scholarly journals High Gain and High Directive of Antenna Arrays Utilizing Dielectric Layer on Bismuth Titanate Ceramics

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
F. H. Wee ◽  
F. Malek ◽  
Farid Ghani ◽  
S. Sreekantan ◽  
A. U. Al-Amani
Keyword(s):  
Antenna Arrays ◽  
Dielectric Layer ◽  
Bismuth Titanate ◽  
High Gain ◽  
Array Antenna ◽  
Impedance Bandwidth ◽  
High Radiation ◽  
The One ◽  
Titanate Ceramics ◽  
Microwave Substrate

A high gain and high directive microstrip patch array antenna formed from dielectric layer stacked on bismuth titanate (BiT) ceramics have been investigated, fabricated, and measured. The antennas are designed and constructed with a combination of two-, four-, and six-BiT elements in an array form application on microwave substrate. For gain and directivity enhancement, a layer of dielectric was stacked on the BiT antenna array. We measured the gain and directivity of BiT array antennas with and without the dielectric layer and found that the gain of BiT array antenna with the dielectric layer was enhanced by about 1.4 dBi of directivity and 1.3 dB of gain over the one without the dielectric layer at 2.3 GHz. The impedance bandwidth of the BiT array antenna both with and without the dielectric layer is about 500 MHz and 350 MHz, respectively, which is suitable for the application of the WiMAX 2.3 GHz system. The utilization of BiT ceramics that covers about 90% of antenna led to high radiation efficiency, and small-size antennas were produced. In order to validate the proposed design, theoretical and measured results are provided and discussed.

scholarly journals Wide Scan Angle Randomly Overlap Subarray Antenna for 5G in 28GHz

2021 ◽  
Author(s):  
Maryam Shadi ◽  
Zahra Atlasbaf
Keyword(s):  
Antenna Arrays ◽  
Weighting Function ◽  
Minimum Cost ◽  
High Gain ◽  
Base Station ◽  
Phase Shifters ◽  
Array Antenna ◽  
Optimum Number ◽  
Compact Size ◽  
Minimum Number

Abstract Synthesizing antenna arrays for fifth-generation communication technology is the most significant issue in the electromagnetic industry and academia. This paper focused on a comprehensive algorithm to design an antenna array used as a 5G base station antenna. The proposed algorithm's goal has an array antenna with high gain, continuous wide scan angle without grating lobe, compact size, minimum cost, and simplicity of construction, particularly in the array feeding network's system. For this purpose, several factors, such as subarray topology, complex weighting function, the minimum number of RF elements, and the optimum number of microstrip layers will be intended. The desired topology is specified with the grating lobe's minimum level by comparing the array factor of different subarray combinations. We consider some limitations in our algorithm that improve the specification than before research and reduce the runtime algorithm. Moreover, the number of phase shifters is decreased to more than 53%, substantially improved than previous works. The GAPSO technique is then used to determine the excitation coefficients' optimal value to control SLL and beam scanning. Amplitude accuracy and phase are considered 0.1 and 1 degree, respectively, to avoid tolerance construction. The proposed method is also applied to design a linear array antenna using a 5G base station antenna in 28 GH. This aperiodic linear array's electromagnetic parameter consists of HPBW of 2.8◦, a gain of 20 dB, scanning up to ±50◦ in one direction, and SLL is below -15 dB.

scholarly journals Design of Yagi Antenna with Slow-Wave Half-Mode SIW Feeding Technique for Ku Band Applications

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Bo Han ◽  
Shibing Wang ◽  
Jia Zhao ◽  
Xiaofeng Shi
Keyword(s):  
Slow Wave ◽  
Return Loss ◽  
High Gain ◽  
Impedance Bandwidth ◽  
Yagi Antenna ◽  
Feeding Technique ◽  
Low Insertion Loss ◽  
Microwave Substrate ◽  
Peak Gain ◽  
Ku Band

A novel planar Yagi antenna printed on a microwave substrate with dielectric constant of 3.55 for Ku band applications has been presented in this paper. The proposed antenna has been fed by the slow-wave half-mode substrate-integrated waveguide and has achieved good characteristics, such as reduced size, high gain, broadband, and low insertion loss. The proposed antenna has been fabricated by Rogers 4350 substrate with lengths of two arms for dipole 0.46 λ0. Measured results indicate that the impedance bandwidth (below −10 dB return loss) is from 15.4 GHz to 19.4 GHz with peak gain 7.49 dBi. Both simulations and experiments convince that the proposed antenna could have reliable applications for Ku band wireless communications.

scholarly journals Performance of a New Design Based on Substrate-Integrated Waveguide Slotted Antenna Arrays for Dual-Band Applications (Ku / K)

2020 ◽  
Vol 16 (2) ◽  
pp. 131-142
Author(s):  
Turkiya Abes ◽  
Keltouma Nouri ◽  
Boubaker Seddik Bouazza ◽  
Kada Becharef
Keyword(s):  
Antenna Arrays ◽  
Return Loss ◽  
High Gain ◽  
Array Antenna ◽  
Dual Band ◽  
Antenna Feed ◽  
Full Wave ◽  
Slotted Antenna ◽  
The Time Domain ◽  
Good Agreement

This paper introduces and discusses the study of a new concept for SIW array antenna development. This conducted development is based on three designs, two of them related to 1x2 arrays fed by SIW line, combined with SIW inset line, and the last designed for 2X2 array antenna feed by SIW inset line. All these structures are designed to give dual-band at (Ku - K) bands with enhanced gain and bandwidth. The new 2x2 array antenna has a high gain, and it consists of four SIW cavities staggered patches with a 90° phase shift, which are fed using microstrip line shielded by SIW vias. The designs were conducted using full-wave simulator ANSYS HFSS - the frequency domain solver. The 2x2 array antenna gives a return loss about (-20 dB), a high gain of 9.05 dB, and two bandwidth equals 210 MHz and 1310 MHz respectively at both of the operating bands. To validate the simulated results the simulation was conducted again using the time-domain solver of the CST Microwave Studio (MWS) full-wave simulator. Simulation results obtained from the two software having different solvers were in good agreement in the results.

scholarly journals Wideband Slot Array Antenna Fed by Gap Waveguide with Right-Handed Circular Polarization and High Gain

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Pejman Mahmoudi Kanesbi ◽  
Nasrin Amiri
Keyword(s):  
Circular Polarization ◽  
Millimeter Wave ◽  
Axial Ratio ◽  
High Gain ◽  
Array Antenna ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Circularly Polarized ◽  
Metal Layers ◽  
Final Array

A wideband and high-gain circularly polarized (CP) 16 × 16 array antenna based on gap waveguide technology is presented for millimeter-wave applications at 28 GHz frequency range. Four cavity-backed slots with linear polarized (LP) radiation are used as the subarray. CP is obtained by a 4 × 4 sequential feeding network which is also expanded to achieve high gain. The feeding network of the final array antenna consists of two layers based on the ridge gap waveguide (RGW), and it has four unconnected metal layers. It is shown by simulation that the proposed antenna has 20.5% impedance bandwidth over 25.8–31.7 GHz and 3 dB axial ratio bandwidth near 10% over 27.2–30 GHz. In addition, the maximum gain value for this antenna is 31.6 dBi at a frequency of 29 GHz, which shows good performance compared to other structures.

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