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Quarterly published in print and online "Inventi Impact: Antennas & Propagation" publishes high quality unpublished as well as high impact pre-published research and reviews catering to the needs of researchers and professionals. It focuses on multidimensional aspects of antennas & propagation, particularly - antennas analysis and design, antennas array, antennas simulation, beam control and steering, etc.
Full dimension MIMO (FD-MIMO) is one of the key technologies presently studied in the 3GPP for the next generation long-term\nevolution advanced (LTE-A) systems. By incorporating FD-MIMO into LTE/LTE-A systems, it is expected that system throughput\nwill be drastically improved beyond what is possible in conventional LTE systems. This paper pre sets details on the 2D active\nantenna array design for FD-MIMO systems supporting 32 antenna elements. The FD-MIMO system allows for dynamic and\nadaptive precoding to be performed jointly across all antennas thus achieving more directional transmissions in the azimuth and\nelevation domains simultaneously, to a larger number of users. Finally, we discuss 2D antenna array port virtualization techniques\nfor creating beams with wide coverage, necessary for broadcasting signals to all users within a sector, such as the CRS (Common\nReference Signal)....
In this letter, a novel 3D multi-beam reconfigurable THz loop antenna capable of steering\nits main beam in the semi-sphere space................................
Effective diagnostics with ground penetrating radar (GPR) is strongly dependent on the amount and quality of available data as well\r\nas on the efficiency of the adopted imaging procedure. In this frame, the aim of the present work is to investigate the capability of a\r\ntypical GPR system placed at a ground interface to derive three-dimensional (3D) information on the features of buried dielectric\r\ntargets (location, dimension, and shape). The scatterers can have size comparable to the resolution limits and can be placed in\r\nthe shallow subsurface in the antenna near field. Referring to canonical multimonostatic configurations, the forward scattering\r\nproblem is analyzed first, obtaining a variety of synthetic GPR traces and radargrams by means of a customized implementation of\r\nan electromagnetic CAD tool. By employing these numerical data, a full 3D frequency-domain microwave tomographic approach,\r\nspecifically designed for the inversion problem at hand, is applied to tackle the imaging process. The method is tested here by\r\nconsidering various scatterers, with different shapes and dielectric contrasts.Theselected tomographic results illustrate the aptitude\r\nof the proposed approach to recover the fundamental features of the targets even with critical GPR settings....
This paper proposes a segmented parabolic curved antenna, which can be used in the base\nstation of a 60 GHz millimeter wave communication system, with an oblique Yagi antenna as a feed.\nBy analyzing the reflection and multi-path interference cancellation phenomenon when the main\nlobe of the Yagi antenna is reflected, the problem of main lobe splitting is solved. 3D printing\ntechnology relying on PLA (polylactic acid) granule raw materials was used to make the coaxial\nconnector bracket and segmented parabolic surface. The reflective surface was vacuum coated (via\naluminum evaporation) with low-loss aluminum. The manufacturing method is environmentally\nfriendly and the structure was printed with 0.1 mm accuracy based on large-scale commercial\napplications at a low cost. The experimental results show that the reflector antenna proposed in this\npaper achieves a high gain of nearly 20 dBi in 57â??64 GHz frequency band and ensures that the main\nlobe does not split....
In this design, a novel inverted F antenna with a low profile feed structure is proposed for millimeter-wave (mmW) applications.
The array element consists of a printed inverted F antenna and a L-shaped parasitic deflector, approximately forming a structure
similar to the Yagi-Uda antenna. The gain could be increased and the impedance bandwidth could be broadened by the structure.
And, it is important to realize the miniaturization of the antenna element by bending the parasitic deflector based on the
traditional deflector without affecting the performance. The proposed antenna has a low feed substrate height (0.254mm0.02λ0),
which makes it easy to integrate with planar circuits. As proof, a 1 × 4 array model with an impedance bandwidth of 20.5%
(23.0–28.3 GHz) is designed and measured. The inverted F array demonstrated is an important candidate for mmW applications
due to its wide bandwidth, miniaturization, ease of integration with planar circuits, and low manufacturing cost....
