Abstract
A slot-loaded microstrip patch sensor antenna is proposed to enhance sensitivity in measuring the permittivity of planar materials. A thin rectangular slot was etched along the radiating edge of a rectangular patch antenna fed by a microstrip transmission line. Two resonant frequencies were created at a lower frequency compared to the single resonant frequency of a conventional ordinary patch antenna. The sensitivity of the proposed slot-loaded patch antenna was measured by the shift in the resonant frequency of the input reflection coefficient when the planar dielectric superstrate was placed above the patch, and was compared with that of a conventional patch antenna without the slot. The two antennas were designed and fabricated on a 0.76 mm-thick RF-35 substrate for the first resonant frequency to resonate at 2.5 GHz under unloaded conditions. Five different standard dielectric samples with dielectric constants ranging from 2.17 to 10.2 were tested for sensitivity comparison. The experiment results showed that the measured sensitivity of the proposed patch antenna were 3.54 to 4.53 times higher, compared to a conventional patch antenna, for the five samples.
Highlights
With rapid development of microwave technology, the frequency spectrum used by wireless systems has been considered up to the terahertz frequency band with sub-millimeter wavelengths, and accurate measurement of the permittivity of a material becomes more important for the design of antennas, microwave circuits, and non-destructive monitoring applications [1]
Present a high-sensitivity microstrip patch sensor antenna based on a thin change rectangular loaded edge ofmicrostrip the patch for permittivity measurement
The conventional inset-fed rectangular microstrip patch antenna consisted of a rectangular patch with The a 50-ohm microstrip feed linerectangular recessed inside the patch, andantenna was printed on anof
Summary
With rapid development of microwave technology, the frequency spectrum used by wireless systems has been considered up to the terahertz frequency band with sub-millimeter wavelengths, and accurate measurement of the permittivity of a material becomes more important for the design of antennas, microwave circuits, and non-destructive monitoring applications [1]. The resonant frequency and input impedance characteristics of probe-fed, rectangular, ordinary, and stacked microstrip patch antennas was presented for dielectric measurement when the antennas were loaded with a dielectric material [22]. A real-time wireless vibratory strain sensing system consisting of a microstrip patch antenna strain sensor and a dynamic interrogator using a frequency modulated continuous wave radar has been introduced [33]. Present a high-sensitivity microstrip patch sensor antenna based on a thin change rectangular loaded edge ofmicrostrip the patch for permittivity measurement. Conventional thin rectangular slot loaded along themicrostrip radiation patch edge of the patch permittivity patch antenna of bythe measuring shift in microstrip the resonant frequency of the input reflection coefficient.
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