Smart antenna arrays with adaptive nulling capability are emerging as a promising solution to suppress the interference in radar applications and wireless communications in real time. Many adaptive nulling methods have been commonly used, such as ...

This paper presents a design flowchart, design equations, and design of a D-band Rotman lens beam-steering microstrip array antenna at 110–145 GHz operating frequency. The initial design of the Rotman lens was done by Remcom Rotman lens designer (...

A tree-shaped graphene-based microstrip multiple-input and multiple-output (MIMO) antenna for terahertz applications is proposed. The proposed MIMO antenna is designed on a 600 × 300 μm² polyimide substrate. The designed MIMO antenna provides a ...

A frequency-selective surface (FSS) is able to transmit or reflect incoming electromagnetic waves, and these properties of FSS can be utilized in printed antennas to improve the performance of these antennas. Sub-6 GHz frequency bands are used in ...$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$

Today, the design of antenna arrays is very important in providing effective and efficient wireless communication. The purpose of antenna array synthesis is to obtain a radiation pattern with a low side lobe level (SLL) at a desired half power ...

One of the recent challenges that arise in the study of small antennas is the bio-electromagnetic analysis of implantable and wearable devices for e-health applications. In this paper, a new on-body scenario for safely limits is discussed. An ...${}^{\mathrm{}}$

In this study, we propose a miniature triple band PIFA antenna (planar inverted-F antenna) composed of uniform semi-patches for LTE2600/WLAN/WIMAX/HIPERLAN-2 applications. The binary genetic algorithm determines the shape of the antenna’s ...${}_{\mathrm{}}\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}\mathrm{}{\mathrm{}}^{\mathrm{}}$

The purpose of this research is to improve terahertz photoconductive antenna arrays to enhance their output power. The improved arrays were designed based on crossfingers structure as a high power terahertz generator. The finite difference time ...

In recent years, communications-based applications have become increasingly important, depending principally on the design, architecture, and performance of the antenna. The design for an antenna for use in a proposed system must consider its ...

A circularly polarized semicylindrical patch antenna loaded with unequal slots for use in S-band applications is presented and designed. Circular polarization operation is demonstrated for both planar and semicylindrical structures by embedding ...

The design and optimization of an antipodal Vivaldi antenna using graphene material for ultra-wideband applications are described. A frequency-reconfigurable graphene antipodal Vivaldi antenna operating in the terahertz band is designed on a ...

In this work, we study the radiation characteristics of a graphene patch antenna in the terahertz band. Antenna performance is maximized by varying specific sub-components. The first variation is the addition of graphene nanoribbons (armchair and ...$\mathrm{}$$\mathrm{}$$\mathrm{}$

An attempt is made to improve the impedance bandwidth (S₁₁) of a microstrip antenna by means of the gap-coupling method, yielding a bandwidth of 97.88% for the gap-coupled rectangular microstrip antenna (GC-RMSA) compared with 7.67% for the direct-...

A circularly polarized wearable textile antenna for use in WLAN (5.15–5.825 GHz), HIPER LAN/2 (5.15–5.350 GHz, 5.470–5.725 GHz) and C-band applications is presented. The wearable antenna was formed on jeans fabric (as substrate) and is simple in ...

Generally, the phased antennas used in radar and communication systems have a certain taper to minimize the side-lobes. However, most tapering methods are inefficient for practical applications because they generally reduce the overall efficiency of the ...

This paper presents a low-profile, isolation-enhanced, multiple-input multiple-output (MIMO) antenna with a band-notch feature. The MIMO structure comprises two fractal-shaped slotted radiating elements along with a defected ground structure. ...

A semicircular radially gradient metasurface (SCRGM) structure is proposed to modulate the phase of the electric field of a radiofrequency (RF) antenna in the near field. The metasurface partially covers the antenna aperture, thus facilitating tilting ...

This paper presents a circularly polarized wideband magnetoelectric dipole antenna with a defective semicircular patch for C-band applications (4---8 GHz). In the proposed design, in order to get proper impedance matching and stable gain, a pair of ...

A theoretical investigation is carried out using the perturbation method to calculate the resonant frequency of a horizontally and vertically perturbed rectangular dielectric resonator antenna (RDRA). The accuracy of the proposed method is validated ...

A T-shape patch antenna loaded with a rectangular slot and fed directly by a 50-Ω microstrip line was optimized using the IE3D simulation tool to improve its bandwidth at a frequency of 2.45 GHz by varying each of four parameters while keeping the other ...