This study introduces a new design of planar antenna array for ISM band applications\nat 2.4 GHz. This prototype is switched beam antenna, namely planar antenna\nwith four meandered slotted triangular elements (PAFMSTE), which is proposed for\nwireless indoor applications. The Base Station (BS) equipped with this planar antenna\nis preferred to be at the center position on the room ceiling to cover all sectors of\nthe room. It is designed to use four directional triangular elements arranged to form\na square planar antenna array. The PAFMSTE is used to obtain optimal directivity in\nfour directions in azimuth plane with 3 dB beamwidth of 90Ã?Å¡ at a specific orientation\nof 30Ã?Å¡ in elevation plane. Switched parasitic technique is used to enable PAFMSTE to\nsteer a directional beam through four locations by using four PIN diodes switches.\nThe High Frequency Structure Simulator (HFSS) is used as an efficient simulation\ntool to optimize the performance of the PAFMSTE antenna. The fabrication and\nmeasurements of the PAFMSTE antenna are introduced. The proposed antenna enable\nradio positioning via Angle of Arrival (AOA) information collected from nearby\ndevices. Then, the CramÃ?Â©r-Rao Bound (CRB) is presented for AOA estimation using\nidentically and equally spaced antenna elements. The CRB depends on the directivity,\nwhere the maximum values of CRB are 1.35 Ã?â?? 10Ã¢Ë?â??3 and 8 Ã?â?? 10Ã¢Ë?â??3 at HPBW of 60Ã?Å¡ and\n90Ã?Å¡, respectively....
A dipole antenna based on a balun bandpass filter (BPF) is developed in this paper. The balun BPF employs two U-shaped
resonators settled on the left side of the open-circuited transmission line and two L-shaped stubs to produce signals with equal
amplitude and inverse phase. In this way, the volume of the balun BPF is reduced by half, and the distance between two output
ports is dramatically decreased. Then, the balun BPF is integrated with a dipole. Instead of the traditional Γ-shaped line with a wide
balun ground, two thin microstrip lines with width of 1mm are adopted to connect the dipole and the balun BPF. The antenna
bandwidth is further extended due to the fusion of the resonance of the dipole and balun BPF. As a result, the proposed antenna
can operate from 4350 to 5025MHz (covering the n79 band of 5G NR, 4400 MHz–5000 MHz), yielding a good filtering performance
in the stopband. The measured half-power beamwidth is ranging from 61° to 63° and the measured gain is ranging from
7.95 to 8.5 dBi in the passband. This new balun BPF and the dual-polarized dipole based on it have great potential to be applied in
5G MIMO systems....
This paper proposes a microstrip patch antenna based on the left-handed metamaterial concept, using planar periodic geometry,\nwhich results in improved characteristics. This periodic geometry is derived from fractal shapes, which have been widely used in\nantenna engineering. The metamaterial property was obtained as a result of the double-fractal structure on both the upper and\nthe bottom sides of the antenna. The final structure has been optimized to enhance bandwidth, gain, and radiation characteristics\nof the microstrip antenna. This combination significantly improved antenna performance; our design could support an ultrawide\nbandwidth ranging from 4.1 to 19.4GHz, demonstrating higher gain with an average value of 6 dBi over the frequency range and a\npeak of 10.9 dBi and a radiation capability directed in the horizontal plane of the antenna....
A novel butterfly-shaped patch antenna for wireless communication is introduced in this paper. The antenna is designed for\nwideband wireless communications and radio-frequency identification (RFID) systems. Two symmetrical quasi-circular arms and\ntwo symmetrical round holes are incorporated into the patch of a microstrip antenna to expand its bandwidth.The diameter and\nposition of the circular slots are optimized to achieve a wide bandwidth. The validity of the design concept is demonstrated by\nmeans of a prototype having a bandwidth of about 40.1%. The return loss of the butterfly-shaped antenna is greater than 10 dB\nbetween 4.15 and 6.36GHz.The antenna can serve simultaneously most of the modern wireless communication standards....
A high-temperature superconductor (HTS) microstrip antenna array with right-hand circular polarization is proposed for space\ncommunications. The proposed HTS antenna array can achieve high efficiency, which is able to reduce the antennaÃ¢â?¬â?¢s loss. The array\nconsists of 16 antenna elements being fed by a T-network. A pair of symmetric meander slots is used in each antenna element\nto broaden the input matching bandwidth. A controllable cryostat is used as the refrigeration for HTS. The experiment shows\nthat the gain of the proposed HTS antenna is 8.39 dB, whose 10 dB return loss bandwidth is 2.2% ranging from 5.75GHz to\n5.87GHz. In comparison with a traditional conductor antenna array having the same configuration, the proposed array has an\n8.1 dB improvement in the gain and a 69.2% enhancement in the radiation efficiency....
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