Journal: Sensors (Basel, Switzerland)

Article Title: Small Split-Ring Resonators as Efficient Antennas for Remote LoRa IOT Systems—A Path to Reduce Physical Interference

doi: 10.3390/s21237779

Figure Lengend Snippet: The effect of rotation on the reflection coefficient measured by the monopole interaction with nearfield SRR antenna. The x-axis is parallel to the monopole, with the outer split upward and in plane of the SRR at θ x = 0 , θ y = 0 , a n d θ z = 0 —see . Spectra from a 433 MHz antenna design when rotated ( a ) about the x-axis θ x ( θ y = 0 , θ z = 0 ) and ( b ) the peak reflection coefficient rotated about θ x . ( c ) Spectra when rotated about the y-axis θ y ( θ x = 0 , θ z = 0 ) and ( d ) the peak reflection rotated about θ y . ( e ) The peak reflection value rotated about θ z ( θ x = 0 , θ y = 0 ) with the xy-plane aligned to the monopole (z-axis normal to the monopole). The general fit is overlaid as a dash line.

Article Snippet: The angular dependence of SRR antennas from nearfield measurements above a ground plane was also measured in the current work to compliment the findings of the farfield range tests, which did not include a ground plane.

Techniques: