Slot Array Antenna Research Articles

Differentially-Fed Slot Array Antenna Backed With High-Order Resonating Cavity Loading Slow-Wave Top–Bottom Double Pins

Differentially-Fed Slot Array Antenna Backed With High-Order Resonating Cavity Loading Slow-Wave Top–Bottom Double Pins

2-D Epsilon-Near-Zero (ENZ) Feeding Network for High-Gain Millimeter-Wave Slot Antenna Array Using Bulk Silicon MEMS Technology

2-D Epsilon-Near-Zero (ENZ) Feeding Network for High-Gain Millimeter-Wave Slot Antenna Array Using Bulk Silicon MEMS Technology

Efficiency enhancement of a circularly polarised slotted waveguide antenna array for Sub-THz applications

Efficiency enhancement of a circularly polarised slotted waveguide antenna array for Sub-THz applications

A 220 GHz High-Gain Low-Cost Slot Array Antenna With Integrated Fabry–Perot Cavity

A 220 GHz High-Gain Low-Cost Slot Array Antenna With Integrated Fabry–Perot Cavity

A Wideband High-Gain Sawtooth Slot Array Antenna with Frequency-Scanning at Lower Frequency and Fixed-Beam at Higher Frequency

A Wideband High-Gain Sawtooth Slot Array Antenna with Frequency-Scanning at Lower Frequency and Fixed-Beam at Higher Frequency

Research into the Impact of Phase Shifter Failures on the Characteristics of Slotted Waveguide Array Antenna

Introduction. Currently, the impact of phase shifter (PS) failures on the characteristics of phased antenna arrays, slotted waveguide array antenna (SWAA) in particular, represents a significant problem. A review of publications shows that insufficient attention has been paid to PS failures.Aim. To investigate the characteristics of a SWAA in the event of PS failures, when their phase takes a value equal to zero instead of the required value.Materials and methods. The methods of statistical modeling methods were used to study the impact of failures on SWA characteristics. Calculations were carried using the Mathcad 15 software package.Results. An algorithm for statistical modeling of the impact of PS failures on SWAA characteristics is proposed. A relationship that connects the radiation pattern with the volume of the statistical sample and the number of failed PSs is given. The malfunctions of emitters from 5 to 35 out of 50 elements were studied. Changes in the following characteristics were obtained: standard deviation – from 0.064 to 0.18, radiation pattern width – from 8 to 18 %, the level of side lobes – from 13 to 59 %, radiation power – from 0.9 to 0.3.Conclusion. The results obtained can be used in radio-electronic systems with antenna arrays at the stage of their development. Future work will address PS failures with phases being established randomly and with random values, as well as the case of PS failures where power does not pass into the emitter. Another important direction concerns compensation of distortions resulting from failures of antenna elements.

A low radar cross section antenna array based on a liquid metal metasurface

AbstractA low RCS (radar cross section) slot array antenna based on a liquid metal metasurface is proposed. The metasurface consists of 6 × 6 nested ring‐shaped element. The inner ring with a checkerboard distribution can realise 180° ± 37° phase difference, which can effectively reduce the scattering performances for the slot array. The outer and inner ring together can excite more energy from the slot array, thus resulting in increased radiation gains. Therefore, by changing the layout of liquid metal on the metasurface, scattering and radiation enhancement modes can be switched. The measured results show that in the scattering mode, the RCS can be reduced from 8.1 to 17 GHz. While in the radiation enhancement mode, the proposed array with the metasurface can achieve a −10‐dB impedance bandwidth of 9.4–11.2 GHz (17.4%) with a maximum gain of 8.12 dBi. Compared with the slot array without the metasurface, the realised gain is enhanced by 1.2 dBi from 6.9 dBi. The measured results correspond well with the simulated ones.

