scholarly journals An Improvement Approach for Wide-Angle Impedance Matching Using ELC Metasurface Slabs for SIW Slot Array Antennas

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Yi Liu ◽  
Hu Yang ◽  
Zusheng Jin ◽  
Jiang Zhu
Keyword(s):  
Mutual Coupling ◽  
Impedance Matching ◽  
Resonance Region ◽  
Wide Angle ◽  
Beam Scanning ◽  
Linear Region ◽  
Antenna Structure ◽  
Structured Materials ◽  
Array Antennas ◽  
X Band

The effects of mutual coupling in beam scanning arrays increase degradation in gain as the beam is scanned off the broadside. A simple and effective approach for a deployed SIW slot array antenna through the use of artificially structured materials is proposed to improve its performance of wide-angle scanning in the E-plane. Metasurface slabs of one-tenth wavelength electric-inductive-capacitive (ELC) resonators are vertically placed halfway between the adjacent waveguides without changing the antenna structure to realize wide-angle impedance matching (WAIM). The ELC metasurface is designed to operate at a linear region rather than at a resonance region to use its transmission property for greatly weakening mutual couplings. Inserting metasurface slabs between two adjacent waveguides to reduce the mutual coupling can achieve impedance matching at large scan angles. A 10 × 10 SIW slot array operating at X-band is modelled and simulated to study how the vertically placed ELC metasurface slabs over the antenna affect the array’s beam scanning performance. The simulated results show that the scan range of the antenna is extended from −50° to 50° to −70° to 70° under the criteria that radiating efficiency is greater than 80%.

3D Wide-Angle Impedance Matching for X-Band Phased Array

2021 ◽  
Author(s):  
Brandon Sun ◽  
Renaud Loison ◽  
Raphael Gillard ◽  
Eric Estebe ◽  
Christian Renard
Keyword(s):  
Phased Array ◽  
Impedance Matching ◽  
Wide Angle ◽  
X Band

scholarly journals Mutual Coupling Reduction in Phased Array Antennas Applying High-Impedance Surface at X Band

2020 ◽  
Vol 19 (1) ◽  
pp. 118-128
Author(s):  
José Bruno O. de Araújo ◽  
Vanessa P. R. Magri Souza ◽  
Tadeu N. Ferreira ◽  
Leni J. de Matos ◽  
Glaucio L. Siqueira ◽  
...  
Keyword(s):  
Mutual Coupling ◽  
Phased Array ◽  
Impédance Surface ◽  
Impedance Surface ◽  
Phased Array Antennas ◽  
High Impedance ◽  
Array Antennas ◽  
X Band ◽  
High Impedance Surface ◽  
Mutual Coupling Reduction

Wide angle impedance matching metamaterials for waveguide-fed phased-array antennas

2010 ◽  
Vol 4 (8) ◽  
pp. 1063 ◽  
Author(s):  
S. Sajuyigbe ◽  
M. Ross ◽  
P. Geren ◽  
S.A. Cummer ◽  
M.H. Tanielian ◽  
...  
Keyword(s):  
Phased Array ◽  
Impedance Matching ◽  
Wide Angle ◽  
Phased Array Antennas ◽  
Array Antennas

Laser micro-machined 28 GHz broad band single feed microstrip antenna for 5G mm-wave applications

Circuit World ◽  
2019 ◽  
Vol 46 (1) ◽  
pp. 6-12
Author(s):  
Melvin C. Jose ◽  
Radha Sankararajan ◽  
Sreeja B.S. ◽  
Pratap Kumar Pratap Kumar
Keyword(s):  
Antenna Array ◽  
Mutual Coupling ◽  
Impedance Matching ◽  
Broad Band ◽  
Array Antenna ◽  
Single Element ◽  
Total Efficiency ◽  
Substrate Thickness ◽  
Antenna Structure ◽  
Content Type

