scholarly journals A Dual-Polarized Printed Antenna Based on a Tapered Slot SICL Balun for Airborne Radar Application

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Xiaochun Liu ◽  
Li Wang ◽  
Mingxi Zhang ◽  
Shaobin Liu ◽  
Guiqiang Du
Keyword(s):  
Microstrip Line ◽  
High Efficiency ◽  
Airborne Radar ◽  
Strip Line ◽  
Cross Polarization ◽  
Tem Mode ◽  
The Cross ◽  
Dual Polarized ◽  
Polarization Level ◽  
Dual Polarized Antenna

The substrate-integrated coaxial line (SICL) is a potential transmission line due to its good characteristics of high efficiency, nondispersive, and single operational mode. A tapered slot SICL balun is proposed, which can realize the impedance transformation from the microstrip line to the coplanar strip line (CPS). At the same time, the proposed balun can transform the quasi-TEM mode of the microstrip line to the TEM mode of CPS. A printed dipole radiator is designed and is fed by the proposed SICL balun to achieve the impedance matching. The dual-polarized radiation mode is realized by employing two orthogonal printed dipoles. For each polarization radiator, the CPS is bended to avoided the occlusion of two polarization ports and realize the direct assembling of two orthogonal printed circuits. What is more, the assembling method is advantageous to improve the port isolation degree and decrease the cross polarization level. To improve the ratio of front to back (F/B) of the radiation pattern, a cylindrical metal cavity is adopted. According to the results of simulation and experiments, the VSWR of each port is lower than 2, the isolation degree between two polarization ports is higher than 20 dB, and the cross polarization level at the boresight is lower than −20 dB at the operational frequency. The patterns of two ports are almost symmetric, and high radiation efficiency is obtained. The experimental results of the principle prototype verify the design schemes of the balun and the dual-polarized antenna. The proposed dual-polarized antenna fed by the tapered slot SICL balun is suitable for the airborne radar application.

scholarly journals Suppression of Cross-Polarization of the Microstrip Integrated Balun-Fed Printed Dipole Antenna

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Huang Jingjian ◽  
Zhang Xiaofa ◽  
Xie Shaoyi ◽  
Wu Weiwei ◽  
Yuan Naichang
Keyword(s):  
Frequency Band ◽  
Dipole Antenna ◽  
Equivalent Model ◽  
Substrate Thickness ◽  
Cross Polarization ◽  
Engineering Applications ◽  
Novel Structure ◽  
The Cross ◽  
Polarization Level

The high cross-polarization of the microstrip integrated balun-fed printed dipole antenna cannot meet the demands of many engineering applications. This kind of antennas has high cross-polarization levels (about −20 dB). And we find that the high cross-polarization radiation is mainly produced by the microstrip integrated balun rather than the dipole itself. The very limited method to lower the cross-polarization level of this kind of antennas is to reduce the substrate thickness. In this paper, to improve the low cross-polarized performance, firstly, an equivalent model is presented to analyze the cross-polarization radiation. Secondly, a novel structure with low cross-polarization is proposed. The microstrip integrated balun is enclosed by a center slotted cavity. The E-field of the microstrip integrated balun is transformed parallel to the dipole arms by the slot, so the radiation of the cross-polarized component is suppressed. Measured results show that this structure can achieve a bandwidth wider than 40% while reducing the cross-polarization level to less than −35 dB within the frequency band.

scholarly journals Dual-Band Patch Antenna Fed by Meandering Probe for Low Cross-Polarization

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Xiao-Lan Zhao ◽  
Quan Wei Lin
Keyword(s):  
Reflection Coefficient ◽  
Patch Antenna ◽  
Dual Band ◽  
Cross Polarization ◽  
Frequency Range ◽  
Face To Face ◽  
Resonance Modes ◽  
The Cross ◽  
Polarization Level

