A helical folded dipole antenna for medical implant communication applications

Abstract

Currently, most of implanted medical devices are using inductive coupling for communication, which leads to difficulty in transmitting medical data records for several meters range. In order for the implanted device is able to be used in longer range transmission, the device is wirelessly transmitted in the form of electromagnetic signals. This initiates us to study on a patient home monitoring system, in which the external devices such as portable equipments will provide a benefit for healthcare provider in accessing the important patient medical information via a networked connection. Because of this reason, an electrically small antenna for implantable devices is very essential components in monitoring systems to provide wirelessly communication between a patient and an access point. In this paper, a helical folded dipole antenna for an implantable device is proposed for wireless patient monitoring system. The implanted device is assumed to be applied by a syringe injection allowing to the device is simply injected into the human body. The proposed antenna is operated in UHF band 924 MHz, as a band of Indonesian RFIDapplications. The antenna is quite small in comparison to the band operation (ka≈0.08). Sufficient electrical performances are obtained such as reflection coefficient, impedance bandwidth, radiation pattern and gain. According to the link budget analysis, the proposed antenna has adequate gain within 10m transmission range by 225 MHz bandwidth (VSWR ≤ 2).

A compact implantable RFID tag antenna dedicated to wireless health care

“…The dimensions of the proposed antenna are comparable to the ones achieved by Refs. , and . Antenna structures of Refs.…”

“…However, the short read range and low data rates associated with these bands make them unsuitable for real‐time subject monitoring applications. Recent research work on the implantable antenna design shows an inclination toward using ultra‐high‐frequency and industrial‐scientific‐medical (ISM) as the operational bands to achieve longer activation distances and high data rates …”

“…A meandered PIFA design achieves the required compact size but at the cost of degraded radiation performance . In this regard, folded and loop structures offer a better combination of size miniaturization and radiation efficiency …”

“…Recent research work on the implantable antenna design shows an inclination toward using ultra-high-frequency and industrial-scientificmedical (ISM) as the operational bands to achieve longer activation distances and high data rates. [12][13][14][15][16][17][18][19][20][21][22][23] Impedance mismatch and radiation efficiency degradation are the two main concerns of the in-body tag antennas. Designing the antenna directly inside a phantom mimicking the electromagnetic behavior of the targeted body part for the implant helps in tackling the impedance mismatch issue.…”

A Circularly Polarised Implantable Monopole Antenna for Biomedical Applications

“…Various types of implantable antennas such as planer inverted-F antenna (PIFA) [3,4], helical antennas [5], loop antennas [6], slot antennas [7] have also been proposed. In [8,9], multilayer configurations are used to reduce the antenna size.…”