Design of a Novel Compact Cup Feed for Parabolic Reflector Antennas

Moallemizadeh, Amir; Sarraf-Shirazi, Reza; Bod, Mohammad

doi:10.2528/pierl16100501

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…For the next example, the proposed hybrid Tikhonov SRM is evaluated with the measured NF data. Therefore, the NF data of a grid reflector antenna with a backed cup feed, which is introduced in [18], is measured at 1.1 GHz. The antenna configuration is shown in Fig.…”

Section: Reflector Antenna Measurementmentioning

confidence: 99%

Hybrid Tikhonov source current reconstruction method for large‐scale problems

Bod

Sarraf

Moradi

et al. 2017

IET Microwaves, Antennas & Propagation

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Source current reconstruction method (SRM) is a field transformation technique in which the equivalent currents at the antenna aperture are reconstructed from the known radiated fields. To stabilise SRM equations and reduce the effect of measurement errors and noise, the Tikhonov SRM has been frequently used. However, finding the regularisation parameter and solving the Tikhonov SRM equation have a high computational cost especially for large‐scale problems or in the presence of both electric and magnetic currents. Here, a hybrid regularised least‐square minimum residual (LSMR) technique is proposed to implement the Tikhonov SRM equation. In this method, the Tikhonov SRM is applied on the Krylov subspace that is created by the LSMR iterative solver. The regularisation parameter of the hybrid Tikhonov equation is determined at each iteration of the projected problem with the generalised cross‐validation method. Results of current reconstruction and near‐field/far‐field transformation with the proposed hybrid Tikhonov SRM are reported in this study and compared with the standard Tikhonov SRM. It is shown in both simulation and measurement examples that a significant improvement in the computational cost is realised with the proposed hybrid method while all of the benefits of the traditional method are preserved.

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Section: Reflector Antenna Measurementmentioning

confidence: 99%

Hybrid Tikhonov source current reconstruction method for large‐scale problems

Bod

Sarraf

Moradi

et al. 2017

IET Microwaves, Antennas & Propagation

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Unidirectional Antenna for Disease Detection Purpose

Mustafa

Idrus

2020

J. Phys.: Conf. Ser.

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A brain tumor is defined as a mass of tissue formed by an accumulation of abnormal cells within the brain. This paper proposes a high gain ultra-wideband (UWB) reflector array antenna for cancer detection. Introduction of the copper reflector with ideal distance contribute to increasing the proposed antenna gain. The antenna is printed with 4×1 copper radiating patch array properly connected with quarter wave transformer transmission line associated with a copper parasitic element for the front side. The patches comprise of four identical circulars with a diameter of 15 mm. Parasitic element is placed on very close to feeding line with the gap only 0.2 mm. Each quarter wave transmission line has its own specific wide dimension for 50Ω, 70.71Ω and 100Ω to ensure equal current distribution towards all four patches could be realized. Quarter-wave transformers of 70.71 Ω are used to have an ideal match between the 100 Ω lines and the 50 Ω lines. The high gain antenna is essential in a human microwave detection system for penetrating the multilayer structures by enhancing the focus of the electromagnetic energy into the desired structure. The antenna with reflector recorded wider bandwidth; 1.6 GHz-10.8 GHz associated with higher gain ranged from 3.2 dB until 14.1 dB compared with an antenna without reflector operated from 2.2 GHz to 10.8 GHz with lower gain ranges of 2.1 dB to 10.2 dB.

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Tumor Detection via Specific Absorption Rate Technique Using Ultra-Wideband Antenna

Jamlos

Mustafa

Khairunizam

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper proposes high gain ultra-wide band (UWB) reflector array antenna for human brain tumor detection using specific absorption rate (SAR) technique in microwave detection system. Introduction of copper reflector with ideal distance contribute in increasing the proposed antenna gain. High gain antenna is essential in human microwave detection system for penetrating the multilayer structures by enhancing the focus of the electromagnetic energy into the desired structure. The antenna with reflector recorded wider bandwidth; 1.6 GHz-10.8 GHz associated with higher gain ranged from 3.2 dB until 14.1 dB compared with antenna without reflector operated from 2.2 GHz to 10.8 GHz with lower gain ranges of 2.1 dB to 10.2 dB. The antenna is successfully detecting human brain tumor based on SAR technique. Amount of energy or gain produced by the antenna which being absorbed by the human brain indicated the present of tumor inside. Human brain with tumor absorbed more energy and recorded higher SAR value compared to human brain without tumor. In this paper, human head phantom associated with tumor recorded SAR value of 2.53 W/kg and 2.51 W/kg for simulated and measured respectively meanwhile head phantom without tumor stated SAR value of 1.06 W/kg for simulated and 1.05 W/kg for measured. The biggest different in SAR value according to area precisely determine the location of the tumor in the brain which in this case position 5 (tumor location) resulted biggest SAR different value of 1.47 W/Kg for simulated and 1.46 W/Kg for measured.

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Design of a Novel Compact Cup Feed for Parabolic Reflector Antennas

Cited by 3 publications

References 9 publications

Hybrid Tikhonov source current reconstruction method for large‐scale problems

Hybrid Tikhonov source current reconstruction method for large‐scale problems

Unidirectional Antenna for Disease Detection Purpose

Tumor Detection via Specific Absorption Rate Technique Using Ultra-Wideband Antenna

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