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This paper presents a novel structure of frequency reconfigurable truncated rhombus-like slotted antenna (FRTRSA). The structure consists of a slotted ground plane with a thickness of ho sandwiched between two different substrates of different thicknesses, h1 and h2. The upper substrate has lower dielectric constant, erl than the bottom substrate, er2. Unlike a conventional antenna which provides...
This paper presents a novel design of aperture coupled microstrip antenna (ACMSA) integrated with DGS and parasitic elements. The basic design of the proposed antenna is 2 by 2 planar array with aperture coupler feeding technique. Four dumbbell-shaped DGS are etched on the ground plane, for back radiation reduction, which is sandwiched between the upper and lower substrates. Both of the substrates...
This paper presents a novel of a Reconfigurable Stacked Patch Microstrip Array Antenna (RSPMAA) integrated with radio frequency (RF) switches at the feedline. The antenna uses a combination of aperture coupled technique and stacked patch technology for reducing spurious radiation patterns. Generally, this RSPMAA consist of three substrate layers (RT-Rogers 5880) and an air filled substrate between...
This paper presents a novel design of aperture coupled microstrip antenna with back lobe reduction. The proposed design was based on the structure of a 2 by 2 planar array antenna with separated feeding technique, aperture coupler. The antenna is designed on Rogers Duroid substrate having dielectric, ε, of 2.2. Four dumbbell shaped DGS were etched on the ground plane for back radiation reduction....
A compact Ultra Wideband (UWB) microstrip antenna consists of a circular patch added with a three different length of open-end stub loaded Wing and partial ground plane with dumbbell shape defected ground structure (DGS) is proposed in this paper. This antenna was an improvement from the previous research, marked size reduction of 25% of the antenna size with comparable performance. The introduction...
A novel design of frequency reconfigurable microstrip array antenna (FRMAA) using aperture coupler feeding technique is presented. In contrast with conventional antennas that can be operated at one frequency in a single antenna, this FRMAA is capable to operate at two different frequencies. In this paper, the ground plane which is located in the middle of the two substrates serves as a very effective...
This paper presents a design of aperture coupled microstrip antenna integrated with EBG. The proposed design was based on structure of 2 by 2 planar array with aperture coupled feeding technique. Mushroom-like EBG were integrated onto the antenna to investigate its effect to the antenna. Optimization on number of EBG patches and the spacing gap distance between EBG patches were carried out. The antenna...
In this paper, the Frequency Reconfigurable Stacked Patches Microstrip Antenna (FRSPMA) fed by aperture coupler technique is presented. The antenna is designed using C-Foam as a dielectric substrate for different stacked patches and FR-4 material for feedline substrate. One RF switch is integrated at the feedline to control the activation patches and aperture slots during ON and OFF states. During...
This paper presents a novel design of a Frequency Reconfigurable Stacked Patch Microstrip Antenna (FRSPMA) by using an aperture coupler as the feeding technique and stacked technology. The proposed antenna was capable to accommodate at S/X band separately by using the same antenna. Two patches at different substrate are activated sequentially by changing the switch mode at the feedline to achieve...
This paper presents the design of Ultra Wideband (UWB) microstrip antenna consisting of a circular monopole patch antenna with 3 block stepped (wing). The antenna design is an improvement from previous research and it is simulated using CST Microwave Studio software. This antenna was designed on Rogers 5880 printed circuit board (PCB) with overall size of 26 × 40 × 0.787 mm3 and dielectric substrate,...
Introduction: To study the ß‐gene mutations spectrum, the genotype/phenotype correlation, the modulatory effect of co‐inherited factors such as α‐gene mutations and of Xmn1 polymorphism in a large cohort of Malaysian patients.
Methods: A total of 264 cases clinically diagnosed as Thalassemia major (TM) (111), Thalassemia intermedia (21), HbE‐β Thalassemia (131), and 1 HbE homozygous were studied...
An Ultra Wideband (UWB) microstrip antenna consisting of a circular monopole patch with stepped feedline, with a 10dB return loss bandwidth from 3.50 to 11.20 GHz and maximum VSWR of 1.07 is proposed. This antenna was designed on Rogers 5880 printed circuit board (PCB) with overall size of 31.17 × 40 × 0.787 mm3 and dielectric substrate εr = 2.2. This antenna operated at UWB frequency and it designed...
This paper presents a design of 2 by 2 planar array microstrip antenna with a non-contacting feed. The type of non-contacting feeding used is aperture coupler technique. The antenna is basically consists of two layer of substrates which called superstrate and substrate. Patches are printed on top of the superstrate while the feed line is located on the bottom of the substrate. The antenna is designed...
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