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A coupling reduction method is proposed by using stacked electromagnetic band gap (EBG) structure for a two-element antenna array. The stacked EBG is a periodic multilevel layered electromagnetic band gap structures (PML-EBG). The PML-EBG is set in the middle of two identical patch antennas with distance of 0.13λ. The proposed antenna operates at 2.55GHz. A good isolation is achieved by the use of...
The design of integrated FM broadcast reception antennas for automotive applications is a particularly challenging task since the operational wavelength is of the order of geometrical dimensions of the vehicle. This causes standing wave effects and adversely affects the resulting radiation pattern. On the other hand, the increasing number of car platforms and decreasing time-to-market cycles necessitate...
The problem of reducing the side-lobe level of the radiation pattern of the trough waveguide antenna has been considered. To solve this problem, weighting the height of the elements of excitation has been used. For increasing the efficiency of the weighting, it is proposed to use a weight function that takes into account the losses of the exciting wave as it passes through the elements of the exciting...
A self-interference cancellation (SIC) antenna pair for full duplex communication is proposed. It consists of two aperture-coupled patch antennas with orthogonal linear polarizations and an auxiliary port loaded with a proper reflective termination. The auxiliary port introduces an indirect coupling path and the coupling signal is reflected to RX port and superposed with the direct coupling to make...
Millimeter-wave (mm-Wave) Massive Multiple Input Multiple Output (MIMO) at 60 GHz is a candidate of advanced wireless communications for indoor environment. Mm-Wave massive MIMO antenna with lower frequency with sectoring technique has been proposed in previous research. Also dual polarized configuration for MIMO in lower frequency and lower number of antenna. Massive MIMO at 60 GHz mm-Wave is not...
This paper presents the use of ElectroMagnetic (EM) simulation in RadioFrequency Interference (RFI) area. First, we describe a methodology to treat front door interference problems on large platforms. Based on a concrete example, we show that using EM simulation enables one to facilitate risk assessment, optimize antenna placement and understand complex physical phenomena. In the second section, radiating...
A novel method allowing for reduction of coupling between vertically placed radiating elements in antenna arrays has been proposed. It has been shown, that appropriate offsetting the antenna array elements from the array symmetry axis allows to improve isolation between adjacent elements, which results in improvement of the obtained radiation pattern. The theoretical investigation has been performed...
In designing a microstrip phased array (MSA-array) shown in Fig.1, it is important to estimate the influence of mutual coupling between microstrip antennas(MSA)(1). In this paper, we investigate the effect of mutual coupling on the radiation pattern of the antenna. After calculating the coupling, the experimental patterns are compared to the calculated ones. From these results, it is shown that the...
This article details about the method of controlling Side-Lobe-Level (SLL) in the radiation pattern of mutually coupled symmetrical linear dipole antenna array in a proper direction. There are several conventional numerical and analytical methods to compensate the effect of mutual coupling, but to get better performance on linear dipole antenna arrays, an effective optimization technique is implemented;...
A low profile unidirectional UWB antenna for multi-service base stations is presented in this paper. The main goal of this article is to design a low profile UWB antenna with a very stable and unidirectional radiation pattern. The proposed design is based on exciting the fundamental mode of a planar structure composed of two metallic rings, applying the Theory of Characteristics Modes. The feeding...
A pattern control for portable devices at 2.45 GHz is proposed by exploiting phase-shifted characteristic modes (CMs). Among all available orthogonal CMs, the pattern control of a rectangular conductive plane has been obtained by a weighted linear superposition of only two current modes (J4 and J8). A proper position of two capacitive coupling exciters (CCEs), hosted above the rectangular conductive...
An effective technique for reducing the mutual coupling between mm-wave dielectric resonator antennas (DRA) using a novel metasurface is investigated and presented. This is achieved by embedding a metasurface wall between the two DRAs, which are placed in H-Plane. Using the proposed metasurface, the TE modes of the antenna become orthogonal which reduces the mutual coupling between the two DRAs. The...
In this paper, we report the results of a preliminary study of the design of dual-band platform-mounted antennas. In this approach, appropriately-designed coupling elements are employed to excite a desired platform mode to obtain an operating band in the HF frequency range. Moreover, the coupling elements are also designed to act as ultra-wideband radiators within the VHF frequency band. The coupling...
The inter-element distance in superdirective arrays is usually very small and hence the mutual coupling is considerably high. Consequently, these arrays present relatively low efficiencies. In this paper, we propose using decoupling techniques for reducing the mutual coupling, and hence increasing the efficiency, in this kind of arrays. The concept is proven by full wave simulations of two different...
This paper illustrates the use of Characteristic Mode Analysis in FEKO to synthesize a desired combined antenna pattern of multiple antennas mounted on an aircraft, and to mitigate co-site interference between antennas on an aircraft.
This paper presents the design and accurate simulation of two small and medium-sized antenna arrays working in Ka-band (20 GHz). Feeding networks and radiating panels are studied separately and two methods for extracting the scattering matrices of the radiating panels are presented and compared. These developments are an important step of the further modelling of larger arrays.
Compact and low-profile VHF antennas with enhanced bandwidth have a wide spectrum of applications in both commercial and military communication systems. Having both of these criteria in a single antenna, however, is very challenging. In this paper, we demonstrate a method for bandwidth enhancement of vehicle-mounted electrically-small antennas operating in the VHF band. In this method, the vehicle...
We present a methodology to design cavity-excited omega-bianisotropic metasurface (O-BMS) antennas capable of producing arbitrary radiation patterns, prescribed by antenna array theory. The method relies on previous work, in which we proved that utilizing the three O-BMS degrees of freedom, namely, electric and magnetic polarizabilities, and magnetoelectric coupling, any field transformation that...
It is known that a loop antenna of one wavelength circumference radiates a linearly polarized wave in the direction normal to the antenna plane. It is also known that, when perturbation elements are added to the loop, the linearly polarized wave can be changed to a circularly polarized wave [1]. For mobile communications, the circularly polarized wave at low elevation angles is often required to have...
Stacked patches have many performances [1] that make them the most appropriate option for many applications due to their wide band and easy manufacturing. However they are not many systematicways to design such antennas. This work presents a new radiation model for such antennas. The model is based on the two-slot radiation model for simple patches, and consists of a four or six element array depending...
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