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A compact monopolar patch antenna is presented in this paper. The antenna has a wide bandwidth and a monopole-like radiation pattern. To reduce the whole size of the antenna, a substrate with high dielectric constant is adopted. Besides, three types of shorting pins and a triangle slot are added to the patch to widen the impedance bandwidth. The proposed antenna operates from 2.29 to 2.59 GHz for...
In this paper, a novel single-layer broadband subwavelength multi-resonance element is proposed to design a dual circularly polarized (CP) reflectarray with a dual linearly polarized (LP) feed. The simulated results show an adequate phase range over 3600 and low mutual coupling between the two orthogonal polarizations of the element. Also, a superior bandwidth performance has been verified, compared...
In this paper, A multi-layered composite wideband absorbing material covering dual band is designed and fabricated. The upper layer is a traditional absorber while the lower one is a dual-frequency frequency selective surface (FSS) formed by a square ring and an improved Jerusalem cross structure. The absorbing band has been broadened significantly compared with those of the traditional absorber without...
This paper presents a switchable frequency selective surface (FSS) based on a modified Jerusalem-cross (JC) unit cell with extended top loading. Various combinations of switches are considered to make it switchable and the corresponding FSS behavior is analyzed. It is noted that the pass band(s) and stop band can be achieved by turning switches ON or OFF appropriately. For example, as a band pass...
A novel wideband Marchand balun and bow-tie antenna have been proposed for sensor application. The proposed balun has been designed to differentially fed bow-tie antenna and match its differential impedance. The proposed approach has been investigated and verified by electromagnetic calculations and measurements of an exemplary Marchand balun and bow-tie antenna operating at center frequency f0 =...
An antenna, composed of low-profile four arms, is investigated. The analysis shows that bending the arms makes the VSWR value small at low frequencies. It also shows that the meandering cells introduced to each arm contribute to a decrease in the lower band-edge frequency. Thus, the investigated antenna operates across a frequency region of 2.88 GHz to 50 GHz for a VSWR = 2 criterion. The radiation...
Three principles of designing base-station antennas are proposed: wide band impedance match, stable radiation patterns in wide frequency band and high cross polarization ratio in wide angle range.
Narrow bandwidth is a challenging problem for designing platform-mounted electrically small antennas in the high-frequency (HF) band. In this paper, we demonstrate a process that can be used to improve the bandwidth of a platform-mounted HF antenna or antennas by taking advantage of the presence of the platform. Specifically, we examine a simplified model for the Expeditionary Fighting Vehicle (EFV)...
A Fabry-Perot cavity antenna (FPCA) with a compact single-layer all-dielectric superstructure is designed using particle swarm optimization (PSO). The PSO algorithm, implemented in a MATLAB code, considers Ackley function to achieve stable convergence by adjusting its internal parameters. We performed single-objective optimization using an objective function that maximizes the sum of boresight directivities...
This paper presents a novel design of orientation distributed digital metasurface for suppressing backward radar cross section (RCS) with a broad working bandwidth. A corrugated meander line is proposed as the constitutive unit cell which is capable of creating 1-bit (with two orientations of 0° and 90°), 2-bit (with four orientations of 0°, 45°, 90° and 135°) and multi-bit elements by different orientations...
A miniature and broadband implantable antenna is designed for wireless biotelemetry in the medical implantable communications service (MICS) frequency band (402–405 MHz). To minimize antenna size and enhance bandwidth, a meandered planar inverted-F antenna (PIFA) structure is adopted on a dielectric/ferrite substrate. The potential of the proposed antenna is verified through a prototype fabrication...
A software-defined pattern reconfigurable Ka-band antenna for high-speed satellite-on-the-move (SOTM) application is presented. The proposed antenna employs the concept of travelling-wave slotted integrated waveguide to achieve a high-directivity radiation beam as needed for satellite communications. The substrate integrated waveguide (SIW) is employed as the antenna's main structure to lower the...
In this paper, a compact quasi-Yagi antenna with ultra-wideband balun filter is presented. The proposed balun filter is constructed with composite microstrip and slotline resonators. With the excited three resonant modes of slotline resonator and two additional resonant modes of microstrip lines, the balun filter with ultra-wideband response can be realized. Thus, with this proposed ultra-wideband...
A broadband beam steering continuous transverse stub planar array fed by the parabolic reflector of substrate integrated waveguide (SIW) is proposed in this paper. The beam steering function could be realized by mechanically moving the H-plane SIW horn straightly along the direction of the stub. A 16-element array is simulated to validate the design. The simulation results show that the relative bandwidth...
A circularly polarized antenna array for E-band application has been designed, fabricated and measured. The antenna array is fed using substrate integrated coaxial line (SICL) technology, which can be realized by low-cost PCB process in millimeter frequencies. The simulated and measured S11 is below ™10dB from 71GHz to 76 GHz. And the simulated and measured results show that both the gain of more...
This paper presents a design of a wideband 4-port antenna array being useful for MIMO applications. In the designed antenna array that operates over the frequency band of 7.25–10.25GHz, a leaf-shaped monopole and notch antennas are employed as the array elements. By using these orthogonal polarization elements, both low coupling level between adjacent array elements and miniaturization of the antenna...
Three dimensional (3D) antenna refers to an assembly of radiating element on one layer and feed line on another layer and was introduced to minimize the antenna design space. This configuration allows room to integrate more devices and thereby enhances the chip functionalities for an system on chip (SoC) radio frequency (RF) applications. The designed 3D antenna element is composed of vertical metal...
In this work, we discuss ways to mitigate several problem with Metamaterials (MTMs), and discuss strategies for artificially synthesizing dielectric materials that are broadband and low-loss and, hence, are useful for real-world antenna applications involving low-profile flat lenses and reflectarrays, for example.
In this paper, an attempt has been made to improve the gain of a wide-band antenna using two layers of frequency-selective surfaces. It is seen that using two layers it is possible to achieve flat transmission characteristics over a reasonable bandwidth. However with an actual antenna, the gain improvement has at present been achieved over only a small band. It is expected that with further optimization...
We present initial Over-The-Air (OTA) throughput measurements of an LTE device in a Volvo XC90 car with roof-mounted antennas. The measurements were performed in a semi-anechoic chamber and only in the horizontal plane. The throughput results are presented as a probability of detection (PoD) in 2D Random Line-Of-Sight (Random-LOS) with fixed polarization of the antenna at the base station side. Two...
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