and low loss tangent to realize the compact sensing antenna. Poly-di-methyl-siloxane (PDMS) is doped a certain proportion of aluminum trioxide (Al2O3) and Poly-tetra-fluoro-ethylene (PTFE) to investigate the effect of dielectric constant and loss tangent. Through a large number of comparative experiments, data on different doping ratios show that the new doped materials are flexible enough to increase dielectric constant, reduce loss tangent and significantly improve the load resistance capacity. The antenna is configured with a multisection microstrip stepped impedance resonator structure (SIR) to expand the bandwidth. The measured reflection return loss (S11) showed an operating frequency band from 0.99 to 9.41 GHz, with a band ratio of 146%. The antenna covers two important frequency bands, 1.71–2.484 GHz (personal communication system and wireless body area network (WBAN) systems) and 5.15–5.825 GHz (wireless local area network-WLAN)]. It also passed the SAR test for human safety. Therefore, the proposed antenna offers a good chance for full coverage of WLAN and large-scale development of wearable products. It also has potential applications in communication systems, wireless energy acquisition systems and other wireless systems.

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High-gain dipole antenna using polydimethylsiloxane–glass microsphere (PDMS-GM) substrate for 5G applications

Cited by 15 publications

References 11 publications

A Conformal, Dynamic Pattern-Reconfigurable Antenna Using Conductive Textile-Polymer Composite

A Conformal, Dynamic Pattern-Reconfigurable Antenna Using Conductive Textile-Polymer Composite

An Electronically-Tunable, Flexible, and Transparent Antenna With Unidirectional Radiation Pattern

Flexible Wearable Composite Antennas for Global Wireless Communication Systems

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