A Low Profile Differentially Fed Circularly Polarized Antenna for Capsule Endoscopy System
A circularly polarized antenna and differential feeding technology, applied in the field of biomedical telemetry, can solve problems such as corrosion, occupation of capsules, and difficulties in wireless capsule endoscope antennas, so as to avoid energy loss, extend current paths, and realize circular polarization. performance effect
Active Publication Date: 2019-08-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0003] Because it is difficult to design wireless capsule endoscope antennas when passing through the gastrointestinal tract through a variety of digestive tract tissues with different electrical parameters
The volume of a medical capsule is π×(5.5) 2 ×11mm 2 , from the previous work, there are two main types of capsule antennas, one is common to the surface of the capsule, but it is easily corroded by acidic liquids such as gastric juice through the stomach; the other is that the antenna is placed inside the capsule, which can avoid external tissue fluid Corrosion, but occupy a limited space in the capsule, generally require the volume of the antenna design to be as small as possible
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[0023] Figure 1(a) ~ Figure 1(c) As shown, a low-profile differentially fed circularly polarized antenna for a capsule endoscope system includes a metal radiating unit 1, upper and lower dielectric substrates 2A, 2B, and symmetrical coaxials, which include the lower left coaxial Axis 3A, upper right coaxial 3B, floor 4, the metal radiation unit is located in the middle of the two dielectric substrates, the floor is located on the lower surface of the lower dielectric substrate 2B, and the metal radiation unit 1 is a square patch with four corners as arcs Composition, the center of the square patch is slotted and multiple slits are opened around it, and the antenna is respectively simulated in a single-layer muscle model and a human body model.
[0024] The metal radiation unit 1 is a square patch with four corners as arcs, the radius of the arc is 0.5mm, the central angle is 90°, the side length of the square patch is La=7.2mm, and the center of the metal radiation unit 1 is ...
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The invention discloses a low profile differential feed circular polarized antenna for a capsule endoscope system. The antenna comprises a metal radiation unit, an upper layer dielectric substrate, a lower layer dielectric substrate and a floor, wherein the metal radiation unit is positioned between the upper layer dielectric substrate and the lower layer dielectric substrate, the floor is positioned on a lower surface of the lower layer dielectric substrate, and the metal radiation unit is formed by a square paster with four arc-shaped corners. The low profile differential feed circular polarized antenna is advantaged by small size, low profile, wide operation bandwidth, wide axis ratio bandwidth and the like; the low profile differential feed circular polarized antenna is suitable for the field of capsule endoscope systems.
Description
technical field [0001] The invention relates to the field of biomedical telemetry, in particular to a low-profile differential feed circularly polarized antenna for a capsule endoscope system. Background technique [0002] Wireless implantable devices are widely used in medical diagnosis or patient treatment. Implantable devices such as wireless capsule endoscopes and other medical technologies can feed back physiological data in the body to the base station antenna outside the body, and then treat patients according to the transmitted data. Diagnose the condition and formulate a treatment plan. Compared with traditional endoscopy, wireless capsule endoscopy can present a more visualized gastrointestinal tract. However, the use of far-field radio frequency link telemetry for data transmission will be affected by multipath interference effects; at the same time, using linear polarization as the receiving and transmitting antenna, the movement of the patient during the detect...
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IPC IPC(8): H01Q1/38A61B1/00
Inventor 刘雄英李兵
Owner SOUTH CHINA UNIV OF TECH