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دسترسی آزاد مقاله
1 - UWB Beveled Edge Rounded Bowtie Antenna
Duygu Nazan Gençoğlan Şule ÇolakBeveled edge rounded bowtie antenna is proposed for UWB applications in this paper. Beveling technique is employed to increase the bandwidth of classical bowtie antenna. The simulated bandwidth is from 3 GHz to 11 GHz in order to observe the bandwidth enhancement in the چکیده کاملBeveled edge rounded bowtie antenna is proposed for UWB applications in this paper. Beveling technique is employed to increase the bandwidth of classical bowtie antenna. The simulated bandwidth is from 3 GHz to 11 GHz in order to observe the bandwidth enhancement in the frequency range of interest for UWB applications. Effective parameters of the antenna, including Return Loss (S11), Voltage Standing Wave Ratio (VSWR) and radiation pattern are examined for the proposed structure. Then behavior of the designed antenna is compared with the classical bowtie antenna and rounded bowtie antenna characteristics to verify the enhancement due to the beveled edge structure. Besides, it is demonstrated that the proposed antenna satisfies UWB requirements by providing return loss less than -10 dB and VSWR less than 2, respectively during the enhancement process. Beveled edge rounded bowtie antenna model is designed by using CST Microwave Studio Program which is an electromagnetic simulation auxiliary tool. پرونده مقاله -
دسترسی آزاد مقاله
2 - A Thorough Analysis of Wire Bow-Tie Antenna
Parisa Fallah Bijan Zakeri Amirashkan DarvishGround penetrating radar (GPR) is one of the most important instruments in some cases such as remote sensing, non-destructive evaluation and microwave imaging. The radiation component (antenna) in these radars is very important. Features and constraints such as high imp چکیده کاملGround penetrating radar (GPR) is one of the most important instruments in some cases such as remote sensing, non-destructive evaluation and microwave imaging. The radiation component (antenna) in these radars is very important. Features and constraints such as high impedance bandwidth, stable radiation patterns, minimum distortion of the antenna end reflections and consequently sending high-precision pulses makes many challenges in construction and design of the antenna. In addition, the antenna size, which is expected to cover both low frequencies and portability, adds to the difficulty of designing this antenna. In this paper, four possible modes of wire bowtie antenna, which is known as one of the most common antenna in impulse GPR applications are introduced and investigated. To this regard, late-time-ringing effect of the transmitted UWB waveform, pattern characteristics and impedance bandwidth of the proposed structures have been analyzed and compared. The results show that the other modes can be replaced to the original one in most cases. پرونده مقاله