Integrated Antennas for Wireless Personal Communications

Rahmat‐Samii, Y.; Guterman, J.; Moreira, António; Peixeiro, C.

doi:10.1002/9780470294154.ch22

Cited by 11 publications

(10 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The bandwidth is defined here as the impedance bandwidth for |S 11 | ≤ −6 dB, or equivalently VSWR ≤ 3. In fact, as bandwidth is not uniquely defined, this is a commonly accepted value given the application, in addition to the fact that the antenna is severely space-constrained [26]. The measured free space impedance bandwidth is BW 6dB,FS = 108 MHz ∼ 4.4%, and the on-body bandwidth is BW 6dB,ITE = 149 MHz ∼ 6.1%.…”

Section: B Resultsmentioning

confidence: 99%

Wearable Shell Antenna for 2.4 GHz Hearing Instruments

Ruaro

Thaysen

Jakobsen

2016

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

Abstract-A novel concept for an electrically-small on-body antenna targeted for 2.4 GHz ISM band custom in-the-ear (ITE) hearing instrument (HI) applications is introduced. The antenna is based upon a cavity-backed design in order to take advantage of the maximum volume available in the ear while providing isolation from the user's body, and it occupies only 40% of the volume of the sphere with radius a = 12 mm. The antenna is implemented on a realistic 3D-printed lossy substrate and exhibits high efficiency of 70% and 22%, and a 6-dB impedance bandwidth of 108 MHz and 149 MHz, when the antenna is measured in free space and ITE, respectively. A measurement campaign conducted in free space and on a specific anthropomorphic mannequin (SAM) head with ears shows that the radiation pattern is optimal for HI applications. Furthermore, the antenna is primarily polarized normal to the surface of the head to ensure the best on-body path gain. This is substantiated by the study of the ear-to-ear (E2E) path gain, which is measured and compared to analytic and numerical results.Index Terms-Cavity-backed antennas (CBA); conformal antennas; electrically small antennas (ESA); medical devices; onbody communications; wearable antennas; wireless body-area networks (WBAN).

show abstract

Section: B Resultsmentioning

confidence: 99%

Wearable Shell Antenna for 2.4 GHz Hearing Instruments

Ruaro

Thaysen

Jakobsen

2016

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…(Wong, 2003) In spite of their simple structures, all these monopole and helical antennas have still high dimensions especially for mobile station systems. Besides, these antennas can be considered as external antennas since they are usually mounted outside the mobile systems such as mobile handset, and external antennas are more sensitive to the position of nearby objects, for instance, head of a human (Rahmat-Samii et al, 2008). For these reasons, internal printed monopole antennas supplying lower profile and higher bandwidth for multiband operations are generally preferred.…”

Section: Monopole (Whip) and Helical Antennasmentioning

confidence: 99%

“…For indoor mobile communication, moderate gain (5-7 dBi) is usually sufficient (Serra et al, 2007;Secmen & Hizal, 2010). However, the gain of the antenna may decrease even to 1 dBi within the designated frequency band for handset applications (Rahmat-Samii et al, 2008).…”

Section: Gainmentioning

confidence: 99%

“…In base station systems, the constraint of VSWR≤ 2 (or sometimes shown as VSWR 2:1) is usually sufficient, which corresponds to about 10% reflected power from the antenna. On the other hand, mobile station antennas such as handheld antennas are typically designed to have VSWR≤ 3 for multiband systems due to very tight volume constraints (Rahmat-Samii et al, 2008).…”

Section: Main Antenna Parameters For Mobile Communication Systemsmentioning

confidence: 99%

“…The mutual coupling effect in these systems using polarization diversity (one antenna with two orthogonal feeds) is usually higher than the systems using spatial diversity (different antennas). As for mobile station applications such as mobile phone or notebook computer antennas, the mutual coupling requirement may increase up to -10 dB (Rahmat-Samii et al, 2008). …”

Section: Mutual Couplingmentioning

confidence: 99%

See 2 more Smart Citations

Multiband and Wideband Antennas for Mobile Communication Systems

Seçmen¹

2011

Recent Developments in Mobile Communications - A Multidisciplinary Approach

View full text Add to dashboard Cite

Dielectric Resonator Antennas

Yang,

Leung

2024

Encyclopedia of RF and Microwave Engineering

View full text Add to dashboard Cite

Dielectric resonator (DR) antenna (DRA) has been studied for decades, for its compact size, various radiation modes and radiation patterns, high efficiency, high design flexibility, and so on. As a fabrication‐friendly shape, cylindrical DRA is investigated in this chapter. To begin, the fundamentals of cylindrical DRA have been introduced first, including its mode nomenclature, resonant frequency calculation, field distribution, and various excitation methods. Especially, two kinds of planar feeding methods for exciting TM modes of a cylindrical DRA were developed recently and introduced. Researchers all over the world are exploring the diversity potential of DRA, including pattern diversity. However, it can be found that the resonant frequencies of the and modes cannot coincide, implying there are theoretical limitations for pattern‐diversity designs using fundamental modes. In this chapter, two pattern‐diversity designs are presented with the fundamental modes. The first wideband design uses a cylindrical DRA with a centrally loaded high‐permittivity material. This kind of material can lengthen the electrical length of the mode and therefore lower its resonant frequency. At the same time, the resonant frequency of the mode can be affected little. This design features an overlapping impedance bandwidth of 23.6%. For the latter compact design, a meanderline‐loaded ring slot is employed to excite the mode. By lengthening the current paths on the ground plane with the meander lines, the resonant frequency of the mode can be reduced, whereas that of the mode can be found to be unchanged. This compact design has a volume of and a profile of , where is the resonant wavelength in the dielectric. Both of the designs have low envelope correlation coefficients (ECCs), proving to be good diversity antennas.

show abstract

Integrated Antennas for Wireless Personal Communications

Cited by 11 publications

References 51 publications

Wearable Shell Antenna for 2.4 GHz Hearing Instruments

Wearable Shell Antenna for 2.4 GHz Hearing Instruments

Multiband and Wideband Antennas for Mobile Communication Systems

Dielectric Resonator Antennas

Contact Info

Product

Resources

About