Compact ingestible planar inverted-F antenna (PIFA) for biotelemetry systems
Bleeding from the gastrointestinal (GI) tract is a common medical problem. The GI tract starts at the mouth, going to the oesophagus, stomach, small intestine, colon and end at the rectum and anus. The traditional wired endoscopy made it possible to diagnose the oesophagus, stomach, colon, rectum a...
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| Format: | Thesis |
| Language: | English |
| Subjects: | |
| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61543/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/61543/2/Full%20text.pdf |
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| Summary: | Bleeding from the gastrointestinal (GI) tract is a common medical problem. The GI tract starts at the mouth, going to the oesophagus, stomach, small intestine, colon and end at the rectum and anus. The traditional wired endoscopy made it possible to diagnose the
oesophagus, stomach, colon, rectum and anus, but limited by physical reasons, leaving
the remaining 20 feet of the small intestines regardless using upper or lower endoscopy
procedures. An ingestible wireless biomedical device or wireless capsule endoscope
fitted with a mini video camera and small enough to swallow can painlessly examine
the parts that wired endoscopy cannot reach for diagnosing unexplained bleeding or
other abnormalities. The challenging demand of ingestible wireless biomedical device
performance reflects on the difficulties of designing the antenna for those device since
the antenna plays a key role for having an abundance of quality communication links
and miniaturization of the whole device, compared to the other essential components. In
this thesis, a compact planar inverted-F antenna (PIFA) is proposed to be integrated
with an ingestible tablet antenna system for biotelemetry application in the 2.4-2.48
GHz industrial, scientific, and medical (ISM) band. By taking the tissue properties and
its losses, the design of the proposed antenna was performed inside a phantom box filled
with body tissue simulating liquid (BTSL) (εr = 52.7). Besides reducing simulation time,
this is mainly due to the practical ease to validate and measure its similar performance
within the environment of a human small intestine (εr = 54.4). The proposed antenna is
compact and is sized at 859 mm3 (15 mm x 12 mm x 4.7748 mm). It is built using twostacked
structures; Taconic TLY-5 (εr = 2.2, tan δ = 0.0009) substrate and Eccostock
HiK500F ceramic material (εr = 30, tan δ = 0.002). The resonance characteristic,
radiation performance, specific absorption rate (SAR) distribution and communication
link of the proposed antenna inside the BTSL is evaluated and compared with its
performance inside a four-layer canonical tissue model (skin, fat, muscle and small
intestine). Most importantly, the proposed antenna achieved the highest bandwidth per
unit volume (BW/Vd) compared to other work in literature for in-body applications. |
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