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FLEXIBLE THREE DIMENSIONAL FOLDED SLOT ANTENNA FOR BODY-WORN WIRELESS DEVICES

IP.com Disclosure Number: IPCOM000239313D
Publication Date: 2014-Oct-29
Document File: 9 page(s) / 654K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique to enable a wireless link for wearable wireless device. The technique includes a three dimensional (3D) folded flexible slot antenna design of small size for the wearable wireless devices. The antenna is small in size with low profile and worn on hand wrist or some other places on a human body. The antenna maintains radiation efficiency while being loaded on the human body and radiation pattern is close to Omni direction. The antenna operates around certain gigahertz (GHz) to satisfy all requirements, which include small size, low profile and worn on hand or body part in order to enable long-range wireless transmission. The antenna slot includes slotted ground plane, supported by a flexible thin substrate of kapton. Under the substrate is a microstrip feed line to excite the slot and a matching hub. A flexible dielectric strip of kapton, which is loaded on top of the slot, supports a capacitive metal strip.

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FLEXIBLE THREE DIMENSIONAL FOLDED SLOT ANTENNA FOR BODY-WORN WIRELESS DEVICES

BRIEF ABSTRACT

The invention proposes a technique to enable a wireless link for wearable wireless device. The technique includes a three dimensional (3D) folded flexible slot antenna design of small size for the wearable wireless devices. The antenna is small in size with low profile and worn on hand wrist or some other places on a human body. The antenna maintains radiation efficiency while being loaded on the human body and radiation pattern is close to Omni direction. The antenna operates around certain gigahertz (GHz) to satisfy all requirements, which include small size, low profile and worn on hand or body part in order to enable long-range wireless transmission. The antenna slot includes slotted ground plane, supported by a flexible thin substrate of kapton. Under the substrate is a microstrip feed line to excite the slot and a matching hub. A flexible dielectric strip of kapton, which is loaded on top of the slot, supports a capacitive metal strip.

KEYWORDS

Wireless device, Slot antenna design, Substrate, Dielectric strip


DETAILED DESCRIPTION

Generally, sensors that monitor different vital sign, such as, electrocardiogram(ECG), oxygen saturation (SpO2), temperature, and heart rate, among others are critical to hospital and healthcare operations. Sensors require cables running from a patient body to the stationary hub, which comes with hassles, delay time due to entangled cables and more susceptible to failure when the cables are disconnected due to patient movement. Wearable wireless sensors are critical to enable higher efficiency in term of time and performance of the hospital and health care operations. Key feature to enable the wireless link for wearable devices is the antenna. However, the antenna in this application faces unique challenges. The antenna is required to be small in size and low profile such that the device is worn on the hand or some other places on the body. The device is required to cover a wide frequency bandwidth of the medical body area networks(MBAN) and industrial, scientific and medical (ISM) frequency range to accommodate high data rate and radiation pattern close to omnidirectional. Ceramic chip antenna is deployed for many wearable electronics and antennas are susceptible or detuned by the electronic environment of the device and the body loading. This is difficult for antennas to be tuned because it is difficult to estimate detuning capacitance of the electronic environment that detune the operating frequency of the chip antennas. Additionally, tuning antennas with lump components such as capacitors and inductors often reduce the operation bandwidth of the antennas.

A conventional technique includes planar inverted-F antennas (PIFA) and meanderline monopole antennas for the sensors. However, the conventional technique minimizes omnidirectional antennas by shorting and loading lump circuit elements.

Another conventional techniq...