Enhancing long-range radar (LRR) automotive applications: Utilizing metasurface structures to improve the performance of K-band Longitudinal Slot Array Antennas

In this paper, we introduce a groundbreaking modification to a K-band substrate integrated waveguide (SIW) Longitudinal Slot Array Antenna for Vehicle-to-Everything (V2X) applications, particularly long-range radar (LRR) in the automotive industry. Our approach harnesses an elliptic metasurface capable of distinguishing between TE and TM modes in relation to radiation direction. By utilizing metasurfaces, we effectively address the issue of mutual coupling between antenna elements, which often results in subpar antenna performance. This modification focuses on improving various antenna characteristics, including frequency bandwidth (expanded by approximately four times), sidelobe level (reduced by 4 dB), aperture efficiency (increased to about 44%), and cross-polarization (reduced by an average of 10 dB). In essence, the results demonstrate that the increased number of longitudinal elements can be effectively enhanced by utilizing the metasurface structure, while maintaining an acceptable level of efficiency. As an illustrative case, we design a 1 × 32-element Longitudinal Slot Array Antenna using the Elliott method operating at 24.3 GHz, with the antenna size measuring 12.5 × 154 mm2. Experimental measurements validate our design, showcasing a 10 dB return loss bandwidth of 24.05–24.45 GHz, a maximum gain of 14.45 dBi, a sidelobe level of 24.5 dB, cross-polarization exceeding 30 dB, and an impressive aperture efficiency of 65%.

A compact high‐gain slot antenna array with a bidirectional broadside radiation pattern

AbstractA novel bidirectional broadside slot antenna array is proposed in this letter. The outstanding merits of this antenna array lie in the minimum width and the highest gain‐to‐area ratio (G/A) compared to previous works. The ingenious combination of the radiation mode and the transmission mode of slots is adopted, eliminating the design of the feed network. Thus, a simple and compact configuration is obtained. Moreover, two metal plates are added vertically at the sides of the slot array, with a more homogeneous radiation aperture and a higher G/A. With the 3D structure, a compact volume of the antenna array is ensured. For performance evaluation, our proof‐of‐concept design is fabricated with a cuboid dimension of 1.94λ0 × 0.12λ0 × 0.12λ0, where λ0 denotes the wavelength in free space at the centre frequency. An impedance bandwidth of 2.38 to 2.49 GHz is achieved, with a maximum gain of 9.7 dBi and a higher G/A of 39.5. The advantages including compact size and high G/A are paving the path for the potential application of communications in long and narrow spaces.

A V-Band 45° Linearly Polarized Gap Waveguide-Based Corporate-feed Slot Array Antenna with High Overall Performance and Robustness

A V-Band 45° Linearly Polarized Gap Waveguide-Based Corporate-feed Slot Array Antenna with High Overall Performance and Robustness

Effective Design of an Array of Coupling Slots with a Reflection-canceling Wall for a Parallel-plate Slot Array Antenna

Effective Design of an Array of Coupling Slots with a Reflection-canceling Wall for a Parallel-plate Slot Array Antenna

AI-Based Investigation and Mitigation of Rain Effect on Channel Performance With Aid of a Novel 3D Slot Array Antenna Design for High Throughput Satellite System

AI-Based Investigation and Mitigation of Rain Effect on Channel Performance With Aid of a Novel 3D Slot Array Antenna Design for High Throughput Satellite System

Wideband RCS Reduction for Circular-polarized Slot Array Antennas Based on Composite Metasurface

Wideband RCS Reduction for Circular-polarized Slot Array Antennas Based on Composite Metasurface

Contactless Air-Filled Substrate Integrated Cavity-Backed Slot Antenna Array With Improved Printed Ridge Gap Waveguide Feeding Network

Contactless Air-Filled Substrate Integrated Cavity-Backed Slot Antenna Array With Improved Printed Ridge Gap Waveguide Feeding Network

A Low RCS Waveguide Slot Antenna array with Metamaterial Absorber

We propose a novel design to reduce the radar cross section (RCS) of ridged waveguide slot antenna array with metamaterial absorber (MMA). The MMA consists of metallic pattern and solid metal on sides of a dielectric slab, of which the absorbing characteristics and mechanism are analyzed. The PEC ground plane of a ridged waveguide slot antenna array is covered by MMA. Both the simulated and measured results show that compared with the waveguide slot antenna array with a PEC ground plane, the RCS of proposed antenna array are reduced dramatically without degradation of antenna performance. Combining with the bandpass frequency selective surfaces technology, the guideline illustrated by the proposed examples will serve as a good candidate for the future design of low RCS antenna.

