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In this paper, a modulated metasurface structure is introduced for reducing the interference between two dipole antennas placed close to each other in MIMO application. For a system comprising of two dipole antennas of WLAN frequency of 2.4GHz and 6.3GHz respectively, a single metasurface cloak structure covering the 2.4GHz antenna provides proper...
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... of two dipole TM polarized antennas is considered for analysis. Electrically small antennas I and II with radius a= λ 0 /14 are working in the frequency of 2.4GHz and 6.3GHz respectively. The antennas are designed using CST Microwave Studio Suite. When these two conducting cylindrical antennas are placed at a distance of λ 0 /4 apart as shown in Fig. 1, Antenna II has greater frequency shift due to the interference of electrically long close spaced Antenna I. But Antenna I have negligible frequency shift. To overcome this interference, Antenna I need to cloak the Antenna I. To Provide accuracy, high aspect ratio as radius a c =1.25a is chosen [22] with dielectric constant as ε c =10 ...
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This paper presents a two-element MIMO antenna configuration designed using magneto-dielectric (MD) material. The MD material has been designed such that its temperature coefficient value approaches zero. The microwave dielectric constant and permeability of the material is calculated by Nicholson-Ross-Weir conversion technique and found to be 8.02...
Citations
... 9,10 The mantle cloaking was also reported for its suitability in reducing the coupling interference between antennas. [11][12][13] Recently, the cloaking structure with microwave network comprising of interconnected metallic patches was applied for cloaking the larger sized object. It can be considered as one of the possible solution to cloak the bulk objects with a thin cloaking material. ...
In this research article, a triangular-shaped microwave network cloak made out of interconnected patches was designed at the frequency of 2.88 GHz. Its performances in terms of field distributions and radar cross section scattering were compared with the existing structures. The novel triangular-shaped cloak structure was then applied to cloak a hindering obstacle placed in front of an electromagnetic source. The simulated scattering parameter and radiation pattern of antenna source were then validated through the experimental results. Also, the proposed structure was applied to reduce the mutual interference between two neighboring antennas. The effects of various parameters such as position and size of the cloak, dielectric constant, and substrate thickness on the cloaking effect were also simulated and studied.
... This can be achieved by cancelling or minimizing the scattering properties of an object. Some of the theories that are adopted in this technology are transformation optics [1,2], transmission line network [3][4][5][6][7], microwave network [8][9][10][11] and scattering cancellation [14][15][16][17][18][19][20][21][22]. Many theoretical and experimental results are being carried out in the radio frequencies of the electromagnetic spectrum. ...
... Figure 7 (b) shows the structure for the modulated meta-surface in patch configurations. By this aperiodicity, an improvement of 15% in bandwidth was achieved as shown in Fig. 8 [22]. ...
... S Parameter result for modulated patch and horizontal meta-surface cloak in antenna application[22]. ...
This paper reviews the background phenomenon of various cloaking techniques such as transformation optics, transmission line network, microwave network cloak, scattering cancellation techniques in the applications of antenna field particularly in hiding the obstacle from the electromagnetic source and reducing the mutual coupling between two antennas that was placed closed to each other. Cloaking at multiple frequencies in each cloaking techniques are also compared. The comparative study showed that the scattering cancellation technique based on aperiodic Frequency Selective Surfaces (FSS) structure will dominate the electromagnetic cloaking field in near future.
A single layer of modulated meta-surface is proposed for cloaking the conducting object (satisfying the quasi static condition) at two frequencies. In order to study the cloaking behavior in practical scenario, the cloaking effect of modulated meta-surface is verified using dipole antenna. The modulated meta-surface structure designed using CST microwave studio suite can cloak the conducting object from two different frequencies of 4 and 5 GHz. The simulated result of the S parameter and radiation patterns verifies the cloaking effect at these dual frequencies. Though S parameter verifies the cloaking effect at dual frequencies, results of radiation pattern of dipole antenna clearly differentiate the cloaking phenomenon with that of the resonating behavior of cloaked structures.
