Soil Moisture Sensor with a Microstrip Band Stop Filter

Felix, Wilson Costa; Oliveira, Alexandre Henrique Soares de; Amorim, Raymundo de; Nobre, Debora Borges; Souto, Leandro de Oliveira; Silva, Victor Emanuel da; Félix, Raquel Aline Araújo Rodrigues

doi:10.1109/wf-iot48130.2020.9221427

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Specifically, the dielectric permittivity is dependent on several intrinsic parameters such as bulk and specific density, and also extrinsic parameters like temperature and volumetrc water content (VWC) causing disturbances on the resonance frequency [13], bandwidth [14], and directivity [15]. This characteristic can indeed be exploited for the sensing functions to capture variations of the parameters mentioned above [16][17][18]. Nevertheless, in scenarios where the underground device doesn't require sensing capabilities, maintaining the stability of the resonant frequency band is crucial.…”

Section: Introductionmentioning

confidence: 99%

A microstrip Antenna for Underground Applications with Frequency Insenitivity to soil moisture variations

MEJJATTI,

Habbani

2024

Preprint

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In this article, we propose a novel design of a buried rectangular patch antenna utilizing the ferromag-netic properties to ensure the resonant frequency resistivity against uctuations in soil permittivity,notably due to variations in its water content. The study initially prioritized determining the idealposition of the ferrite core introduced into the substrate and optimizing the external magnetic eldbias for its application. Subsequently, attention was directed towards evaluating the return loss of thedesigned antenna through simulation under conditions where humidity varies between 0 and 50%. Theresults indicated that the transmitter operates in two di erent modes: ordinary and extraordinary,with the latter maintaining a stable frequency with a deviation rate from the initial one on dry soilnot exceeding 3%, instead of the 50% observed for the former mode. This feature grants it the abilityto be deployable in applications with underground nodes, such as in the case of precision agriculture,without needing to intervene to adjust the operating frequency.

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Section: Introductionmentioning

confidence: 99%

A microstrip Antenna for Underground Applications with Frequency Insenitivity to soil moisture variations

MEJJATTI,

Habbani

2024

Preprint

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“…Microwave sensors designed on their basis are of high interest [14][15][16]. The concept of microwave sensors based on microstrip resonators is based on changes in their frequency response depending on the dielectric permittivity of the samples under test which are considered as an additional dielectric layer [14,[17][18][19][20][21] or are introduced in the cleft of the proposed sensor [16,22].…”

Section: Introductionmentioning

confidence: 99%

The Automatic Design of Multimode Resonator Topology with Evolutionary Algorithms

Stanovov

Khodenkov²,

Popov³

et al. 2022

Sensors

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Microwave electromagnetic devices have been used for many applications in tropospheric communication, navigation, radar systems, and measurement. The development of the signal preprocessing units including frequency-selective devices (bandpass filters) determines the reliability and usability of such systems. In wireless sensor network nodes, filters with microstrip resonators are widely used to improve the out-of-band suppression and frequency selectivity. Filters based on multimode microstrip resonators have an order that determines their frequency-selective properties, which is a multiple of the number of resonators. That enables us to reduce the size of systems without deteriorating their selective properties. Various microstrip multimode resonator topologies can be used for both filters and microwave sensors, however, the quality criteria for them may differ. The development of every resonator topology is time consuming. We propose a technique for the automatic generation of the resonator topology with required frequency characteristics based on the use of evolutionary algorithms. The topology is encoded into a set of real valued parameters, which are varied to achieve the desired features. The differential evolution algorithm and the genetic algorithm with simulated binary crossover and polynomial mutation are applied to solve the formulated problem using the dynamic penalties method. The experimental results show that our technique enables us to find microstrip resonator topologies with desired amplitude-frequency characteristics automatically, and manufactured devices demonstrate characteristics very close to the results of the algorithm. The proposed algorithmic approach may be used for automatically exploring the new perspective topologies of resonators used in microwave filters, radar antennas or sensors, in accordance with the defined criteria and constraints.

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Soil Moisture Sensor with a Microstrip Band Stop Filter

Cited by 2 publications

References 5 publications

A microstrip Antenna for Underground Applications with Frequency Insenitivity to soil moisture variations

A microstrip Antenna for Underground Applications with Frequency Insenitivity to soil moisture variations

The Automatic Design of Multimode Resonator Topology with Evolutionary Algorithms

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