Microwave Signal Propagation on Oil Palm Trees: Measurements and Analysis

Rizman, Zairi Ismael; Jusoff, Kamaruzaman; Rais, Siti Sara; Bakar, H. H. H.; Nair, Gopala Krishnan Sekharan; Ho, Yeap Kim

doi:10.21307/ijssis-2017-446

Cited by 10 publications

(8 citation statements)

References 12 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the features of LoRa is its ability to perform well in a multipath channel that the signal can still be received even after it passed through two or more walls of buildings. Besides, low frequencies provide great penetration of brick walls, trees and concretes so these frequencies usually have less loss than high frequency bands [11]. Hence, the NLOS test was setup in suburban environment where the signal strength where measured after it passed through a K. A.…”

Section: K a Ahmad Et Al J Fundam Appl Sci 2017 9(3s) 384-394 391mentioning

confidence: 99%

LoRa propagation at 433 MHz in tropical climate environment

Ahmad

Segaran

Hashim

et al. 2018

J. Fundam and Appl Sci.

View full text Add to dashboard Cite

Section: K a Ahmad Et Al J Fundam Appl Sci 2017 9(3s) 384-394 391mentioning

confidence: 99%

LoRa propagation at 433 MHz in tropical climate environment

Ahmad

Segaran

Hashim

et al. 2018

J. Fundam and Appl Sci.

View full text Add to dashboard Cite

“…6 shows the result of the signal transmission, S 21 Then, to further investigate the performance of the absorber, the absorption rate (AR) as in Equation (3) was calculated based on the optimum results of S 11 and S 21. It was observed that the absorption rate for OPFPLA was 12.12% and EFBPLA has AR of 9.69%.…”

Section: E Baharudin Et Al J Fundam Appl Sci 2017 9(3s) 335-348 341mentioning

confidence: 99%

“…Hence, the necessity for the absorber to work in microwave [21] frequencies has become great concern especially in the application of military radar stealth for the prevention of electromagnetic energy [2].…”

Section: Introductionmentioning

confidence: 99%

“…Another important parameter of an absorber is the percentage of absorption rate (AR) and this is a frequency dependent parameter. When electric field of a specific frequency hits a surface of a medium, there will a reflected signal S 11 and transmitted signal S 21 . Therefore, based on these conditions, the reflectance and transmittance factor can be denoted as the S parameter properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigate of wave absorption performance for oil palm frond and empty fruit bunch at 5.8 GHz

Baharudin

Ismail

Alhawari

et al. 2018

J. Fundam and Appl Sci.

View full text Add to dashboard Cite

Low cost composites made from oil palm agricultural wastes showed much interest for absorber applications. In this work, dielectric properties of oil palm frond/PLA and empty fruit bunch/PLA which consists of 30%wt, S-parameter Reflection Method and the microwave absorbers were design using CST at 5.8GHz. The absorber thickness was varied to observe the reflection and transmission performance between 2 to 8 GHz. In addition, the Absorption Rate Figure

show abstract

“…Empirical models based on measurement results can be included as parameters of such a model. The empirical models of [16]- [22] are widely used against specific measurements results. Recent measurements are mainly for the so-called 5G bands, which are higher frequencies than the 1GHz measurements [23] of interest for this paper.…”

Section: Introductionmentioning

confidence: 99%

Simplifying Through-Forest Propagation Modelling

Zabihi

Vaughan

2020

IEEE Open J. Antennas Propag.

View full text Add to dashboard Cite

Propagation analysis and modeling is critical for radio systems design, but remains a challenge for most throughvegetation situations, including forests. Transmission through such inhomogeneous mixed media is complicated by the many different propagation mechanisms and the complexity of the randomness. This means that accurate, purely physics-based analysis is unlikely to be practical (conveniently computed), and similarly, that practical, purely random modeling is unlikely to be accurate. Through-vegetation propagation models, including the standard radiative energy transfer (RET), are not very accurate in the sense that the uncertainty can be tens of dB, and this seems to be an accepted limitation for vegetation. A simpler propagation model, which maintains or improves accuracy, but keeps a reasonable association with the physics, would be insightful. This paper discusses such a model. It comprises two parallel transmission mechanisms: direct transmission through a succession of trees, which is modeled by a simple linear transmission line; and transmission across the forest top, which is modeled by simplified multiple-edge diffraction. The model is examined using recently-published experiments over a long path-length. It is demonstrated that this two-mechanism model can provide an accurate fit to the dual-slope profile of throughforest propagation over a long distance which is not possible with the RET model.

show abstract

Microwave Signal Propagation on Oil Palm Trees: Measurements and Analysis

Abstract: Abstract-This paper presents the study of microwave signal attenuation on oil palm trees at 0.9 GHz, Further studies on other types of vegetation and environments, and its seasonal differences are important as future research.

Cited by 10 publications

References 12 publications

LoRa propagation at 433 MHz in tropical climate environment

LoRa propagation at 433 MHz in tropical climate environment

Investigate of wave absorption performance for oil palm frond and empty fruit bunch at 5.8 GHz

Simplifying Through-Forest Propagation Modelling

Contact Info

Product

Resources

About