Dual band- dual polarized planar inverted F-antenna for MBAN applications

Abstract

A planar inverted F-Antenna with the dual band-dual polarization property is presented for medical body area networks applications. The designed antenna covers the 2.45 GHz industrial, scientific and medical, 4 G long term evolution (2.5–2.69 GHz) bands for ON body communication and Wi-Fi and WLAN (3.5–3.6 GHz) bands for OFF body communication. At the lower band, an equivalent offset fed magnetic microstrip type dipole has been utilized that generate field parallel to the surface of the body for supporting ON body communication. The broadside radiation pattern has been realized using the slotted patch counterpart for supporting OFF body communication. This technique has resulted in a design of dual band dual mode property using a single radiator. The footprint of the antenna is only 0.35λg× 0.17λg× 0.08λg. Owing to its compactness, lightweight, and easy mountable property (due to foam substrate), the proposed antenna is found to be robust for MBAN applications. The maximum permissible transmitted power for the 1st band is 25.78 and 20.3 dBm for the 2nd one to maintain standard specific absorption rate limitations of 1.6 W/Kg. Experimental investigations over human body showed minimal deviations from the free space conditions which makes it a potential candidate for body-centric communications.

Printed GNSS and Bluetooth Antennas Embedded on Flexible Low Loss Substrates for Wearable Applications

“…The maximum obtained SAR value was 0.55 W/kg, which is acceptable for the BT antenna. By comparing the obtained SAR result of the BT antenna, attention is paid to the small size (23 mm×1 mm×0.015 mm), the operating frequency of 2.45 GHz, and the antenna to body distance [14], in which the ultra-wide band antenna size of 127 mm × 25 mm × 0.13 mm with a 2 mm antenna to the body distance was investigated. The ultra-wide band antenna exhibited increased SAR values of 3.75 W/kg at 850 MHz, 3.59 W/kg at 1900 MHz, and 3.45 W/kg at 2600 MHz for the wrist worn application.…”

“…It seems, however, that the wristwatch itself still provides a better location and performance for antennas than the wrist strip, where the efficiency was decreased. Some novel antenna structures [13][14][15][16] would be interesting to design on the wrist strip since their current performances were measured at a 5 mm distance from the body, whereas in this application the distance was only 0.8 mm.…”

“…The 2.45 band antenna provided 0 dB gain, and the body effect was tested with 5, 8, and 11 mm distances [13]. An ultra-wide band antenna operating in LTE bands (698-960, 1710-2170, and 2500-2700 MHz) was presented for wearable wrist worn applications in [14]. The antenna with a size of 127 mm × 25 mm × 0.13 mm was built on a flexible and very thin Kapton material.…”

Dual Band Circular Polarized Printed Dipole Antenna for S and C Band Wireless Applications

“…In [14], a dual-band dual-sense CP antenna with rotational symmetry of dipole structure is reported by Xu et al, which is upgraded from a bowtie dipole antenna (linear polarized). In [15], a compact planar inverted F-Antenna is presented by Bhattacharjee et al for dual-band (ISM 2.45 GHz band and 4G long term evolution band) and dualpolarized operation. To grasp the antenna performance in ON body conditions, a single and multi-layer tissue model is applied, and minimal deviations from the free space environment are attained which reflects that for body-centric communications porotype is a possible candidate.…”