24 GHz Flexible Antenna for Doppler Radar based Human Vital Signs Monitoring
| aut.embargo | No | en_NZ |
| aut.filerelease.date | 2022-02-05 | |
| aut.thirdpc.contains | No | en_NZ |
| dc.contributor.advisor | Seet, Boon-Chong | |
| dc.contributor.author | Kathuria, Nitin | |
| dc.date.accessioned | 2021-02-05T02:29:32Z | |
| dc.date.available | 2021-02-05T02:29:32Z | |
| dc.date.copyright | 2021 | |
| dc.date.issued | 2021 | |
| dc.date.updated | 2021-02-05T02:15:35Z | |
| dc.description.abstract | Noncontact monitoring of human vital signs is an emerging research topic in recent years. A key approach to this monitoring is the use of the Doppler radar concept which enables real-time vital signs detection, resulting in a new class of radar system known as bio-radar. Unlike traditional techniques that use contact electrodes for vital sign measurement, bio-radar is non-intrusive and less perturbing for infants and patients with critical injuries. The bio-radar can even detect life under rubble in the aftermath of disasters. The antennas are a key component of any bio-radar module and their designs should meet the common requirements of bio-radar applications such as high directivity, circularly polarized, and flexibility. This thesis presents the design of a 24 GHz four-element antenna array on a low-cost and flexible liquid crystal polymer (LCP) substrate with a thickness of only 100 m, low-loss tangent (tan=0.0021), stable dielectric constant (r=3.35) and low moisture permeability. The designed antenna array can be used with a bio-radar for vital signs monitoring in a non-contact manner. To the best of our knowledge, the design of flexible antenna arrays for bio-radar and the use of LCP for such applications have not been explored in literature. Any antenna array will require a unit element to be designed first. The unit element was designed with an input impedance of 50 Ω on LCP substrate, which is then used to construct a two- and four-element array with an overall dimension of 29.5×25.4 mm, and 5336.5 mm, respectively. The simulated gain obtained is 4.39 dB, 5.46 dB, and 6.68 dB for unit cell, two-element array, and four-element array, respectively. Other measured and simulation results showed close agreement. The two vital signs: breathing rate (BR) and heart rate (HR) of two human subjects are detected with relatively good accuracy using the fabricated antenna arrays and RF output power of -3 dBm from a distance of approximately 60 cm. | en_NZ |
| dc.identifier.uri | https://hdl.handle.net/10292/13968 | |
| dc.language.iso | en | en_NZ |
| dc.publisher | Auckland University of Technology | |
| dc.rights.accessrights | OpenAccess | |
| dc.subject | Flexible | en_NZ |
| dc.subject | Antenna | en_NZ |
| dc.subject | LCP | en_NZ |
| dc.subject | Vital Sign | en_NZ |
| dc.title | 24 GHz Flexible Antenna for Doppler Radar based Human Vital Signs Monitoring | en_NZ |
| dc.type | Thesis | en_NZ |
| thesis.degree.grantor | Auckland University of Technology | |
| thesis.degree.level | Masters Theses | |
| thesis.degree.name | Master of Engineering | en_NZ |