Wei-Chung Weng

Linear Antenna Array Synthesis Using Taguchi's Method: A Novel Optimization Technique in Electromagnetics

We describe a new global electromagnetic optimization technique using Taguchis method and apply it to linear antenna array design. Taguchis method was developed on the basis of the orthogonal array (OA) concept, which offers systematic and efficient characteristics. This paper illustrates the implementation procedure of Taguchis method in electromagnetic optimization problems. The optimization procedure is then used to design two linear antenna arrays with specific array factor requirements. Obtained results show that the desired null controlled pattern and sector beam pattern are successfully achieved. Compared to traditional optimization techniques, Taguchis method is easy to implement and efficient to reach the optimum solutions

Electromagnetics and Antenna Optimization using Taguchi's Method

This book presents a new global optimization technique using Taguchi’s method and its applications in electromagnetics and antenna engineering. Compared with traditional optimization techniques, Taguchi’s optimization method is easy to implement and very efficient in reaching optimum solutions. Taguchi’s optimization method is developed based on the orthogonal array (OA) concept, which offers a systematic and efficient way to select design parameters. The book illustrates the basic implementation procedure of Taguchi’s optimization method and discusses various advanced techniques for performance improvement. In addition, the integration of Taguchi’s optimization method with commercial electromagnetics software is introduced in the book. The proposed optimization method is used in various linear antenna arrays, microstrip filters, and ultra-wideband antenna designs. Successful examples include linear antenna array with a null controlled pattern, inear antenna array with a sector beam, linear antenna array with reduced side lobe levels, microstrip band stop filter, microstrip band pass filter, coplanar waveguide band stop filter, coplanar ultra-wide band antenna, and ultra-wide band antenna with band notch feature. Satisfactory results obtained from the design process demonstrate the validity and efficiency of the proposed Taguchi’s optimization method. Contents: Introduction / Orthagonal Arrays / Taguchis Optimization Method / Linear Antenna Array Designs / Planar Filter Designs / Ultra-wide Band (UWB) Antenna Designs / OA-PSO Method / Conclusions

Optimal Design of CPW Slot Antennas Using Taguchi's Method

In this study, a one-element coplanar-waveguide (CPW) slot antenna and a two-element series aperiodic CPW slot antenna array are optimized by Taguchis method, in conjunction with a full-wave simulator to analyze the antennas, to achieve the desired goals. As a comparison, particle swarm optimization (PSO) is also used to design the two antennas. Optimization results show that the desired frequency responses of the antenna are successfully achieved by the two approaches. The optimization results from the Taguchis method significantly outperformed the PSO method in these two slot-antenna configurations.

A Dual-Broadband Circularly Polarized Slot Antenna for WLAN Applications

A novel dual-band, circularly polarized slot antenna with broadband characteristics in both axial ratio and impedance is developed. The radiations of antenna exhibit a left-hand circular polarization in the z > 0 direction and a right-hand circular polarization in the opposite direction at both the lower and upper bands. The measured impedance bandwidths are 55.33% (1.83-3.23 GHz) and 20.98% (4.99-6.16 GHz) while the axial ratio bandwidths are 32.14% (1.88-2.60 GHz) and 31.49% (4.95-6.80 GHz) at the lower and upper bands, respectively. In comparison to the recent works, the proposed antenna has a simpler structure, a more compact size, wider impedance bandwidths, and wider axial ratio bandwidths.

An H-Fractal Antenna for Multiband Applications

An H-fractal used for a multiband antenna is presented. The H-fractal planar antenna has been fabricated on an FR4 substrate with a 1.6-mm thickness. The proposed antenna can excite multiple resonances with reasonable antenna directivity. Reflection coefficients and radiation properties show that the proposed H-fractal antenna is a good candidate for a variety of antenna applications.

A dual-band printed dipole slot antenna for 2.4/5.2 GHz WLAN applications

A dual-band printed dipole slot antenna for wireless local area network operation has been designed. The proposed antenna is obtained by folded dual dipole slots operated at the half-wavelength mode. The antenna has a compact substrate size of 40 mm by 15 mm only. The antenna uses a T-shape microstrip fed line which can excite the dual slots to cover the operating bands 2.45 GHz (2.4 GHz – 2.484 GHz) and 5.25 GHz (5.15 – 5.35 GHz) WLAN band. The antenna has good radiation characteristics and good impedance bandwidth.

Optimization using Taguchi method for electromagnetic applications

This paper presents a novel electromagnetic optimization technique based on Taguchi method. Using the concept of the orthogonal array (OA), Taguchi method effectively reduces the number of tests required in an optimization process. Although this method has been successfully applied in many fields such as chemical engineering, mechanical engineering, IC manufacture, power electronics etc., it is not well known to the electromagnetics community, and only limited applications are available. The goal of this study is to introduce Taguchi method to the electromagnetics community and demonstrate its great potential in electromagnetic optimizations. The implementation procedure of the Taguchi method is presented in Fig. 1. The proposed optimization procedure has been applied in designing a linear antenna array with a sector beam pattern and a microstrip band stop filter (BSF). The desired antenna pattern and frequency response of BSF are successfully achieved. Compared to other optimization techniques, such as the genetic algorithm (GA) and particle swarm optimization (PSO), Taguchi method is easy to implement, and can quickly converge to the optimum solution.

Electromagnetic optimization using Taguchi method: a case study of linear antenna array design

This paper introduces a novel electromagnetic optimization technique using Taguchi method. To illustrate this technique, a linear antenna array is optimized to realize a null control pattern and a sector beam pattern. It is found that Taguchi method is easy to implement and it converges to the desired patterns quickly. This method is a good candidate for optimizing EM applications

An NCNU-shape planar antenna for multiband applications

NCNU is the abbreviation of our university, National Chi Nan University. This paper proposes a planar antenna with an NCNU shape. The proposed antenna is fed by a 50 ohms microstrip with width 3 mm, a unique and meaningful shape patch, and an asymmetrical ground plane. The antenna is investigated by both simulation and measurement. The bandwidth and resonant frequency of the proposed antenna are mainly affected by an NCNU-shaped radiating patch and a rectangular ground plane. Simulation results show that the antenna exhibits three main resonances around 2.45 GHz, 3.5 GHz, and 5.6 GHz covering several present wireless communication systems, i. e. 3.55 GHz (3.3 GHz–3.7 GHz) of world interoperability for microwave access (WiMAX), and 2.45 GHz (2.4 GHz–2.484 GHz) and 5.2 GHz/5.8 GHz (5.185 GHz–5.35GHz/5.725 GHz–5.875 GHz) of wireless local area network (WLAN). Details of the antenna design are described, and results of some prototypes are presented and discussed.

Electromagnetic optimization using taguchi’s method: A case study of band pass filter design

This article presents a global electromagnetic optimization approach using Taguchis method is linked with the IE3D simulator to design a microstrip band pass filter (BPF). Obtained results show that the desired frequency responses of the microstrip filters are successfully achieved, which demonstrates the validity and efficiency of the presented technique.