Improvement study of the reflectivity for hollow pyramidal shape absorbers

Abdullah, Hasnain; Sharif, Juliana Md; Taib, Mohd Nasir; Zanal, Asmalia; Baharudin, Rohaiza; Noordin, Ida Rahayu Mohamed; Jalil, Siti Zura A.; Ali, Wan Khairuddin Wan

doi:10.1109/isiea.2014.8049876

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…A slot is designed to reflect, transmit or absorb EM fields based on the frequency of field [14]- [17]. The pyramidal shape has a minimal working frequency range, which enables good attenuation over broad frequency ranges and angles of incidence [18], [19]. Hence, it provides the optimum performance for microwave absorption.…”

Section: Introductionmentioning

confidence: 99%

The Performance of Hollow Pyramidal Microwave Absorber Using Different Slot Size

Fazin

Abdullah@Idris

Asmadi

et al. 2023

SSP

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Microwave absorber is commonly used in defense, electromagnetic compatibility (EMC)/electromagnetic interference (EMI) reduction and anechoic chamber application. Conventional electromagnetic (EM) absorbers have some constraints in practical handling due to its heavy weight. In this paper, the research focuses on the development of high performance and lightweight microwave absorber. A lightweight and simple design configuration of different rectangular slot size array implemented on hollow pyramidal microwave absorber are carried out. There are two different designs of different slot size array calculated based on 3GHz, 6GHz and 9GHz frequency slot size. The two designs have an opposite slots size array arrangement namely different slot size 3GHz, 6GHz, 9GHz order design array and different slot size 9GHz, 6GHz, 3GHz order design array. The absorption is measured using the Naval Research Laboratory (NRL) arch free space method in the frequency range of 1GHz to 12GHz covering L, S, C and X band. In the measurement result, the maximum absorption performance is obtained by the different slot size 9GHz, 6GHz, 3GHz order design array which is up to -44.23dB at X-band. The measurement results for both designs array show good absorption performance which exhibit below than -20dB especially at high frequency band. The proposed designs have been identified as the new approach to increase absorption improvement over a broad frequency range application.

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Section: Introductionmentioning

confidence: 99%

The Performance of Hollow Pyramidal Microwave Absorber Using Different Slot Size

Fazin

Abdullah@Idris

Asmadi

et al. 2023

SSP

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“…The form of a pyramidal absorber could be solid or hollow in design. Most of the investigations reported earlier involved solid forms but recently, studies on hollow is being carried out since the structures will be beneficial in reducing the overall weight of the absorbing material used within an anechoic chamber facility [23], [24]. The slot array, which comprises of capacitive cells, acts as a capacitor in the low frequency domain but, after the first resonance, its impedance becomes inductive [25].…”

Section: Introductionmentioning

confidence: 99%

Absorption performance of biomass hollow pyramidal microwave absorber using multi-slot array technique

Fazin

Razali

Taib

et al. 2022

IJEECS

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<span>Electromagnetic interference (EMI) is an undesired electromagnetic (EM) wave by nearby electronic devices, process equipment, and measuring instruments. In this work, a novel multi-slot technique is applied to the hollow biomass pyramidal microwave absorber to study its absorption properties thoroughly. Two different slot arrangements in horizontal and vertical configuration are designed for the proposed microwave absorbers. Both slot design concepts have identical shape and size. This work aims to study, compare and analyze the absorption performance of the proposed designs at L, S, C and X frequency bands. The biomass material is used to form as absorbent material. The characteristics performance of the multi-slot design on biomass hollow pyramidal microwave absorbers are measured by using naval research laboratory (NRL) Arch space-free method. The frequency range set up for the measurement is in between 1 GHz to 12 GHz. The multi-vertical slots design exhibits better absorption performance at <br /> C-band and X-band which is -63.67 dB and -46.78 dB respectively while the multi-horizontal slots design provides better absorption performance at <br /> S-band which is -16.92 dB. The results shows that both design performances are frequency-dependent since horizontal slots design improve maximum absorption performance at low frequency while vertical slots design delivers better performance at high frequency. </span>

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“…The radar signature of air, sea and space platforms is normally dominated by electromagnetic scattering from the metal surfaces of the vehicle, including the onboard sensors and payload antennas [1]. Various RCS reduction (RCSR) techniques are available to suppress backscatter from the host vehicle, such as geometrical shaping and the usage of new absorbent materials [2][3][4]. However, these cannot be used to electromagnetically cloak high gain antennas composed of metal-backed arrays of radiating elements such as dipoles, helices, slots and microstrip patches.…”

Section: Introductionmentioning

confidence: 99%

Frequency selective superstrate absorber for wideband RCS reduction of metal‐backed antennas

Machado

Cahill

Fusco

et al. 2021

IET Microwaves Antenna & Prop

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The use of a resistively loaded frequency selective surface (FSS) superstrate is reported as a means to reduce the radar cross‐section (RCS) of metal‐backed antennas. The design methodology is demonstrated by creating a low‐profile absorber which exhibits a transmission window covering the working frequency band (10–10.2 GHz) of a 4 × 4 microstrip patch array. Placing the structure λ/2 above the radiating aperture is shown to reduce the antenna gain by less than 2 dB and have minimal impact on the shape of the beams which are directed at 0° and tilt angles of 22.5° and 45°. Moreover 90% radar backscatter suppression is achieved over 92% of the frequency range 8.85–24 GHz. The perforated metal‐backed FSS superstrate was inkjet printed on a 140 μm thick polyethylene terephthalate (PET) sheet and the conductivity of the silver plating adjusted to achieve the required 40 Ω/sq surface resistance. The experimental results obtained for the standalone microwave absorber, and when integrated with the antenna, are shown to be in close agreement with the computed reflectivity and far field patterns.

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Improvement study of the reflectivity for hollow pyramidal shape absorbers

Cited by 4 publications

References 2 publications

The Performance of Hollow Pyramidal Microwave Absorber Using Different Slot Size

The Performance of Hollow Pyramidal Microwave Absorber Using Different Slot Size

Absorption performance of biomass hollow pyramidal microwave absorber using multi-slot array technique

Frequency selective superstrate absorber for wideband RCS reduction of metal‐backed antennas

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