Wideband asymmetric coplanar waveguide antenna using composite right/left‐handed transmission line

Abstract

A broadband asymmetric coplanar waveguide antenna is designed. In this design, two periodical composite right/left‐handed transmission line (CRLH‐TL) unit cells were chosen to generate three resonating modes. The broadband characteristic of this antenna can be achieved by combining the first‐negative‐order resonance, zeroth‐order resonance, and first‐positive‐order resonance of CRLH‐TL. A prototype structure of our proposed antenna has been fabricated and tested. The dimensions of the antenna are 30.0 × 40.0 × 1.6 mm3, which corresponds to 0.19 λ 0 ${\lambda }_{0}$ × 0.25 λ 0 ${\lambda }_{0}$ × 0.01 λ 0 ${\lambda }_{0}$, where λ 0 ${\lambda }_{0}$ is the free‐space wavelength at 1.88 GHz. The measured band in which S11 is below −10 dB ranges from 1.80 to 3.75 GHz with the fractional bandwidth of 70.27%. The radiation patterns of the proposed antenna are highly consistent throughout the operating band, which covers the band of WiMAX, with the measured average peak gain of 2.77 dBi and radiation efficiency of 86.63%.

The Method of High Precision Self localization of Transmission Line Bolts by Lightweight Maintenance Robot

“…The transmission range of the transmission line is wide, and there are many transmission nodes. Affected by the natural environment around the line, bolt corrosion, falling off and other problems often occur, affecting the normal transmission of the line [1][2][3]. As a fixed part of transmission lines, bolts are commonly found in transmission towers, which are fixed by bolts with pins to ensure the overall stability of transmission lines.…”

A Tri-mode Hybrid Antenna for Quad-band Applications

“…Narrow bandwidth restricts the ability of ZOR antennas to satisfy the communication needs of modern multifunctional smart devices. To achieve a wider bandwidth, two methods have been adopted in recent literature [10][11][12][13][14][15][16][17][18][19]. The first method is to lower the Q-factor of the ZOR by changing the distributed element values [10][11][12][13][14][15].…”

“…The first method is to lower the Q-factor of the ZOR by changing the distributed element values [10][11][12][13][14][15]. The second method is to excite another working mode of the ZOR antenna, such as the first negative order resonance (FNOR) mode, the first positive order resonance (FPOR) mode, and then combine them to yield a wider bandwidth [16][17][18][19]. Although these methods have widened the bandwidth of ZOR antenna to some degree, the improvement is relatively limited.…”

Miniaturized tri‐wideband antenna loaded with metamaterial meander lines

“…4 Highly size compactness in printed multiband antennas can be accomplished with the concept of metamaterial-based transmission-lines, which in comparison with traditional structures, the resonance conditions are independent of the physical dimensions of the resonator. [5][6][7][8] Even though, most compact metamaterial multiband antennas reported are narrow-band or dual-band. 9,10 On the contrary, based on the literature, sparse efforts have been made on miniaturized metamaterial-based triwideband antennas.…”

“…Miniaturized multiband printed antennas with minimized dimensions are more suitable for integration in modern applications with limited space as well as in diversity and MIMO structures that use several single antenna elements to enhance the performance 4 . Highly size compactness in printed multiband antennas can be accomplished with the concept of metamaterial‐based transmission‐lines, which in comparison with traditional structures, the resonance conditions are independent of the physical dimensions of the resonator 5–8 . Even though, most compact metamaterial multiband antennas reported are narrow‐band or dual‐band 9,10 .…”