scholarly journals Air and Metal Vias Combined Metamaterial-Based Lens for Radiation Performance Enhancement of Short-Pulse Tapered Slot Antenna

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2845
Author(s):  
Yifan Yin ◽  
Qiuyi Zhang ◽  
Shunli Li
Keyword(s):  
Performance Enhancement ◽  
Short Pulse ◽  
Slot Antenna ◽  
Main Lobe ◽  
Wall Structure ◽  
High Fidelity ◽  
Cross Polarization ◽  
Frequency Range ◽  
Slot Antennas ◽  
Gain Enhancement

A post-wall-structured tapered slot antenna (PWTSA) loaded with an embedded metamaterial-based lens (metalens) is proposed and investigated for short-pulse applications. The proposed embedded metalens consists of not only a metallic delay lens, but also an airy acceleration region surrounding the lens, which is different from the conventional metalenses used in various tapered slot antennas and can exhibit a small equivalent permittivity. Therefore, the embedded metalens has a large usable range of permittivity and does not increase the size of the original prototype PWTSA. The post-wall structure and metalens of the proposed antenna can help it achieve a comprehensive and balanced performance, including a high fidelity, low cross-polarization, stable main-lobe direction and gain enhancement. The simulated and measured results show that without any increase in antenna size, the proposed antenna enhances the realized gain by 6.4 dB over the frequency range from 9 to 26 GHz and achieves a stable radiation with the offset of the main-lobe direction being confined to 2° up to 24.9 GHz. Furthermore, the cross-polarization levels are less than −20 dB and the fidelity is kept high for the short-pulse radiation with the frequency spectrum up to 30 GHz.

scholarly journals Low Cross-Polarization Gaussian Tapered Post-Wall Slotline Antenna for Short Pulse Applications

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Hongxin Zhao ◽  
Yufu Li ◽  
Xiaoxing Yin
Keyword(s):  
Frequency Band ◽  
Short Pulse ◽  
Characteristic Impedance ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Wall Structure ◽  
Impedance Bandwidth ◽  
Cross Polarization ◽  
Lower Frequency Band ◽  
Polarization Level

A Gaussian tapered slot antenna based on post-wall structured slotline for improvement of cross-polarization for ultra-wideband applications is proposed and experimentally demonstrated. The antenna is composed of two pairs of Gaussian tapered slotline which have the same structure printed on both sides of the PCB, two metallic via arrays positioned along the slot edges, and two terminal resistors. The metallic via arrays are used to reduce the characteristic impedance of the conventional slotline which form a post-wall slotline and thus can be fed by a coaxial connector directly. More importantly, the balanced symmetrical post-wall structure ensures low cross-polarization levels of the antenna. The Gaussian tapered edges and the terminal resistors diminish reflected signal and thus can enlarge the bandwidth significantly. Good agreements between the simulated and the measured results have been observed. Results show that the proposed antenna exhibits a −10 dB impedance bandwidth from 1.5 GHz to 20 GHz, a maximum realized gain of 12 dBi, and the broadside cross-polarization level is averaged about −32 dB in the lower frequency band and −25 dB in the higher frequency band with a maximum value of −22 dB in the whole working frequency band.

scholarly journals Wideband Printed Wide-Slot Antenna with Fork-Shaped Stub

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 347 ◽  
Author(s):  
Ke Li ◽  
Tao Dong ◽  
Zhenghuan Xia
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Slot Antenna ◽  
Wireless Communication Systems ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Slot Antennas ◽  
Resonance Technique ◽  
Operating Frequency Range ◽  
Measured Impedance

This paper presents a multiple-resonance technique that sought to achieve a wide bandwidth for printed wide-slot antennas with fork-shaped stubs. By properly appending an extra fork-shaped stub onto the main fork-shaped stub, the impedance bandwidth was able to be clearly broadened. To validate this technique, two designs where the extra stubs were added at different positions of the main stub were constructed. The measured impedance bandwidths of the proposed antennas reached 148.6% (0.9–6.1 GHz) for S11 < −10 dB, indicating a 17.9% wider bandwidth than that of the normal antenna (0.9–4.3 GHz). Moreover, a stable radiation pattern was observed within the operating frequency range. The proposed antennas were confirmed to be much-improved candidates for applications in various wireless communication systems.

