This article presents the enhancement of bandwidth for rectangular slot antenna with an H and T-shaped slot tuning. The bandwidth was increased from the original antenna by using the T-shaped slot tuning technique and adding the tuning stubs on the both sides of ground plane. The proposed antenna can be applied to ultra-wideband frequency range between 3.1 -10.6 GHz based on the IEEE 802.15.3a standard with compact antenna dimension of 30×35 mm 2 . In designing the antenna, the simulation software, CST Microwave Studio, was used to study and analyze various parameters and characteristics. The simulation and measurement results were agreed fairly well and they showed that the impedance bandwidth was about 130.49% (2.82 -13.41 GHz) which was increased from the original antenna by 53.35%, with the average gain of 4.76 dBi possessing bi-directional radiation pattern.
This article presents the design of a dipole antenna structure in combination with a square electromagnetic band gap (EBG) to monitor the children trapped in cars using a 750 MHz frequency band which responds the most to human movement detection. The antenna structure was designed on a copper plate with a thickness of 0.297 mm and polyester mylar film baseplate with a thickness of 0.3 mm and dielectric value of 3.2. By design, the dipole antenna had a size of 201.56 × 12.5 mm 2 and 18 × 5 units square electromagnetic band gap (EBG) of size 254.64 × 71.86 mm 2 . The results of the measurement showed that the bandwidth impedance in the operating frequency range was 4.78% (735-771 MHz) with a gain of 6.3 dBi. There was an omnidirectional signal transmission. The dipole antenna had the best distance between the EBG plates of 30 mm. When being examined at a distance of 500-1,600 mm, it was the most effective at an average signal strength of approximately 0.032 mW every time there was movement of a human body in the car.
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