TY - JOUR
T1 - A Wideband Dual-Polarized Ring-Loaded Cross Bowtie Antenna for Wireless Capsule Endoscopes
T2 - Design and Link Analysis
AU - Wang, Han
AU - Feng, Yuan
AU - Hu, Feng
AU - Guo, Yong-Xin
PY - 2022/9
Y1 - 2022/9
N2 - This work presents a novel on-body wideband dual-polarized antenna to stabilize and enhance the link performance of wireless capsule endoscopy systems. By introducing a cross-bowtie structure with a planar compact feed method, the antenna achieves a dual-polarized performance with high port-To-port isolation. A loaded ring with additional stubs is also implemented to further enhance the bandwidth and provide a flat in-band performance from 381 to 990 MHz. The proposed antenna is measured with both homogeneous phantom and ex vivo test to validate the impedance matching performance. To validate the effectiveness of the proposed on-body antenna on the communication link, a capsule helical antenna with omnidirectional radiation pattern is designed and measured. Finally, comprehensive link studies are conducted considering the varied capsule orientations and locations, with a peak \S21| value of-25.5 dB at the 60 mm implant depth and an acceptable link loss due to the capsule position error. The proposed on-body antenna can be regarded as a good candidate for a practical capsule endoscopy system due to its stable and enhanced transmission performance when compared with its counterparts. © 2022 IEEE.
AB - This work presents a novel on-body wideband dual-polarized antenna to stabilize and enhance the link performance of wireless capsule endoscopy systems. By introducing a cross-bowtie structure with a planar compact feed method, the antenna achieves a dual-polarized performance with high port-To-port isolation. A loaded ring with additional stubs is also implemented to further enhance the bandwidth and provide a flat in-band performance from 381 to 990 MHz. The proposed antenna is measured with both homogeneous phantom and ex vivo test to validate the impedance matching performance. To validate the effectiveness of the proposed on-body antenna on the communication link, a capsule helical antenna with omnidirectional radiation pattern is designed and measured. Finally, comprehensive link studies are conducted considering the varied capsule orientations and locations, with a peak \S21| value of-25.5 dB at the 60 mm implant depth and an acceptable link loss due to the capsule position error. The proposed on-body antenna can be regarded as a good candidate for a practical capsule endoscopy system due to its stable and enhanced transmission performance when compared with its counterparts. © 2022 IEEE.
KW - Capsule endoscopy
KW - cross-bowtie antenna
KW - dual-polarized
KW - ex vivo test
KW - helical antenna
KW - polarization
KW - wearable
UR - http://www.scopus.com/inward/record.url?scp=85129623764&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85129623764&origin=recordpage
U2 - 10.1109/TAP.2022.3168272
DO - 10.1109/TAP.2022.3168272
M3 - RGC 21 - Publication in refereed journal
SN - 0018-926X
VL - 70
SP - 7843
EP - 7852
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 9
ER -