Phase Enhancement for Multi-Resonance Compact Metamaterial Antennas

Abdalla, Mahmoud A.; Ibrahim, Ahmed A.; El-Azeem, and Mohamed Hassan Abd

doi:10.2528/pierc15082205

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…Composite right/left-handed transmission lines (CRLH) (65), also referred to as negative refractive index, have unique nonlinear frequencydependent sub-wavelength impedance or phase electromagnetic wave propagation. Thanks to these properties many compact and multi-band antennas have been realized (66)(67)(68), especially at low microwave frequencies, using CRLH. The approach was made to target to produce a significant bandwidth at the same time eliminate the cost of large antenna volume.…”

Section: Miniaturization Of the Antennamentioning

confidence: 99%

A review of implantable and ingestible antenna for wireless capsule endoscopy system

Tai,

Zulkefli,

Soh

2023

The 15th Universiti Malaysia Terengganu Annual Symposium 2021 (Umtas 2021)

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Wireless medical devices are utilized to obtain physiological signals from the human body to an external monitoring device. The in-body antenna plays a crucial role in ensuring the transmission of physiological signals for implantable or ingestible wireless medical devices. One of the wireless medical devices that involve implantable and ingestible antennas is capsule endoscopy. The implantable one is to be implanted surgically into the human body while the ingestible one is swallowed like a multi-vitamin to perform a wide variety of diagnostic and therapeutic functions in the gastrointestinal (GI) tract. A review of both antennas and their application is presented. Besides, the design of such in-body antenna in the wireless capsule endoscopy especially in current technologies (e.g Wi-Fi, WLAN, Bluetooth, IoT) is extremely challenging and intriguing owing to it deals with the challenges related to the selection of operating frequency band, type of antenna design, and antenna miniaturization technique. Most of the antenna is facing the issue with bandwidth, transmission rate, the robustness of the communication links, size constraint, components arrangement in capsule, and others that could directly affect the patient safety and performance of capsule endoscopy in the human body. Nevertheless, the application of such implantable and ingestible antenna in wireless capsule endoscopy is incessant and rapid growth along with the evolution of technology, thus eliminating any concerns related to the aforementioned challenges and their invasive nature. In this paper, comparative reviews on the design consideration of the in-body antennas are discussed.

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Section: Miniaturization Of the Antennamentioning

confidence: 99%

A review of implantable and ingestible antenna for wireless capsule endoscopy system

Tai,

Zulkefli,

Soh

2023

The 15th Universiti Malaysia Terengganu Annual Symposium 2021 (Umtas 2021)

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“…CRLH cells consist of capacitors in series and inductors in shunt. In addition, due to the remarkable features such as nonlinear phase, positive, negative, and zero-propagation of antenna properties, which make them very useful for controlling the electrical-length of the antenna resulting in more compactness than traditional halfwavelength antennas with multi-band configurations [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Design of Compact Meta-material CRLH Antenna for Wireless Applications

Abdelaziem

Ibrahim

Abdalla

et al. 2021

Journal of Advanced Engineering Trends

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This article presents a compact design of a composite-right-left-handed (CRLH) antenna for wireless applications. The antenna is fed using a coplanar waveguide (CPW) feed structure. The CRLH-antenna is comprised of one CRLH unit cell. The CRLH unit cell has a series capacitance (interdigital capacitor) and a shunt inductor (stub meander inductor). The antenna achieves compactness with a small size of 16.5 mm × 26 mm × 1.6 mm, thanks to the CRLH features such as nonlinear phase. The proposed antenna achieves a size reduction of better than 50 % with respect to the microstrip patch antenna operated at the same frequency band. The operating frequency band of the proposed antenna is from 5.83GHz to 6.3 GHz for WLAN applications, dedicated short range communications (DSRC), and intelligent transportation systems (ITS). Also, the antenna fulfills a radiation performance of omnidirectional pattern. To confirm the antenna design performances, a prototype is fabricated, and the reflection coefficient and radiation patterns are measured. Furthermore, the measured results have a good match with the simulation results.

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“…From other aspects, the coplanar waveguide (CPW)-fed antenna is simple to be integrated with other microwave circuits. For reducing the size of the CPW ground, asymmetric coplanar strip (ACS)-fed antenna has been suggested to reduce the microwave devices and antennas [11,12] To reduce the size as well as coupling effects, composite rightleft-handed (CRLH) transmission line (TL) structures have been used for small-sized antennas [13][14][15][16][17][18][19] and also in MIMO TL antennas with small mutual coupling [20][21][22][23][24]. This has been gained thanks to the CRLH unique electromagnetic properties such as anti-parallel group velocities, zeroth-order resonance and nonlinear phase.…”

Section: Introductionmentioning

confidence: 99%

Compact ACS‐fed CRLH MIMO antenna for wireless applications

Ibrahim

Abdalla

2018

IET Microwaves, Antennas & Propagation

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This paper introduces a compact asymmetric coplanar strip (ACS)-fed composite right left handed (CRLH) MIMO antenna for multiband operation. The ACS-fed MIMO antenna is composed of two elements, each is operating at 5 GHz, 5.8 GHz and 6.3 GHz; for different wireless applications. The overall MIMO antenna size is compact (46 ×26 mm 2 ). A unit cell of the CRLH connected to 50 Ω ACS-fed is considered the main block of the antenna. The edge to edge separation between antenna elements equals 0.4λ λ λ λ 0 at 5 GHz. The insertion loss, correlation coefficient, diversity gain and channel capacity are used to evaluate the performance of the ACS-fed MIMO antenna. The isolation higher than 25 dB and envelope correlation lower than 0.05 have been achieved without using any extra decoupling structures. The experimental results are reasonably well agreed with simulated ones.

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Phase Enhancement for Multi-Resonance Compact Metamaterial Antennas

Cited by 9 publications

References 27 publications

A review of implantable and ingestible antenna for wireless capsule endoscopy system

A review of implantable and ingestible antenna for wireless capsule endoscopy system

A Design of Compact Meta-material CRLH Antenna for Wireless Applications

Compact ACS‐fed CRLH MIMO antenna for wireless applications

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