A Spherical Inverted-F Antenna (SIFA)

Yang

International Journal of Antennas and Propagation

2014

This paper presents a novel dual-band planar inverted-e-shaped antenna (PIEA) using defected ground structure (DGS) for Bluetooth and wireless local area network (WLAN) applications. The PIEA can reduce electromagnetic interferences (EMIs) and it is constructed on a compact printed circuit board (PCB) size of 10 × 5 × 4 mm3. Experimental results indicate that the antenna with a compact meandered slit can improve the operating impedance matching and bandwidths at 2.4 and 5.5 GHz. The measured power gains at 2.4 and 5.5 GHz band are 1.99 and 3.71 dBi; antenna efficiencies are about 49.33% and 55.23%, respectively. Finally, the good performances of the proposed antenna can highly promote for mobile device applications.

Section: Introductionmentioning

confidence: 99%

Compact Dual-Band Planar Inverted-e-Shaped Antenna Using Defected Ground Structure

Yang

International Journal of Antennas and Propagation

2014

IET Microwaves, Antennas & Propagation

“…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%

“…WSN-related antennas need to approach the fundamental performance limits [3][4][5][6][7][8], otherwise the cubic-millimetre 'Smart Dust' node [1,2] will remain a vision. Recently, the WSN antenna discipline has gathered momentum [9][10][11][12][13][14][15][16][17]. Theory predicts that small antenna design should opt for maximum occupation of the hypothetical minimum sphere that circumscribes the 'radiating' parts [3][4][5][6][7][8].…”

Section: Introductionmentioning

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%

See 1 more Smart Citation

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

Kakoyiannis

2014

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.

2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)

“…This paper discusses a potential application of the Spherical Inverted-F Antenna (SIFA, [1]) in gathering water wave acceleration data as part of a sensor network composed of buoys in order to localize the source of a shallow water disturbance. A spherical buoy was designed by integrating a SIFA into the buoy's hull.…”

Section: Introductionmentioning

confidence: 99%

Disturbance localization using a multifunctional antenna-buoy sensor network

Bennett

McKnight

Rolando

et al. 2014

Self Cite

This work examines the integration of a spherical inverted-F antenna (SIFA) and a spherical buoy structure. The resulting multifunctional antenna system includes an inertial measurement unit (IMU), microcontroller (MCU), rechargeable battery, and wireless radio. The IMU collects motion-dynamic information from the structure and relays this information in a star network configuration to a central node for processing. This information was used with numerically-derived shallow ocean wave propagation data as basis functions in a modified MUSIC algorithm to determine the wave fronts' point of origin. Results for the SIFA-buoy and network are included.