Dual‐band electrically coupled loop antenna for implant applications

Abstract

Recent low power implant to off‐body communication systems uses both medical implant communication services (MICS) and industrial, scientific, and medical (ISM) frequency bands. In these systems, MICS band and ISM band (2.45 GHz) are dedicated for data transmission and wake‐up signal, respectively. This dual band operation which incredibly extends the life time of battery forces designers to use dual band antennas in both implant and off‐body sides. In this study, a dual band implant electrically coupled loop antenna is proposed. This antenna as dual of planar inverted‐F antenna is a magnetic antenna with inherently low near zone electric field and therefore produces low specific absorption rate (SAR) inside the body. The antenna is miniaturised using a lumped capacitor. In spite of small size of 5 × 5 × 3 mm3, the simulated 1 g average SAR is smaller than reported dual band implant antennas in both frequency bands and makes the proposed antenna a good candidate for implant applications.

An SRR based miniature implantable antenna with a slit loaded ground at MedRadio and ISM bands for biotelemetry applications

“…Besides, dual‐band and multi‐band implantable antennas covering both the MedRadio and ISM bands were also proposed for biotelemetry applications. Within this context, a planar miniaturized implantable antenna with low SAR values was reported in Reference 7, and the design of an electrically coupled loop implantable antenna was proposed in Reference 8. A dual‐band implantable antenna design based on serpentine patch elements was investigated in Reference 1 to achieve size reduction.…”

Compact implantable antenna design for MICS and ISM band biotelemetry applications

“…In addition, dual‐band and multiband implantable antennas with various structures have been recently proposed for both the MICS and ISM bands of biotelemetry applications. In this context, an electrically coupled loop and a planar low profile antenna designs exhibiting low SAR values were presented in References and , respectively. Planar inverted‐F antennas (PIFAs) with two types of radiators were investigated in Reference for size reduction and improvement of SAR values.…”

“…In addition, a shorting pin appropriately placed between the top copper plate and the ground plane is employed for size reduction as in PIFA designs, while a hook‐shaped slot located in the ground plate of the design is utilized for improvement of impedance matching and bandwidth enhancement as presented in Reference . The proposed ICSRA with novel miniature configuration can cover both MICS (402‐405 MHz) and ISM (433‐434 MHz / 2.4‐2.84 GHz) bands simultaneously and it has a smaller structure as compared to the implantable antenna designs having dual‐band and multiband operation presented in References .…”

Wideband printed monopole antenna for application in wireless communication systems

“…In the past few decades, tremendous research has been carried out to achieve various design objectives. Several wideband low-profile antennas have been designed by employing a slot antenna [7][8][9][10], a loop antenna [11,12] and a spiral antenna [13][14][15]. An electromagnetic band-gap (EBG) structure, which is an artificial electromagnetic material, has been used to reduce the antenna dimensions to <0.1λ 0 .…”