Md. Amanath Ullah

A 3D directive microwave antenna for biomedical imaging application

A directive three dimensional antenna, using folded radiating structure has been presented for the application of microwave imaging in clinical diagnosis. Two reflector walls have been introduced to achieve higher gain and directive radiation pattern along with the folding technique. The shorting wall technique is utilized to reduce the overall antenna size and to get resonance at a lower frequency. The proposed antenna obtained operating band at 1.67 GHz to 1.74 GHz. The dimension of the 3D radiating structure is 40£25£10.5 mm3. The antenna has an average realized gain of 5.2 dBi. Owing to the unidirectional radiation pattern, high gain and operating bandwidth within lower microwave frequency, the proposed antenna has potential to be used in microwave imaging for biomedical diagnosis. Also, the antenna has been utilized to compute an imaging phenomenon to detect abnormality in human head and result is presented. The design and simulation process are performed in the CST Microwave Studio software. The antenna is fabricated from 0.2 mm thick copper sheets. The results of the fabricated antenna are measured using PNA Network Analyzer (N5227A) and Satimo Star Lab.

A compact triangular shaped microstrip patch antenna with triangular slotted ground for UWB application

This paper is aimed to present a very small sized patch antenna for UWB applications. The antenna used microstrip feed-line. This antenna is very small in dimension. The total size of the antenna is 20×18mm2. Triangular slots in the partial ground plane, are used to get a better bandwidth. The antenna has VSWR<2 over the bandwidth. The whole designing and simulation process of the antenna is done by CST Microwave Studio software.

A Solar Panel-Integrated Modified Planner Inverted F Antenna for Low Earth Orbit Remote Sensing Nanosatellite Communication System

One of the most efficient methods to observe the impact of geographical, environmental, and geological changes is remote sensing. Nowadays, nanosatellites are being used to observe climate change using remote sensing technology. Communication between a remote sensing nanosatellite and Earth significantly depends upon antenna systems. Body-mounted solar panels are the main source of satellite operating power unless deployable solar panels are used. Lower ultra-high frequency (UHF) nanosatellite antenna design is a crucial challenge due to the physical size constraint and the need for solar panel integration. Moreover, nanosatellite space missions are vulnerable because of antenna and solar panel deployment complexity. This paper proposes a solar panel-integrated modified planner inverted F antenna (PIFA) to mitigate these crucial limitations. The antenna consists of a slotted rectangular radiating patch with coaxial probe feeding and a rectangular ground plane. The proposed antenna has achieved a −10 dB impedance bandwidth of 6.0 MHz (447.5 MHz–453.5 MHz) with a small-sized (80 mm× 90 mm× 0.5 mm) radiating element. In addition, the antenna achieved a maximum realized gain of 0.6 dB and a total efficiency of 67.45% with the nanosatellite structure and a solar panel. The challenges addressed by the proposed antenna are to ensure solar panel placement between the radiating element and the ground plane, and provide approximately 55% open space to allow solar irradiance into the solar panel.

A Reflector Type 3D Triband Directional Antenna for CubeSat Applications

In this paper, a three-dimensional antenna for CubeSat applications is proposed. The proposed antenna achieved unidirectional radiation characteristics at its operating bands. Different optimization techniques such as a folded radiating structure, shorting wall and ground reflector are used to achieve a standard performance from the antenna. The proposed antenna successfully achieved three operating bands: 1.55–1.67 GHz, 1.99–2.27 GHz and 2.53–3.58 GHz. A front-to-back ratio of 15 authenticates its directive radiation pattern. The proposed antenna achieved a peak gain of 4 dB. The antenna has been designed in such a way that it can be fabricated for mass production easily from a single copper sheet using folding technique. Computer Simulation Technology (CST) Microwave Studio software has been used to design and perform the simulation work. A lower operating band, unidirectional radiation characteristics, and a satisfactory amount of gain over the operating frequency make the antenna a candidate to be used in CubeSats for space communication purposes.

Specific absorption rate (SAR) analysis using plastic substrate based negative indexed metamaterial shielding

In this paper, a lower band negative index metamaterial is developed for specific absorption rate reduction. The proposed metamaterial is printed on the plastic cover body of the wireless device. The metamaterial structure has been designed and characterized using FIT technique based EM simulator CST Microwave studio. The perceptible outcome of this paper is specific absorption reduction using plastic substrate based metamaterial structure.

Mathematical characterization of coupled Pi-shaped DNG metamaterial structure

In this paper, a coupled Pi-shaped double negative metamaterial has been validated using two established retrieval methods: Nicolson-Rose-Weir method and Transmission-Reflection Method. The proposed unit cell was designed on a Rogers RO3010 substrate with dielectric constant of 10.2 and a thickness of 1.28 mm. The simulation has been performed under commercially available CST Microwave Studio environment. The proposed structure has been achieved DNG characteristics at 7.89 GHz. The effective parameters of the proposed structure have been retrieved using MATLAB for both TR and NRW methods and compared the results.