Purpose This paper aims to propose a laser micro-machined 4 × 4 elements microstrip array antenna suitable for 5 G millimeter wave (mm-wave) applications. Each patch element of the array is excited with same amplitude and phase that is achieved with proper novel impedance matching stub. The proposed antenna achieves a simulated gain of 13.15 dBi and a measured return loss of −24.80 dB at 28.73 GHz with a total bandwidth of 7.48 GHz. The designed antenna is directional with a directivity of 15.1 dBi at 28.73 GHz, whereas fabricated on a low cost FR4 substrate with a substrate thickness of 0.074 λ mm. The antenna is realized with an aperture size of 2.24λ × 3.26λ. Design/methodology/approach The antenna structure starts from the design of single element called unit cell. The single element is designed using the transmission line model equations of a rectangular patch. To design a 28 GHz microstrip patch antenna, a dielectric material with lower permittivity and having thickness (h) less than 1 mm is required. This specification gives better gain and efficiency by reducing surface waves and mutual coupling between elements. The inset width is optimized to achieve the minimum reflection coefficient (S11). The single element has been arranged with a minimum spacing of λ/2 (5.3571 mm) in an H plane and E plane. It is connected using the microstrip lines with proper impedance matching. The four 2 × 2-sub array cell subsystems are connected with a corporate feed together formed the 4 × 4-array cell. Rectangular planar array method is used to arrange the elements in the 4 × 4 array cell. Findings The design concept is simple which includes the combination of corporate feed and insect feed. It is compact in size and easy to fabricate. The bandwidth of fabricated prototype antenna array is achieved as 7.48 GHz from 24.98 GHz to 32.46 GHz. The mutual coupling is very less though the antenna array is placed with minimum spacing between adjacent elements. This is because of the microstrip feeding structure with minimum phase shift. The gain can be further enhanced with increasing number of array element and proper designing of feed line. Owing to the advantages of low profile, wide bandwidth and high gain, the designed array will be potentially useful in 5 G wireless communications. Originality/value The measured antenna offers bandwidth 7.48 GHz (24.98 GHz-32.46 GHz) with centered frequency 28.73 GHz. The agreement between simulated and measured results is good. The VSWR is observed 0.32 < 2, offers good impedance matching and low mutual coupling. It gives better E-Field and H-field radiation patterns of the 4 × 4 array antenna structure at 28 GHz. The total gain of 13.14 dBi is achieved at the center frequency. The total efficiency of 63.42 per cent is achieved with FR4 substrate.

scholarly journals Impedance Enhancement of Textile Grounded Loop Antenna Using High-Impedance Surface (HIS) for Healthcare Applications

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3809
Author(s):  
Mohammed M. Bait-Suwailam ◽  
Isidoro I. Labiano ◽  
Akram Alomainy
Keyword(s):  
Impedance Matching ◽  
Loop Antenna ◽  
Healthcare Applications ◽  
Impédance Surface ◽  
Antenna Structure ◽  
Impedance Surface ◽  
High Impedance ◽  
Low Profile ◽  
Close Proximity ◽  
High Impedance Surface

In this paper, impedance matching enhancement of a grounded wearable low-profile loop antenna is investigated using a high-impedance surface (HIS) structure. The wearable loop antenna along with the HIS structure is maintained low-profile, making it a suitable candidate for healthcare applications. The paper starts with investigating, both numerically and experimentally, the effects of several textile parameters on the performance of the wearable loop antenna. The application of impedance enhancement of wearable grounded loop antenna with HIS structure is then demonstrated. Numerical full-wave simulations are presented and validated with measured results. Unlike the grounded wearable loop antenna alone with its degraded performance, the wearable loop antenna with HIS structure showed better matching performance improvement at the 2.45 GHz-band. The computed overall far-field properties of the wearable loop antenna with HIS structure shows good performance, with a maximum gain of 6.19 dBi. The effects of bending the wearable loop antenna structure with and without HIS structure as well as when in close proximity to a modeled human arm are also investigated, where good performance was achieved for the case of the wearable antenna with the HIS structure.

Analysis and design methods of planar array antennas with slotted waveguides taking into account mutual coupling

1989 ◽  
Vol 72 (10) ◽  
pp. 103-110 ◽  
Author(s):  
Yoshihiko Konishi ◽  
Hitoshi Mizutamari ◽  
Shin-Ichi Sato ◽  
Seiji Mano ◽  
Takashi Katagi
Keyword(s):  
Mutual Coupling ◽  
Design Methods ◽  
Analysis And Design ◽  
Array Antennas ◽  
Planar Array
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