This paper presents a dual-band patch antenna loaded with face-to-face U-shaped slots fed by a substrate-integrated meandering probe (SIM-probe). With the presence of U-shaped slots, two current paths are formed, which leads to the resonance modes at 2.4 and 3.65 GHz on the patch. The SIM-probe suppresses the unwanted cross-polarization radiations by providing out-of-phase vertical currents from vertical metallic vias. To verify our work, a prototype was fabricated and tested. The proposed antenna achieves the impedance bandwidths of 9.4% and 9% from the frequency range of 2.34–2.57 GHz and 3.5–3.83 GHz (for the reflection coefficient ≤ −10 dB) and obtains average gains of 5.8 dBi and 6.8 dBi at both bands. The cross-polarization level is below −20 dB. Measured results agree well with the simulation.

scholarly journals A Low Cross-Polarization Configuration Method for Phased Array Radar Antenna

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 396 ◽  
Author(s):  
Yongzhen Li ◽  
Zhanling Wang ◽  
Chen Pang ◽  
Xuesong Wang
Keyword(s):  
Phased Array ◽  
Polarization State ◽  
Cross Polarization ◽  
Dual Polarization ◽  
Phased Array Radar ◽  
The Cross ◽  
Radar Antenna ◽  
Polarization Level ◽  
State Configuration ◽  
Key Parameter

The cross-polarization isolation (CPI) is a key parameter to assess the dual-polarization antenna because the cross-polarization closely affects the antenna application. A polarization state configuration (PSC) approach is proposed to configure the polarization state of the polarimetric phased array radar antenna. Unlike the traditional fixed polarization states such as the linear polarization (LP) and the circular polarization (CP), the PSC method modulates the polarization state of the radiated wave continuously. In addition, the optimal excitation magnitude and phase of the dual-polarization element is calculated, thereby maximizing the CPI. Most of the configured polarization state is the elliptical polarization (EP), and a lower cross-polarization level and higher CPI could be obtained. This method could expand the acceptable angle range when compared with the LP and CP waves. Numerical simulations and comparisons are conducted to manifest the validity of the proposed method.

scholarly journals A Wideband Dual-Polarized Antenna Using Planar Quasi-Open-Sleeve Dipoles for Base Station Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Guan-xi Zhang ◽  
Li Sun ◽  
Bao-hua Sun
Keyword(s):  
Return Loss ◽  
Ground Plane ◽  
Base Station ◽  
Cross Polarization ◽  
High Frequencies ◽  
Feeding Structure ◽  
Polarization Characteristics ◽  
Dual Polarized ◽  
Dual Polarized Antenna ◽  
Better Than

A wideband dual-polarized antenna for WLAN, WiMAX, and LTE base station applications is presented in this paper. The proposed antenna consists of two pairs of orthogonal planar quasi-open-sleeve dipoles along the centerlines, a balanced feeding structure and a square ground plane. The planar quasi-open-sleeve dipole comprises a pair of bowtie-shaped planar dipoles with two parallel curve parasitic elements. The introduced parallel curve parasitic elements change the path of the current of the original bowtie-shaped planar dipoles at high frequencies and hence wideband characteristic is achieved. Two pairs of the planar quasi-open-sleeve dipoles placed orthogonally further broaden the bandwidth of the antenna with dual-polarization characteristics. The proposed antenna achieves a 10-dB return loss bandwidth from 2.32 to 4.03 GHz (53.9% bandwidth) using the planar quasi-open-sleeve dipole structures. The isolation between the two ports remains more than 32 dB in the whole bandwidth. Measured results show that the proposed antenna keeps the cross-polarization under −33 dB and the front-to-back ratio better than 15 dB in the operating band. The antenna has an area of 0.3λ  × 0.3λat 2.32 GHz making it easy to be extended to an array element.

Cross-Polarization Discrimination and Port-to-Port Isolation Enhancement of Dual-Polarized Antenna Structures Enabling Polarization MIMO

2019 ◽  
Vol 18 (11) ◽  
pp. 2409-2413 ◽  
Author(s):  
Shuhei Yamada ◽  
Debabani Choudhury ◽  
Chintan Thakkar ◽  
Anandaroop Chakrabarti ◽  
Kaushik Dasgupta ◽  
...  
Keyword(s):  
Cross Polarization ◽  
Dual Polarized ◽  
Dual Polarized Antenna
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