visitant ::
identificació
|
|||||||||||||||
Cerca | Lliura | Ajuda | Servei de Biblioteques | Sobre el DDD | Català English Español |
Pàgina inicial > Articles > Articles publicats > Toward a low-cost portable reader for reflective-mode microwave sensors |
Data: | 2024 |
Resum: | Microwave sensors are typically characterized using a vector network analyzer (VNA) that measures the scattering parameters of the device under test (DUT) over a wide frequency band with great accuracy. However, these features of the VNA are not always required, and its bulky form factor and high cost can even be a limitation in many practical scenarios, such as microwave sensors, which are generally characterized by low cost, a small footprint, and often planar profiles. This article presents a novel, low-cost portable reader for reflective-mode microwave sensors. The proposed device is based on a hybrid 180° directional coupler that separates the input signal from the reflected one, a voltage-controlled oscillator (VCO) to generate the input signal, and a gain/phase detector board. The performance of the proposed system has been experimentally assessed for reference load cases, showing a good match between the simulated and measured results. The capability and usefulness of the proposed device are demonstrated through the implementation of a reflective-mode distance sensor where the input impedance of the one-port sensing element is the output variable of interest. The results obtained with the proposed reader well match the VNA measurements, with a mean error of about 8%. It is worth noting that the presented solution can be easily adopted as the measurement device by other reflective-mode sensors operating in the frequency band of the coupler. Overall, the proposed novel reader offers a new approach to measuring the output variable of one-port reflective-mode microwave sensors that is battery-powered, portable, versatile, accurate, and cost-effective compared with using a VNA. |
Ajuts: | Agencia Estatal de Investigación PDC2021-121085-I00 Agencia Estatal de Investigación PID2019-103904RB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00192 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Distance sensor ; Hybrid coupler ; Microwave sensor ; Reflective-mode sensor ; Spiral resonator (SR) |
Publicat a: | IEEE transactions on instrumentation and measurement, Vol. 73 (2024) , art. 8000309, ISSN 0018-9456 |
Disponible a partir de: 2026-03-30 Postprint |