A Novel Center-Fed SIW Inclined Slot Antenna for Active Phased Array
TL;DR: In this article, a center-fed substrate integrated waveguide (SIW) inclined slot array antenna is designed for a one-dimensional active phased array and a novel coaxial-to-SIW transition is employed to realize the central feed for enhancing bandwidth.
Abstract: In this paper, a center-fed substrate integrated waveguide (SIW) inclined slot array antenna is designed for a one-dimensional active phased array. A novel coaxial-to-SIW transition is employed to realize the central feed for enhancing bandwidth. The antenna prototype printed onto a single-layer Rogers 5870 is composed of 32 × 16 inclined slots working at Ku-band. As shown in measured result, the bandwidth with return loss < −10 dB is from 16.6 to 17.1 GHz, and the sidelobe levels of arrays are below −24.8 dB at 16.8 GHz in H planes. The measured gain is 31.8 dB at 16.8 GHz with the aperture efficiency of 65%. The active phased array is assembled by an antenna and 32 Tx/Rx modules, and the measured results show that the main lobe can obtain a wide-angle scanning from −45 to 45 degrees in E planes. The antenna array is suitable for low profile small active phased array radars and communication systems that require spatial wide-angle scanning.
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TL;DR: The proposed novel THz near-field probes enable room-temperature sub-wavelength resolution coherent imaging with a 3.4 THz quantum cascade laser, paving the way to compact and versatile THz imaging systems and promising to bridge the gap in spatial resolution from the nanoscale to the diffraction limit.
Abstract: Near-field imaging with terahertz (THz) waves is emerging as a powerful technique for fundamental research in photonics and across physical and life sciences. Spatial resolution beyond the diffraction limit can be achieved by collecting THz waves from an object through a small aperture placed in the near-field. However, light transmission through a sub-wavelength size aperture is fundamentally limited by the wave nature of light. Here, we conceive a novel architecture that exploits inherently strong evanescent THz field arising within the aperture to mitigate the problem of vanishing transmission. The sub-wavelength aperture is originally coupled to asymmetric electrodes, which activate the thermo-electric THz detection mechanism in a transistor channel made of flakes of black-phosphorus or InAs nanowires. The proposed novel THz near-field probes enable room-temperature sub-wavelength resolution coherent imaging with a 3.4 THz quantum cascade laser, paving the way to compact and versatile THz imaging systems and promising to bridge the gap in spatial resolution from the nanoscale to the diffraction limit.
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TL;DR: A new technical approach to design wideband antennas by using radiant slots, which are usually considered narrow-band structures, is presented, based on the slope of the S-parameters and the impedance shown by the slots to achieve the broadband-impedance performance.
Abstract: In the last decade, substrate integrated waveguide (SIW)-based solutions have been successfully introduced as a proper compromise between conventional strip and waveguide technologies, allowing the implementation of typical waveguide structures on planar circuits, as slot arrays. In this letter, a new technical approach to design wideband antennas by using radiant slots, which are usually considered narrow-band structures, is presented. Commonly, an equivalent circuit composed of admittances, whose conductance and susceptance are computed by well-known analytic methods, is widely used to design slot arrays. However, they are aimed at narrow-band services. The new synthesis method is based on the slope of the S -parameters and the impedance shown by the slots to optimize their position and distribution along the SIW to achieve the broadband-impedance performance, as well as a least-mean-square (LMS) system to mitigate the beam-squint effect and not to degrade the beam bandwidth. The novel antenna presents a relative impedance bandwidth above 20%, by using four slots, while keeping the beam bandwidth and a radiation efficiency higher than $-$ 0.7 dB.
5 citations
Cites background from "A Novel Center-Fed SIW Inclined Slo..."
...However, wideband performance can be obtained when slots are shaped differently from each other [2], [3], and center-feeding methods can also be implemented in SIW [4] to extend the bandwidth....
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TL;DR: In this paper , a high performance substrate integrated waveguide (SIW) slotted array antenna with low sidelobe level and optimum gain at 28 GHz is designed, and experimental results are presented with simulated data.
Abstract: |A high performance substrate integrated waveguide (SIW) slotted array antenna with low sidelobe level and optimum gain at 28 GHz is designed, and experimental results are presented with simulated data. In order to achieve a low sidelobe level, Chebyshev power coefficients in the form of slot displacements are applied to the SIW array antenna. A MATLAB program has been written to (cid:12)nd these slot displacements. This work entails investigating and designing the optimum microstrip to SIW transition over the Ka-band, designing a 1 (cid:2) 8 slotted SIW array antenna, and (cid:12)nally applying the Chebyshev power coefficients to the slots of the 1 (cid:2) 8 SIW array antenna. The fabricated prototype of a 1 (cid:2) 8 SIW slotted array antenna is tested, and its performance is studied in terms of gain and half power beam width (HPBW), compared with simulations. The measured results of the 1 (cid:2) 8 slotted SIW array antenna at 28 GHz have a j S 11 j of better than (cid:0) 20 dB, a gain of 13 dB, and an HPBW of 17 ◦ . The overall dimensions of the design at 28 GHz are 7 : 143 mm (cid:2) 51 : 8 mm (cid:2) 0 : 254 mm (0 : 667 (cid:21) o (cid:2) 4 : 84 (cid:21) o (cid:2) 0 : 023 (cid:21) o = 0 : 0766 (cid:21) 3 o mm 3 ).
