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This paper presents performance enhancement of a conventional circularly-polarized (CP) microstrip patch array using anisotropic metasurfaces. In addition to boresight gain, axial-ratio and impedance bandwidth amplifications, sidelobe levels suppression were also focused.
X-band folded reflectarray (FRA) antenna is designed and implemented. The proposed FRA provides compactness, reliability, broadband with high efficiency. The reflectarray utilizes multilayer patch cells that receive the waves and twist them from vertical to horizontal polarization with the proper phase. Variable microstrip line lengths control the phases of scattering parameters. The FRA is designed...
A 60 GHz 2×2 planar microstrip antenna array is proposed. An aperture-coupled feeding technique with inclined rectangular slots has been used to ensure equal coupling to each radiating patch. After optimization by a CST MWS simulation tool, a prototype antenna is fabricated and measured. The results show good agreement between simulations and measurements. The proposed antenna exhibits a maximum realized...
A novel hybrid-fed dual-polarized 1×4 patch array microstrip stacked antenna is proposed for Ku-band radar systems which require low cross-polarization and compact size. The antenna is fed by cable probe and microstrip transmission line. A conductor ground between two layer dielectric substrates is employed to shield the radiation microstrip patch array and the feed networks in order to discriminate...
A circularly polarized microstrip reflectarray antenna with a microstrip antenna feed and patches having variable rotation angles is proposed. A parametric study for three different configurations, namely a single patch, 1 × 3 and 3 × 1 array is presented. The plus-shaped and 3 × 3 array configurations have also been studied. It is observed that an optimum axial ratio bandwidth of around 45 MHz is...
This paper presents 2×2 patch array antenna for 2.45 GHz industrial, scientific and medical (ISM) band application. In this design, four array radiating elements interconnected with a transmission line and excited by 50Ω subminiature (SMA). The proposed antenna structure is combined with a reflector in order to investigate the effect of air gap between radiating element and reflector in terms of reflection...
A single layer wideband SIW-fed differential patch array is proposed in this paper. A SIW-CPS-CMS (substrate integrated waveguide - coupled lines - coupled microstrip line) transition is designed and has a bandwidth of about 50%, covering the E-band and W-band. The differential phase deviation between the coupled microstrip lines is less than 7.5° within the operation band. A 1×4 array and a 4×4 array...
It has been discovered that the asymmetrical elements' length of upper and below truncated edges are the new parameter to fulfill the requirement of circular polarization (CP). The proposed antenna has a simple structure, consists of 2 × 2 patch antenna as its radiating elements and a single coaxial connector at the ground layer is used as a feed. The dimension of each patch antenna is 25.65 mm ×...
In this paper, a four element coplanar waveguide fed monopole antenna which is arrayed as volume array antenna to obtain omnidirectional pattern is presented. This femtocell antenna is designed to work at frequency 2.3-2.5 GHz for VSWR <2 and have at least 100 MHz impedance bandwidth. This array antenna has low mutual coupling, 460 MHz bandwidth at frequency 2.05-2.51 GHz and gain 6.3 dBi.
Four-element microstrip patch antenna array is proposed at millimeter wave frequency. The proposed antenna achieves the impedance bandwidth of 4.6% at 28 GHz as well as a flat gain of 13.5 dB over an operating frequency band. It uses the aperture coupling along with air cavities to feed the patch elements. It achieves the side lobe level of -23 dB in the H Plane and -14.5 dB in the E plane. In addition,...
A high gain and wide band stacked antenna array, having a microstrip aperture coupled feeding technique with a mounted Horn integrated on it, is presented. With optimized parameters, the 2×2 antenna array at a center frequency of 60 GHz, exhibits an impedance bandwidth of about 10.58 % (58.9 – 65.25 GHz). With a corporate feed network, the 2×2 array structure resulted a gain of 15.3 dB with an efficiency...
To meet the high gain requirement, a 2×2 a microstrip patch antenna array is designed and used as a feed source to illuminate a symmetric parabolic reflector antenna at 300 GHz. The effect of the substrate and conductor material properties on the performance of the microstrip array antenna is discussed. Resulting reflector antenna performance is discussed using this feed. Another application of this...
This paper presents the study of new technique for exciting the 4×4 rectangular microstrip patches antenna (MSA) array by using a single patch, which is surrounded with metallic plate. The objective of this research is to explore the new technique for exciting any microstrip array instead of the conventional phasing line that have energy loss and narrow bandwidth occurred inside it. From many literatures,...
A microstrip grid array antenna is designed at 24 GHz on a single-layer RT/duriod 5880 substrate with a thickness of 0.31 mm. Simulated results show that the microstrip grid array antenna achieved a 10-dB impedance bandwidth of 210MHz, a 3-dB gain bandwidth of 500-MHz, and the maximum gain of 30.1 dBi at 24.15 GHz.
A new kind of Yagi array of microstrip quarter-wave patch antennas is presented. The antenna array has a low profile and provides a high gain and a vertical polarization at endfire. Compared with previous Yagi array of microstrip half-wave patch antennas, the Yagi array of quarter-wave patch antennas has a smaller size and does not suffer the constraint in dielectric constant in the substrate. Besides,...
In this paper the design of a high directivity antenna at terahertz regime for using in imaging applications and a chiral metamaterial cover, which enhances the radiation pattern of the antenna, are presented. The structure of the antenna is based on a linear array of planar patches fed by a distribution of slots working in W -band and it presents low cost and easy manufacture. On the other hand,...
This paper presents the design of a multilayer parasitic microstrip antenna array concerned on enhancement of gain at 5.8 GHz for WiMAX application. The proposed structure of this project is microstrip patch antenna array which is composes of three layers using different material substrate. The substrate for the first layer consists of Flame Retardant 4 (FR-4) that has thickness 1.6mm while the second...
This paper presents the design and analysis of the microstrip Yagi antenna appropriate for wireless fidelity (Wi-Fi) application. The antenna comprises of two elements which are driven and parasitic that consists of reflector and directors. The analysis has been carried out to identify the effects of each element to the performance of antenna that will achieve a high gain. A gain enhancement method...
The popularity of microstrip antennas is increasing day by day because of ease of analysis and fabrication. This paper concerned on enhancement of gain for microstrip patch planar array antenna by using air substrate. The structure in this project is 2 by 2 microstrip patch planar array antenna with substrate εr= 1at frequency 5.8 GHz. Frequency for 5.8GHz can be applied to unlicensed WiMAX. In this...
This article highlights the effect of superstrate height on gain of MSA fed Fabry Perot Cavity (FPC) antenna. The FPC antenna structure consists of a microstrip antenna, which feeds an array of square parasitic metal patches fabricated on a FR4 superstrate. These patches are good reflector of microwave frequency and therefore are used to enhance the reflection coefficient and the gain. Field amplitude...
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