Broadband Partially Reflecting Superstrate-Based Antenna for 60 GHz Applications

Baba, Affan A.; Hashmi, Raheel M.; Marin, Julio Gonzalez; Hesselbarth, Jan

doi:10.1109/tap.2019.2916474

Cited by 32 publications

(7 citation statements)

References 19 publications

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“…To improve gain, a PRS was implemented, albeit at the cost of increased complexity. In [8] and [9], two mmWave antennas achieved high gains of 19.4 dBi and 16.4 dBi, respectively, utilizing PRS. However, balancing the performance of individual antenna elements in a MIMO configuration with PRS proves challenging.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

“…In a prior study [7], a mmWave broadside antenna integrated with a phone screen exhibited a radiation efficiency of only 24.15% To improve gain, a PRS was implemented, albeit at the cost of increased complexity. In [8] and [9], two mmWave antennas achieved high gains of 19.4 dBi and 16.4 dBi, respectively, utilizing PRS. However, balancing the performance of individual antenna elements in a With the wideband and high-gain performance, the proposed MIMO antenna achieves isolation higher than 15 dB from 57.0 to 71.0 GHz through the help of orthogonal polarization and metal vias insertion simultaneously.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

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Wideband Millimeter-Wave MIMO Antenna with a Loaded Dielectric Cover for High-Gain Broadside Radiation

Chen,

Song,

Wang

2023

Electronics

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In a millimeter-wave terminal device, the use of a radome degrades the radiating performance of the broadside antenna, especially for the MIMO antenna system. In this study, a dielectric cover is de-signed and investigated to enhance the broadside gain of a millimeter-wave MIMO antenna, while keeping its wideband and high isolation performance. Firstly, a compact wideband ladder-shaped slot antenna is proposed with 21.9% bandwidth. The effectiveness of the dielectric cover design criteria over the wideband antenna is investigated. Then, this wideband antenna element is expanded to a 2 × 2 MIMO antenna by forming a center-symmetric structure and isolating it via the inserted metal vias. By loading the dielectric cover, this millimeter-wave MIMO antenna is verified with enhanced broadside gain for more than 2.1 dB. With the measured impedance bandwidth of 21.9% (57.0–71.0 GHz), peak broadside gain of 12.3 dBi, and high isolation over 15 dB, the proposed MIMO antenna is suitable for wireless gigabit terminal devices.

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Section: Fabrication and Measurementmentioning

confidence: 99%

Section: Fabrication and Measurementmentioning

confidence: 99%

Wideband Millimeter-Wave MIMO Antenna with a Loaded Dielectric Cover for High-Gain Broadside Radiation

Chen,

Song,

Wang

2023

Electronics

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“…It should be noted that this is the worst case (largest minimum separation required) we came across in all related research projects conducted by the authors and others in our research group. In [6] where the base antenna is a Fabry-Perot resonant cavity antenna, the gap between the top surface of the base antenna and the lower surface of the metasurface pair was 8mm (< λ • /3 @ 11GHz) and in more recent projects where the base antenna was a antenna the minimum gap required was zero but a fraction of millimeter was allowed in the prototype to allow easy rotation of the metasurfaces without touching the base antenna [41].…”

Section: B 2d Beam-steering Systemmentioning

confidence: 99%

Controlling the Most Significant Grating Lobes in Two-Dimensional Beam-Steering Systems With Phase-Gradient Metasurfaces

Singh

Afzal

Kovaleva

et al. 2020

IEEE Trans. Antennas Propagat.

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High-directivity antenna systems that provide 2D beam steering by rotating a pair of phase-gradient metasurfaces in the near field of a fixed-beam antenna, hereafter referred to as Near-Field Meta-Steering systems, are efficient, planar, simple, short, require less power to operate and do not require antenna tilting. However, when steering the beam, such systems generate undesirable dominant grating lobes, which substantially limit their applications. Optimizing a pair of these metasurfaces to minimize the grating lobes using standard methods is nearly impossible due to their large electrical size and thousands of small features leading to high computational costs. This paper addresses this challenge as follows. Firstly, it presents a method to efficiently reduce the strength of "offending" grating lobes by optimizing a supercell using Floquet analysis and multi-objective particle swarm optimization. Secondly, it investigates the effects of the transmission phase gradient of PGMs on radiation-pattern quality. It is shown that the number of dominant unwanted lobes in a 2D beam-steering antenna system and their levels can be reduced substantially by increasing the transmission phase gradient of the two PGMs. This knowledge is then extended to 2D beam-steering systems, where we demonstrate how to substantially reduce all grating lobes to a level below −20 dB for all beam directions, without applying any amplitude tapering to the aperture field. When steering the beam of two Meta-Steering systems with peak directivities of 30.5 dBi and 31.4 dBi, within a conical volume with an apex angle of 96 • , the variation in directivity is 2.4 dB and 3.2 dB, respectively. We also demonstrate that beam-steering systems with steeper gradient PGMs can steer the beam in a wider range of directions, require less mechanical rotation of metasurfaces to obtain a given scan range and their beam steering is faster. The gap between the two metasurfaces in a Near-field Meta-Steering system can be reduced to one-eighth of a wavelength with no significant effect on pattern quality.

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“…[1][2][3][4][5][6] The electromagnetic band gap (EBG) and defected ground structure (DGS), or other metamaterials, has demonstrated a good potential in antenna to reduce size or improve efficiency, or achieve other performance. [7][8][9][10][11][12][13][14][15][16][17][18][19] Among these structures, EBG structure is widely applied in antenna systems. Combining reconfigurable antenna technology with EBG, a series of limitations existing in the conventional schemes have been broken through, and some high performance antennas have been developed.…”

Section: Introductionmentioning

confidence: 99%

Integrated design of large and medium‐sized low profile frequency reconfigurable antenna array

Deng

Ding

et al. 2021

Int J RF Microw Comput Aided Eng

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In this paper, in order to solve the limitations of conventional technology schemes, a new scheme for large and medium-sized frequency reconfigurable antenna array (FRAA) with low profile is proposed by combining advanced technologies such as new electromagnetic materials, reconfigurable antenna and integrated design. The proposed FRAA operating in X and Ku bands consists of a 4 × 4 antenna array, a w ide-band feed network, a dual-band electromagnetic band gap (EBG) plate and integrated bias network. The distance between antenna array and reflective plate has been reduced by 80.0% by applying an EBG structure. The influence of bias network on antenna performance is effectively reduced, and the performance of X/Ku two-band antenna is ensured through the integrated optimization design of the bias network, EBG reflector plate and antenna array. Both simulation and test results show that the proposed FRAA has good performance.

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Broadband Partially Reflecting Superstrate-Based Antenna for 60 GHz Applications

Cited by 32 publications

References 19 publications

Wideband Millimeter-Wave MIMO Antenna with a Loaded Dielectric Cover for High-Gain Broadside Radiation

Wideband Millimeter-Wave MIMO Antenna with a Loaded Dielectric Cover for High-Gain Broadside Radiation

Controlling the Most Significant Grating Lobes in Two-Dimensional Beam-Steering Systems With Phase-Gradient Metasurfaces

Integrated design of large and medium‐sized low profile frequency reconfigurable antenna array

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