Modelling and optimization of the linear tapered slot antenna

2021 ◽  
Author(s):  
Yu.S. Blinova ◽  
V.E. Drach ◽  
A.A. Litvinenko ◽  
A.V. Rodionov
Keyword(s):  
Microstrip Antenna ◽  
Wide Band ◽  
Antenna Design ◽  
Slot Antenna ◽  
Main Lobe ◽  
Frequency Range ◽  
Radar Sensor ◽  
Multiple Parameters ◽  
Ground Plate ◽  
Modelling And Optimization

A key component of any phased array or radar sensor is its antenna. For ultra wide band systems usually four types of antenna are being used: microstrip, tapered slot, sinuous and Yagi-Uda. The microstrip antenna generates two main lobes, which makes it a bidirectional antenna, like the tapered slot, sinuous, or Yagi-Uda antennae. Several efforts had been made to shift the bidirectional character of the microstrip antenna into unidirectional by placing a ground plate to absorb the undesirable main lobe. These efforts successfully eliminated the undesirable main lobe; however, side effects were introduced along the way, such as the remaining main lobe’s direction became frequency dependent. On the other hand, the sinuous antenna design is very complex when compared with the tapered slot antenna, involving multiple curvatures and angles. The Yagi–Uda antenna design, although less complex than the sinuous, still requires multiple segments and is more complicated than the tapered slot antenna. This study examined and analyzed primary parameters regarding their individual impact on linear tapered slot antenna design. The result is a set of recommendations for linear tapered slot antenna design to operate within the UWB frequency range. Unlike previous studies, which only focused on a certain set of these parameters, this paper provides a comprehensive recommendation for the parameters, which should result in a functional tapered slot antenna design. This set of recommendation can also serve as a base for further optimization, if desired. When used for optimization, the results from this study can guide the direction of changes when multiple parameters need to be adjusted simultaneously. Furthermore, this set of recommendations can be applied to other tapered slot antenna designs, as they all share, although are not defined completely, by these investigated parameters.

Wideband gain enhancement of slot antenna using superstructure with optimised axial permittivity variation

2016 ◽  
Vol 52 (4) ◽  
pp. 266-268 ◽  
Author(s):  
A.A. Baba ◽  
R.M. Hashmi ◽  
K.P. Esselle
Keyword(s):  
Slot Antenna ◽  
Gain Enhancement

Analytical and Calibration Models for Slot Antennas

2019 ◽  
pp. 57-100
Author(s):  
Kok Yeow You
Keyword(s):  
Numerical Simulation ◽  
Analytical Calculation ◽  
Computation Time ◽  
Systematic Errors ◽  
Simulation Software ◽  
Slot Antenna ◽  
Slot Antennas ◽  
Long Period ◽  
Calibration Models ◽  
Calibration Methods

In this chapter, the background, analytical formulations, and calibration routines for slot antennas are briefly reviewed. Performance and operating frequency of the slot antenna are strongly dependent on the dimension and shape of the slot or slotted array on the antenna. Nowadays, most antennas are designed using numerical simulation software for accuracy in analysis. However, analytical formulations still play an important role in the pre-design of the antenna due to the numerical simulation which still requires relatively long period of computation time compared to the analytical calculation. The predicted dimension of the antenna from analytical calculations will only require minor adjustment to optimize its performance in numerical simulation. Hence, the time spent for the antenna design can be shortened. Besides the performance of antenna, the antenna calibration process is crucial as well for releasing systematic errors in the antenna measurements. Some one-port calibration methods are described in detail.

scholarly journals Low Cross-Polarization Improved-Gain Rectangular Patch Antenna

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1189 ◽  
Author(s):  
Anurag Singh ◽  
Sandip Vijay ◽  
Rudra Narayan Baral
Keyword(s):  
Patch Antenna ◽  
Frequency Selective Surface ◽  
Cross Polarization ◽  
Gain Enhancement ◽  
Rectangular Patch ◽  
Shorting Pin ◽  
Half Power ◽  
Broadside Radiation ◽  
Polarization Level ◽  
Good Agreement

In this paper, a low cross-polarization improved-gain rectangular patch antenna is presented. A patch-ground shorting pin with defected patch structure (DPS) is introduced to suppress the cross-polarization level. A High Reflective Frequency Selective Surface (HRFSS) superstrate is designed and placed over the proposed antenna at an optimized position to intensify the gain. To characterize the unit-cell of the superstrate, its transmission characteristics are extracted and discussed. Integration of the superstrate achieves a beam contraction resulting in a gain enhancement to 10.65 dBi. The proposed antenna has perfect broadside radiation with a cross-polarization level of below −30 dB in the entire half power beamwidth. The prototype of the antenna exhibits good agreement between experimental and simulated results.

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