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

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.

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Cross-polarization level in radiation from a microstrip dipole antenna

IEEE Transactions on Antennas and Propagation ◽

10.1109/8.8595 ◽

1988 ◽

Vol 36 (9) ◽

pp. 1197-1203 ◽

Cited By ~ 4

Author(s):

A. Hoorfar ◽

K.C. Gupta ◽

D.C. Chang

Keyword(s):

Dipole Antenna ◽

Cross Polarization ◽

Polarization Level

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

International Journal of Antennas and Propagation ◽

10.1155/2016/5196350 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 1

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.

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

Electronics ◽

10.3390/electronics9030396 ◽

2020 ◽

Vol 9 (3) ◽

pp. 396 ◽

Cited By ~ 1

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.

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Cross-polarization suppression in C-shaped microstrip patch antenna employing anisotropic dielectrics

Journal of Advanced Dielectrics ◽

10.1142/s2010135x17500266 ◽

2017 ◽

Vol 07 (04) ◽

pp. 1750026 ◽

Cited By ~ 1

Author(s):

Hongyu Shi ◽

Shitao Zhu ◽

Jianxing Li ◽

Anxue Zhang ◽

Zhuo Xu

Keyword(s):

Patch Antenna ◽

Microstrip Patch Antenna ◽

Cross Polarization ◽

Anisotropic Dielectric ◽

Gain Enhancement ◽

Microstrip Patch ◽

Anisotropic Dielectrics ◽

The Cross ◽

Polarization Level ◽

Layered Ceramic

An anisotropic dielectric realized by layered ceramic structures was adopted to design a low cross-polarization C-shaped patch antenna. The anisotropic dielectric performs as a substrate and can cause additional cross-polarized fields which are able to cancel the cross-polarized fields generated by the C-shaped patch itself, and then reduce the cross-polarization level. Compared to the C-shaped patch antenna with an isotropic substrate, the cross-polarization of the proposed antenna is suppressed by more than 15[Formula: see text]dB with a little gain enhancement at 2.4[Formula: see text]GHz. The anisotropic dielectric has a little impact on the direction of the C-shaped patch antenna. The gain of the proposed C-shaped patch antenna is 6.8[Formula: see text]dB with a cross-polarization of [Formula: see text]28[Formula: see text]dB.

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Half mode substrate integrated waveguide based leaky wave antenna with low cross polarisation

Frequenz ◽

10.1515/freq-2019-0161 ◽

2020 ◽

Vol 74 (7-8) ◽

pp. 239-245

Author(s):

Pravesh Belwal ◽

Rahul Agrawal ◽

Suresh Chandra Gupta

Keyword(s):

Longitudinal Axis ◽

Forward Direction ◽

Main Beam ◽

Substrate Integrated Waveguide ◽

Cross Polarization ◽

Leaky Wave ◽

Leaky Wave Antenna ◽

Wave Antenna ◽

The Cross ◽

Polarization Level

AbstractA half mode substrate integrated waveguide (HMSIW) based leaky wave antenna (LWA) featuring low cross-polarization is proposed in this paper. The umbrella-shaped slot (the combination of longitudinal and transverse slots) is etched on the top layer of HMSIW LWA to get the efficient broadside radiation. The scanning range is obtained from −47° to +30° in a frequency range of 8.3 to 15.1 GHz. The cross-polarization level for the LWA is around −10 dB at broadside. In order to improve the cross-polarization levels in HMSIW LWA, two antennas are placed face to face obtaining the balanced symmetry across the longitudinal axis. Both the simulated and measured results show that the antenna is able to scan continuously from backward to forward direction with a very good low cross-polarization level. The developed prototype is capable of continuous beam scan from −29° to +32° in an operating frequency band of 9.2 to 15 GHz with a maximum gain of 13.5 dBi. The measured cross-polarization level is −30 dB which is quite low for the main beam at the broadside direction.

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

International Journal of Antennas and Propagation ◽

10.1155/2017/4852709 ◽

2017 ◽

Vol 2017 ◽

pp. 1-7 ◽

Cited By ~ 1

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.

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

International Journal of Antennas and Propagation ◽

10.1155/2020/7148969 ◽

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.

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Enhanced cross-polarization isolation of loop-dipole antenna array backed by dielectric cavities for 5G base stations

Journal of Electromagnetic Waves and Applications ◽

10.1080/09205071.2021.1929507 ◽

2021 ◽

pp. 1-17

Author(s):

Yiran Da ◽

Xiaoming Chen ◽

Mengting Li ◽

Zhenyuan Zhang ◽

Azremi Abdullah Al-Hadi ◽

...

Keyword(s):

Antenna Array ◽

Dipole Antenna ◽

Base Stations ◽

Cross Polarization

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Investigation of e-textile dipole antenna performance based on embroidery parameters

Textile Research Journal ◽

10.1177/00405175211013421 ◽

2021 ◽

pp. 004051752110134

Author(s):

Daniel Agu ◽

Rachel J Eike ◽

Allyson Cliett ◽

Dawn Michaelson ◽

Rinn Cloud ◽

...

Keyword(s):

Frequency Band ◽

Impedance Matching ◽

Dipole Antenna ◽

Water Soluble ◽

Wearable Sensor ◽

Dipole Antennas ◽

Antenna Performance ◽

Large Production ◽

Lower Transmission ◽

The Ideal

E-textile antennas have the potential to be the premier on-body wearable sensor. Embroidery techniques, which can be applied to produce e-textile antennas, assist in large production volumes and fast production speeds. This paper focuses on the effects of three commonly used embroidery parameters, namely stitch type, conductive thread location, and stabilizer, on the performance of embroidered dipole antennas in order to determine the ideal embroidery combination for optimal antenna performance. Fifty-four dipole antenna samples were fabricated and measured at the industrial, scientific, and medical (ISM) frequency band of 2.45 GHz. The results of this study show that machine-embroidered antenna designs with satin stitches resonate at a lower frequency and exhibit a lower transmission gain compared with those made with contour stiches, and the conductive thread location in the bobbin location plus the use of a water-soluble stabilizer can help improve impedance matching.

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