Bandwidth Enhancement of an Implantable Antenna

Abstract

An antenna with bandwidth enhancement is proposed for ingestible capsule systems at Medical Device Radiocommunications Service (MedRadio, 401 MHz-406 MHz) band. The antenna is firstly designed and optimized in planar form on Rogers 3010 to validate the feasibility of the wideband performance. By introducing a strip connected to a simple dipole, a new resonance is introduced besides its fundamental resonance. Thus, bandwidth enhancement can be achieved and the simulated bandwidth of the proposed antenna after optimization increases from 25.7% to 37.8% compared to the antenna without the strip. To verify the wide bandwidth performance, measurement is carried out and the result turns out that wideband performance of the proposed configuration can be achieved. Moreover, the configuration is re-optimized on the surface wall of a capsule in a conformal form to achieve a bandwidth enhancement from 18.9 % to 36.1%.Index Terms-Bandwidth enhancement, medical device radiocommunications service (MedRadio) band, ingestible capsule, implantable antenna.

Miniature Coplanar Implantable Antenna on Thin and Flexible Platform for Fully Wireless Intracranial Pressure Monitoring System

“…In the literature, researchers have reported several implant antenna miniaturization techniques. These include (i) using of high permittivity dielectric substrate/superstrate materials [18][19][20], (ii) lengthening of the current path on the radiating patch by meandering/spiraling and/or inserting the slot/line [21][22][23][24][25], (iii) inserting a shorting pin between the radiating patch and the ground plane (planar inverted-F antenna configuration) [26][27][28][29], (iv) vertically stacking two or more radiating patches [30][31][32], and (v) loading (inductive, capacitive, or split ring) for impedance matching [33][34][35][36]. Despite the small footprint and adequate electromagnetic performance combined with dual-band operation, the above-mentioned antennas are rigid with significant thickness generally measured in millimeters.…”

An ingestible capsule system for in‐body core temperature monitoring

“…At the same time, an in vivo measurement of data telemetry is carried out and the variations of temperature are displayed in real time. Conformal printed antenna, on account of its low profile making use of inner volume of capsule cavity, can also be applied for in‐body capsule. In Ref.…”

Dual-Resonant Implantable Circular Patch Antenna for Biotelemetry Communication

“…Designing an implantable antenna inside human body faces many challenges, such as miniaturization, bandwidth, biocompatibility, patient safety, and good radiation performance. Nowadays, printed planar inverted-F antennas (PIFAs) have been used to design implantable antennas by many researchers due to their own advantages such as small size and omnidirectional radiation pattern [5][6][7][8][9][10]. Miniaturization is a key requirement owing to some strict constraints on implantable antenna size.…”

“…An implantable broadband low SAR antenna was proposed by combining a sigma-shaped monopole radiator and a novel C-shaped, coupled ground [9]. Reference [10] proposed a conformal broadband dipole antenna, whose bandwidth can reach 36.1%. As shown above, the aforementioned antennas are all of rectangular shape, and they have sharp angles and edges.…”