High-Order Resonating Cavity-Backed Slot Antenna Array Based on Contactless Air-Filled Substrate Integrated Waveguide and Transition to Inverted Grounded Coplanar Gap Waveguide

High-Order Resonating Cavity-Backed Slot Antenna Array Based on Contactless Air-Filled Substrate Integrated Waveguide and Transition to Inverted Grounded Coplanar Gap Waveguide

Circularly Polarized Double-walled SIW Fractal Slot and Hexagonal Ring Slot Antenna Array for X-band Satellite Applications

Circularly Polarized Double-walled SIW Fractal Slot and Hexagonal Ring Slot Antenna Array for X-band Satellite Applications

A Compact 16-Port Fractal Shaped Slot Antenna Array for 5G Smart Phone Communications

In this manuscript, a 16-port compact multi-antenna array for fifth generation (5G) communications is presented. The proposed antenna offers high data rate communication, by using MIMO (multiple-input-multiple-output) wireless technology. Efficient bandwidth enhancement techniques are used to achieve wider bandwidth response i.e., 3.4-3.8 GHz within sub-6GHz. This system is realized over low-cost FR-4 laminate having dimensions of 64mm × 131mm. The fractal shape slotted radiators and open-ended square ring (OESR) isolating structures achieves at least 25dB isolations among antenna pairs while maintaining wideband response. The optimum isolation, low-cost design profile, matched scattering parameters without compromising compactness and acceptable specific absorption rate (SAR) makes this system a suitable candidate for 5G smart phone communications.

Ultra-low SLL slotted waveguide antenna array using Chebyshev aperture distribution function for MM-wave tracking radar applications

A non-uniform aperture distribution slotted waveguide antenna is presented. The slotted waveguide antenna array is chosen for its ease for aperture distribution control and the flexibility of gain adjustment. Multiple aperture distribution functions, including uniform, binominal, Chebyshev, and Blackman, have been extensively investigated to achieve the best possible side lobe suppression. These distribution functions have been converted to slot displacement from the center line of the antenna. Number of slots in the proposed array is chosen to be eight to satisfy the required gain for mm-wave radar tracking application. The proposed antenna is simulated and optimized using the full wave simulator package (CSTMWS). Rounded edge slots are adapted instead of the sharp ones, as they are more applicable for the CNC fabrication process. An eight-slot waveguide antenna is fabricated and gold-plated, considering the Chebyshev distribution approach. The proposed design achieves very stable radiation characteristics and performance over the operating bandwidth, which extends from 33.6 GHz up to 35.9 GHz. At 35 GHz, the total realized gain of the overall antenna is found to be 13.4 dBi, with an overall radiation efficiency of 95.21 %. An obvious low SLL of −30 dB is obtained at the frequency of 35 GHz. The low side lobe level parameter is very crucial for radar applications as it enhances the overall target SNR and reduces false target observations. The pre-stated antenna characteristics make it a good candidate for mm-wave radar applications and point-to-point communications (P2P).

Моделирование щелевой двухэлементной антенны со связанным питанием

A micro-strip fed slot antenna array for the ISM band was built using standard formulas for calculating various antenna parameters. Half power beamwidth 57°, throughput about 7.7%. This is obtained by matching the impedance and the high level of the surface waves. To expand the bandwidth, a direct-coupled power was used, which provides the largest bandwidth, is fairly easy to model, and has low spurious radiation. A directivity of 2.01 dB was achieved. This is a fairly high figure, although an increase in directivity can also be obtained by using a different material and thickness of the substrate. HFSS software examines and analyzes antenna characteristics, including voltage standing wave ratio, return loss, and far-field radiation patterns.