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A low‐profile antenna with an antenna gain of 6.80 dBi at 8.40 GHz is presented. This antenna radiates vertical polarization with a unidirectional beam pattern in the horizontal plane which is parallel to the ground plane. Furthermore, a monopole array antenna model is used for verification of the antenna mechanism.
A low-profile and decoupling dipole antenna array is achieved by combining patch type meta-surface with proposed parasitic cells. Based on the moment method analysis results, it is clarified that proposed parasitic cells can suppress mutual coupling of dipole antennas without additional impedance. In addition, the maximum decoupling effect of 13.3 dB is achieved.
This paper proposes the horizontally polarized omni-directional antenna with a cylindrical frequency selective surface (FSS). The FSS features the orthogonal polarization conversion function. Therefore, the vertically polarized wave radiated from a dipole antenna is converted to the horizontally polarized transmitted one. The simulation results by using the FDTD and the MoM show that this antenna...
This paper proposes the spatial filter with FSS(Frequency Selective Surface) for orthogonal polarization conversion such as converting the vertical polarization to horizontal polarization. It is found that multilayered loop-slot type FSS having band-pass filter characteristics realize orthogonal polarization conversion. Furthermore, it is shown that the optimal number of layers of the FSS is three,...
This paper describes a configuration of meta-surface with frequency selective surface (FSS) for wideband polarization conversion. Requirements of the FSS for realizing wideband polarization conversion function are clarified. To satisfy the requirements, a configuration of meta-surface by using low-pass and band-rejection spatial filter is proposed. As the result, about 50% of relative bandwidth of...
This paper proposes the variable reflection angle meta-surface composed of the double layered FSS (Frequency Selective Surface) and the ground. The meta-surface can steer the reflection direction of the incident wave by shifting the lower FSS. It is clarified that the gradient of the reflection phase in the reflection direction steering plane (x-z plane) are changed by the shift amount of lower FSS...
This paper proposes a variable reflection angle meta-surface using double layered FSS (Frequency Selective Surface) for orthogonally polarized waves which can change the scattering pattern easily by shifting one layer. The reflection angle within range of about −20 deg. to −5 deg. is obtained in case of orthogonally polarized waves.
A meta-surface can reflect the incident wave with arbitrary reflection coefficient. This paper proposes a novel meta-surface which has polarization conversion function. A linearly polarized (LP) incident wave can be converted to a circularly polarized (CP) reflected wave by using a rectangular patches and the ground plane. In addition, the relationship between the frequency bandwidth and the structure...
This paper focuses on an AMC (Artificial Magnetic Conductor) composed of a FSS (Frequency Selective Surface) and the ground plane, and describes the ideal filtering characteristics for realizing PMC (Perfect Magnetic Conductor) which is independent of frequency. The ideal filtering characteristics is derived from the condition for realizing the PMC in all the frequency using the relational expression...
This paper proposes the variable reflection angle meta-surface using the double layered structure which can change the scatter pattern simply by sifting other layer. It is clarified that the gradients of the element vs. the reflection phase are changed by the relative position between two layers in double layered patch type FSS (Frequency Selective Surface). It is found that the reflection angle with...
This paper describes the filtering characteristics of the alternated double layer patch type FSS (Frequency Selective Surface) in which a patch type FSS is arranged alternately at the surface and the back of a dielectric substrate. The equivalent circuit and the empirical equation of the coupling coefficient including dielectric substrate effect are proposed. It is also shown that the approximate...
This paper describes the equivalent circuit analysis of a double layer AMC (Artificial Magnetic Conductor) in consideration of mutual coupling between layers. The AMC with double layer patch type FSS (Frequency Selective Surface) is focused. This paper treats two type double layer structures. The one is stacked structure, and the other is alternated structure. It was shown that the calculated results...
This paper describes the possibility of the miniaturized AMC (Artificial Magnetic Conductor) by the equivalent circuit analysis. The AMC with double layer patch type FSS (Frequency selective surface) is focused as the structure of AMC. It is clarified by the theoretical results that the operation frequency of the FSS becomes the half by using double layer patch type FSS. It is also shown that unit...
This paper describes unit cell structure of AMC (Artificial Magnetic Conductor) with a multi-layer FSS for miniaturization. Two types of unit cell, “Patch type” and “Grid type” unit cell are treated. Moreover, two types of FSS collocation method for multi-layer structure, “Stacked structure” and “Alternated structure” are considered. As the results of analysis, it is shown that the miniaturization...
This paper describes the PMC (Perfect Magnetic Conductor) and EBG (Electromagnetic Band Gap) characteristics of a cross type artificial magnetic conductor. It is clarified that the PMC characteristics appears at higher frequency than the EBG characteristics and the frequency difference between two characteristics becomes large as the cross type AMC becomes thin. It is also shown that the EBG characteristics...
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