_{1}

Wireless communication industry is in rapid growth in the last years. Due to the huge progress in development of communication systems in the last decade development of wideband communication systems is continuous growth. However, development of wideband efficient antennas is one of the major challenges in development of wideband wireless communication systems. Low cost compact antennas are crucial in the development of communication systems. Printed notch antennas and miniaturization techniques are employed to develop efficient compact notch antennas. Fractal technology is used to improve the electrical performance and efficiency of notch antennas. Design tradeoffs, computed and measured results of wideband notch antennas with high efficiency are presented in this paper. All antennas are analyzed by using 3D full-wave software. The paper presents new compact Ultra-Wideband notch antenna 1 GHz to 6 GHz, a wideband notch antenna 2.1 GHz to 7.8 GHz and a 5.8 GHz to 18 GHz fractal notch antenna.

This paper is a research on new wideband notch antennas for communication systems. Compact printed antennas are crucial in the development of communication systems. However, compact printed antennas suffer from narrow bandwidth and low efficiency. Fractal technology is used to improve the electrical performance and efficiency of notch antennas. Design tradeoffs, computed and measured results of wideband notch antennas with high efficiency are presented in this paper. The paper presents new compact ultra-wideband notch antenna 1 GHz to 6 GHz and a wideband notch antenna 2.1 GHz to 7.8 GHz. A fractal antenna is an antenna that uses antenna design with similar fractal segments to maximize the antenna effective area. Fractal antennas are also referred as multilevel structure with space filling curves. The key aspect lies in a repetition of a motif over two or more scale sizes or “iterations”. Fractal antennas are very compact, multiband or wideband, and have useful applications in cellular telephone and microwave communications. Several fractal antennas are presented in books, papers and patents, see [

Fractal geometries may be applied to design antennas and antenna arrays. The advantages of printed circuit technology and printed antennas enhance the design of fractal printed antennas and microwave components. The effective area of a fractal antenna is significantly higher than the effective area of a regular printed antenna. Fractal antenna may operate with good performance at several different frequencies simultaneously. Fractal antennas are compact multiband antennas. Directivity of fractal antennas is usually higher than directivity of a regular printed antenna. The number of element in a fractal antenna array may be reduced by around a quarter of the number of elements in a regular array. A fractal antenna could be considered as a non-uniform distribution of radiating elements. Each of the elements contributes to the total radiated power density at a given point with a given amplitude and phase. By spatially superposing these line radiators we can study the properties of a fractal antenna array.

A wideband notch antenna with fractal structure has been designed. The antenna is printed on RT-DUROID 5880 dielectric substrate with dielectric constant of 2.2 and 1.2 mm thick. The notch antenna is shown in

A wideband notch antenna with fractal structure has been designed. The antenna is printed on RT-DUROID 5880 dielectric substrate with dielectric constant of 2.2 and 1.2 mm thick. The notch antenna is shown in

A wideband notch antenna has been designed. The antenna is printed on RT-DUROID 5880 dielectric substrate with dielectric constant of 2.2 and 1.2 mm thick. The notch antenna is shown in

By using fractal structure the notch antenna length and width was reduced by around 50%.

A wideband notch antenna with fractal structure has been designed. The antenna is printed on RT-DUROID 5880 dielectric substrate with dielectric constant of 2.2 and 1.2 mm thick. The notch antenna is shown in

The antenna matching network was optimized to get better S11 results at 16 GHz to 18 GHz. The length and width of the stubs were tuned to get better S11 results at 16 GHz to 18 GHz.

The paper presents new compact ultra-wideband notch antenna 1 GHz to 6 GHz and a wideband notch antenna 5.8 GHz to 18 GHz. Space filling technique and Hilbert curves are employed to design the fractal notch

antennas. The fractal notch antennas are analyzed by using 3D full-wave software. The antenna bandwidth is around 100% with VSWR better than 3:1. The antenna gain is around 3.5 dBi with efficiency higher than 90%. By using fractal structure, the notch antenna length and width can be reduced by up to 50%.

Albert Sabban, (2016) New Wideband Notch Antennas for Communication Systems. Wireless Engineering and Technology,07,75-82. doi: 10.4236/wet.2016.72008