3 citations
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TL;DR: In this article, the authors provide an overview of the recent advances in the modelling, design and technological implementation of SIW structures and components, as well as their application in the development of circuits and components operating in the microwave and millimetre wave region.
Abstract: Substrate-integrated waveguide (SIW) technology represents an emerging and very promising candidate for the development of circuits and components operating in the microwave and millimetre-wave region. SIW structures are generally fabricated by using two rows of conducting cylinders or slots embedded in a dielectric substrate that connects two parallel metal plates, and permit the implementation of classical rectangular waveguide components in planar form, along with printed circuitry, active devices and antennas. This study aims to provide an overview of the recent advances in the modelling, design and technological implementation of SIW structures and components.
1,129 citations
TL;DR: In this article, a low side-lobe substrate-integrated-waveguide (SIW) antenna array is presented at the 28 GHz band using broadband unequal feeding network for millimeter-wave (mm-wave) handset devices.
Abstract: A low side-lobe substrate-integrated-waveguide (SIW) antenna array is presented at the 28-GHz band using broadband unequal feeding network for millimeter-wave (mm-wave) handset devices. The ground-plane size of the proposed antenna is fixed to half of the size of the Samsung Galaxy Note 4. The antenna array has been implemented with a multilayer structure created by stacking three substrates and a copper plate. An 8-way SIW feeding network with broadband 4-stage T-junction dividers and a cavity-backed antenna are investigated to obtain broadband performance. The proposed unequal T-junction dividers with phase compensation are introduced and designed for various output ratios. Applying Taylor beam-pattern synthesis in the 8-way SIW feeding network, low side-lobe performance is achieved. The measured result of the fabricated antenna has 2.3 GHz bandwidth within $\text{S}_11\,{ . The fabricated antenna can be performed with a gain up to 13.97 dBi with a low cross-polarization and symmetrical fan beam radiation patterns with low side-lobe levels. Most of the measured results are validated with the simulated results. The proposed antenna array provides low cost, broadband performance, and good radiation performances with low side-lobe levels for mm-wave handset devices.
169 citations
"A Novel Center-Fed SIW Inclined Slo..." refers background in this paper
...The wideband SIW-to-rectangular waveguide (RWG) transition is proposed to ensure the performance of insertion loss in [15, 16]....
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TL;DR: This work exploits the inherent electrical and thermal in-plane anisotropy of a flexible thin flake of black-phosphorus to demonstrate the first concrete application of a phosphorus-based active Terahertz device, for pharmaceutical and quality control imaging of macroscopic samples, in real-time and in a realistic setting.
Abstract: The ability to convert light into an electrical signal with high efficiencies and controllable dynamics, is a major need in photonics and optoelectronics. In the Terahertz (THz) frequency range, with its exceptional application possibilities in high data rate wireless communications, security, night-vision, biomedical or video-imaging and gas sensing, detection technologies providing efficiency and sensitivity performances that can be "engineered" from scratch, remain elusive. Here, by exploiting the inherent electrical and thermal in-plane anisotropy of a flexible thin flake of black-phosphorus (BP), we devise plasma-wave, thermoelectric and bolometric nano-detectors with a selective, switchable and controllable operating mechanism. All devices operates at room-temperature and are integrated on-chip with planar nanoantennas, which provide remarkable efficiencies through light-harvesting in the strongly sub-wavelength device channel. The achieved selective detection (∼5-8 V/W responsivity) and sensitivity performances (signal-to-noise ratio of 500), are here exploited to demonstrate the first concrete application of a phosphorus-based active THz device, for pharmaceutical and quality control imaging of macroscopic samples, in real-time and in a realistic setting.
128 citations
TL;DR: In this paper, single and dual-slot antennas are described, which operate at 10 GHz and 5 GHz, respectively, and they are integrated on microwave laminate, and single-and dual-slotted.
Abstract: Waveguide slot antennas integrated on microwave laminate are presented, and single and dual slot antennas are described, which operate at 10 GHz.
78 citations
TL;DR: In this article, a metal-topological insulator-metal subwavelength structure is proposed to achieve high sensitivity and fast response at the self-powered and bias mode, opening up a route for large area, fast imaging.
Abstract: Metal‐topological insulator–metal subwavelength structure is proposed to achieve ultrasensitivity, room temperature terahertz photodetectors. Due to peculiar properties of topological surface state (TSS), direct detection of low energy photons can be enabled by a localized THz field, exhibiting both high sensitivity and fast response at the self‐powered and the bias mode, opening up a route for large area, fast imaging.
76 citations
"A Novel Center-Fed SIW Inclined Slo..." refers methods in this paper
...According to the experimental formula for the normalized width of the equivalent waveguide [8], parameters of the SIW are chosen as a = 7....
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