SMILA: A compact and efficient antenna for mobile communications

Zürcher, J. F.; Staub, O.; Skrivervik, Anja K.

doi:10.1002/1098-2760(20001105)27:3<155::aid-mop1>3.3.co;2-g

Cited by 2 publications

(11 citation statements)

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“…This paper is about a small, conformable IFA; closely related studies from the corresponding survey are [4,5,11,[18][19][20][21].…”

Section: Literature Survey On Small Conformable Ifasmentioning

confidence: 99%

“…The smart monoblock-integrated L-antenna (SMILA) [4,5,18,19] is a bent, all-metal, planar IFA mounted on the side of a round wristwatch. The SMILA was initially implemented as a single-band radiator at 1.875 GHz [4,5,18]. Its electrical size was estimated at ka = 0.71 rad, whereas it exhibited an fractional bandwidth (FBW) FBW V = 4.1% at 2:1 voltage standing wave ratio (VSWR) level (Q ≃ 17.3).…”

Section: Literature Survey On Small Conformable Ifasmentioning

confidence: 99%

“…Huff and McDonald [11] described the properties of a spherically conformal antenna designed with a miniaturisation technique similar to the planar IFA, but recessed into a spherical metallic chassis. Like the SMILA [4,5,18,19], the SIFA [11] is a prime user of the circumscribing sphere. The SIFA operated at 0.408 GHz, and was controlled by five angles and two radii.…”

Section: Literature Survey On Small Conformable Ifasmentioning

confidence: 99%

“…1. The SMILA [4,5,18,19], which is a 3D topology, corresponds to a cylindrical version of the planar IFA. 2.…”

Section: Literature Survey On Small Conformable Ifasmentioning

confidence: 99%

“…Instead of filling the sphere with current-carrying conductors, the radiating currents and/or electric fields should be brought outwards to the edges of the allocated space. This critical observation has found its way into small antenna designs, particularly three-dimensional (3D) implementations shaped after cylinders, cubes and spheres [4,5,[9][10][11][12][18][19][20][21][22], and has influenced this work.…”

Section: Introductionmentioning

confidence: 99%

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Robust, electrically small, circular inverted‐F antenna for energy‐efficient wireless microsensors

Kakoyiannis

2014

IET Microwaves, Antennas & Propagation

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The size of wireless microsensors is fundamentally limited by the bulk of the antenna and the energy pool; total energy efficiency and battery size are determined by total antenna efficiency. A printed circular inverted‐F antenna (CIFA) is mirrored against a small, crescent‐like ground plane (GNDP). The CIFA is printed on a discoid substrate that conforms to the element, the GNDP and the circumscribing sphere. It is an electrically small element designed with only three parameters: two angles and a radius. The CIFA‐plus‐GNDP radiator is resonant and matched at 2.5 GHz, where numerical results indicate that it achieves a 3.4% fractional bandwidth (FBW) combined with over 90% of efficiency, exhibits a near‐isotropic gain pattern (8 dB deviation), and approaches Thal's limit on minimum Q‐factor within 43%. The prototype CIFA achieves the required half‐radian size while scoring FBW = 3.1% (55% deviation from minimum Q) and 89.5–91.5% efficiency. Two problems pertinent to the design of small antennas for miniature portable devices are also discussed. First, an upper bound on achievable directivity is proposed, which facilitates quick assessment of antenna feasibility as a function of specified electrical size. Then, a forecast model for the prediction of minimum required operating frequency is developed based on the properties of the equivalent circuit at antenna input.

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“…This paper is about a small, conformable IFA; closely related studies from the corresponding survey are [4,5,11,[18][19][20][21].…”

Section: Literature Survey On Small Conformable Ifasmentioning

confidence: 99%