Determination of resonant frequency of slot-loaded rectangular microstrip patch antennas

2009 ◽  
Vol 52 (2) ◽  
pp. 445-448 ◽  
Author(s):  
Dipak Kr. Neog ◽  
Reeta Devi
Keyword(s):  
Resonant Frequency ◽  
Patch Antennas ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch

scholarly journals https://www.ijrte.org/download/volume-8-issue-2/

2019 ◽  
Vol 8 (2) ◽  
pp. 4997-5001
Keyword(s):  
Reflection Coefficient ◽  
Resonant Frequency ◽  
Flexible Substrate ◽  
Flexible Substrates ◽  
Patch Antennas ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Narrow Bandwidth ◽  
Bandwidth Limitation ◽  
Slot Cutting

In this paper, the performance of U-slot Rectangular Microstrip Patch Antennas (RMSA) is analyzed by using different flexible substrates. The RMSA is designed to operate for a resonant frequency of 2.45 GHz with flexible substrate materials like Polydimethylsiloxane (PDMS), GML-1032 and Polyethylene. The antenna parameters like reflection coefficient, voltage standing wave ratio (VSWR), radiation pattern, bandwidth and cost are analyzed by keeping all the substrate height same and the value is 2.5mm. U-slot cutting is used in the patch to overcome the narrow bandwidth limitation in RMSA because U-slot tunes the higher order orthogonal mode resonance frequency of the patch with respect to fundamental mode to realize the wider bandwidth. The maximum bandwidth of 80MHz is achieved with the use of PDMS. The antenna is simulated using HFSS software.

scholarly journals Scattering Parameters Measurements with the Microwave Transmittance Technique Using a Microstrip Patch Antennas, as Non-Invasive Tool for Determination of Soil Moisture

2019 ◽  
Author(s):  
Paulo Sergio de Paula Herrmann ◽  
Felipe Nieves Marques Porto ◽  
Viktor Sydoruk
Keyword(s):  
Soil Moisture ◽  
Electromagnetic Waves ◽  
Plant Root ◽  
Effect Of Temperature ◽  
Patch Antennas ◽  
Non Invasive ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
5 Ghz

Interactions of soil moisture with plant root systems are very important for plant growth. For non-invasive determination of volumetric soil moisture in a rhizobox, a microwave system based on transmittance of electromagnetic waves in the microwave frequency range was developed using microstrip patch antennas. Vector Network Analyzers (VNAs) were used to measure the S-parameters at frequency ranges close to 5 GHz. A transmission system with microstrip patch antennas was developed. The result of this attenuation is in the frequency domain. The antennae were designed as resonant microstrip antennae. The antennae were placed on both sides of a rhizobox, which allowed non-invasive measuring soil moisture in the box. The attenuation (S21(dB)) was used to measure the effect of temperature, and different types of soil; as well as sensitivity, reproducibility and repeatability of the system. In this work we present quantitative results of soil moisture in rhizobox. The microwave technique, using microstrip patch antennas, is a reliable and accurate system, and showed very promising potential applications for rhizobox-based investigations of root performance.

scholarly journals A Simple Model to Compute the Characteristic Parameters of a Slotted Rectangular Microstrip Patch Antenna

Electronics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 129
Author(s):  
Oscar Ossa-Molina ◽  
Francisco López-Giraldo
Keyword(s):  
Resonant Frequency ◽  
Microstrip Antenna ◽  
Patch Antennas ◽  
Characteristic Parameters ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Small Change ◽  
Dominant Resonant Frequency ◽  
Good Agreement ◽  
Strong Agreement

In this study, we developed an analytical model of slot-loaded rectangular microstrip patch antennas based on the simulation results by varying slot parameters. The dominant resonant frequency predicted by such a model is in strong agreement with the experimental results measured at several locations of slot-loaded rectangular microstrip patch antennas. The model enables a reliable and quick computation of the resonant frequency, which generally follows a harmonic behavior that nearly resembles the resonant frequency of a microstrip antenna without a slot, which can be related to a small change in the impedance caused by the slot position. Results showed a good agreement between simulations and measurements for all the slot positions. Mathematical analytic functions to describe the changes in specific characteristic parameters of the slot-loaded rectangular microstrip patch antennas are also included.

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