Improvement of Antenna Radiation Efficiency by the Suppression of Surface Waves

Oraizi, Homayoon; Rezaei, Bahram

doi:10.4236/jemaa.2011.33013

Cited by 9 publications

(8 citation statements)

References 4 publications

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“…Antenna radiation efficiency can be improved in two ways. One technique is to suppress the surface waves of the antenna by removing little portion of the substrate in patch vicinity [94]. Other method is to apply high permittivity biocompatible superstrate [95].…”

Section: A Human Body Effects On Antenna Radiation Efficiencymentioning

confidence: 99%

Implantable Antennas for Bio-Medical Applications

Malik

Sant

Ajmal

et al. 2021

IEEE J. Electromagn. RF Microw. Med. Biol.

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Antenna design considerations for implantable devices in remote telehealth systems Take-Home Messages • Implantable sensors are pivotal to telehealth systems enabling continuous monitoring of a patient's vital health signs wirelessly. • Antennas are an integral element of these systems whose design is a complex task due to harsh and highly volatile in-body environment and requirements of robust and reliable performance while offering miniature structure, patient safety and biocompatibility. • A comprehensive critical review on the antenna design for implantable medical devices highlighting requirements, challenges, antenna types and human body effects on their performance shows that slotted patch antennas operating at higher frequencies can serve the purpose optimally. • The slotted patch antenna designed in the light of recommendations made offers a small size of 7.5×5×0.25 mm 3 with a-10 dB bandwidth of 25 MHz, a near-omnidirectional pattern and a gain of 1.7 dBi. • The paper can serve as a reference for the antenna designers working in the field of implantable devices providing state-of-the-art, current advancements, requirements, challenges as well as design rules.

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Section: A Human Body Effects On Antenna Radiation Efficiencymentioning

confidence: 99%

Implantable Antennas for Bio-Medical Applications

Malik

Sant

Ajmal

et al. 2021

IEEE J. Electromagn. RF Microw. Med. Biol.

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“…1(b). The structure of the proposed antenna has evolved from the basic CPW-fed disc monopole antennas [7,8] and is depicted in Fig. 2.…”

Section: Antenna Designmentioning

confidence: 99%

An Electrically Small Ultra-Wideband CPW-Fed Monopole Antenna

Vinisha¹,

Dinesh²,

Rajan³

et al. 2021

PIER C

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An electrically small ultra-wideband (UWB) antenna to cater to the need for UWB communication suitable for today's small gadgets is presented. The antenna is realized on a substrate of relative dielectric permittivity 4.4, loss tangent 0.02, and height 1.6 mm. The overall dimension of the antenna is 21 mm × 16 mm × 1.6 mm (0.217λ min × 0.165λ min × 0.0165λ min ), where λ min is the wavelength corresponding to the antenna's lowest operating frequency in free-space 3.1 GHz. The small 'k min a' value of 0.856 of the antenna, where k min is the wavenumber corresponding to λ min , and 'a' is the radius of the sphere that can fully enclose the antenna, is electrically small. The antenna operates at the FCC recommended UWB frequency range from 3.1 GHz to 10.6 GHz with a reasonably good 2 : 1 voltage standing wave ratio (VSWR) impedance bandwidth. A prototype of the proposed antenna is fabricated, and different radiation characteristics of the antenna in the frequency and time domain are measured and validated by simulation. The high pulse fidelity for different antenna orientations and very small group delay in the operating frequency band exhibit insignificant pulse distortion. The equivalent isotropically radiated power (EIRP) of the antenna satisfies the FCC mask in the entire UWB. The maximum gain and efficiency achieved within the UWB are 3.95 dBi and 93%, respectively. Radiation characteristics of the antenna in the UWB are studied in an anechoic chamber using Agilent PNA E 8362B.

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“…The total efficiency e tot includes the impedance mismatch loss of the antenna. The efficiency can be improved by reducing the surface wave loss by partial removal of substrate material [68], reducing mutual coupling between array elements [69].…”

Section: Antenna Array Parametermentioning

confidence: 99%

An Inclusive Survey on Array Antenna Design for Millimeter-Wave Communications

2019

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The enormous growth of wireless data traffic in recent years has made the millimeter-wave (mm-wave) technology as a good fit for high-speed communication systems. Extensive works are continuing from the device to system, to the radio architecture, to the network to support the communication in mm-wave frequency ranges. To support this extensive high data rate, beam forming is found to be the key-enabling technology. Hence, an array antenna design is an extremely important issue. The beam-forming arrays are chosen to achieve the desired link capacity considering the high path loss and atmospheric loss at mm-wave frequencies and also to increase the coverage of the mm-wave communication system. There are diverse design challenges of the array due to the small size, use of large numbers of antennas in close vicinity, integration with radio-frequency (RF) front ends, hardware constraints, and so on. This paper focuses on the evolution and development of mm-wave array antenna and its implementation for wireless communication and numerous other related areas. The scope of the discussion is extended on the reported works in every sphere of mm-wave antenna array design, including the selection of antenna elements, array configurations, feed mechanism, integration with front-end circuitry to understand the effects on system performance, and the underlying reason of it. The new design aspects and research directions are unfolded as a result of this discussion.INDEX TERMS Mm-wave communication, antenna array design, array configuration, feed mechanism, RF circuit. SASWATI GHOSH received the Ph.D. degree from IIT Kharagpur, India, where she is currently a Postdoctoral Research Fellow with G. S. Sanyal School of Telecommunications. She is involved in active research in the area of antenna design for 60-GHz communication, RF energy harvesting, EMI/EMC measurements and EMI sensors, estimation of EMC of high-frequency electronic systems, and EMI/EMC/ESD on spacecraft bodies. She has 15 international journal publications, three book chapters, and more than 60 publications, including national journals and national/international conference proceedings. She serves as a Reviewer for several international journals. She had received the Young Scientist Fellowship twice and the Women Scientist Fellowship from the Department of Science and Technology, Government of India. DEBARATI SEN received the Ph.D. degree in telecommunication engineering from IIT Kharagpur, Kharagpur, India, where she is currently an Assistant Professor. Her research interests include wireless and optical communication systems, mostly on MB-OFDM, synchronization, equalization, UWB, BAN, green communications, 60-GHz communications, and baseband algorithm design for coherent optical communications.

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Improvement of Antenna Radiation Efficiency by the Suppression of Surface Waves

Abstract: ABSTRACT

Cited by 9 publications

References 4 publications

Implantable Antennas for Bio-Medical Applications

Implantable Antennas for Bio-Medical Applications

An Electrically Small Ultra-Wideband CPW-Fed Monopole Antenna

An Inclusive Survey on Array Antenna Design for Millimeter-Wave Communications

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