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In this article, a super compact enhanced-bandwidth (EB) rat-race coupler (RRC) is initially proposed based on the combined technology of fractal geometry and lumped-element composite right/left handed transmission line (CRLH TL). The close-form broadband derivation and a set of design guideline for fractal implementation are provided which should be a reference value for future design. Fractal perturbation...
A microwave gradient meta-surface is designed and fabricated. The structure is consist of a stack of two-dimensional (x-axis and y-axis) arrays of gradually-varied sub-wavelength elliptical rings, a dielectric substrate and a metallic ground plane. Both theoretical and experimental studies are conducted to demonstrate that the carefully designed y-axis phase gradient meta-surface supports high-efficiency...
A novel dual-band EBG-based Multiple-input multiple-output (MIMO) antenna system with high isolation performance for wireless local area network (WLAN) applications is proposed. The MIMO antenna comprises of two broadband printed slot antennas fed by a coplanar waveguide (CPW) feed line. When the antennas are placed at closer spacing, mutual coupling comes into existence deteriorating the performance...
A novel slot antenna with a thin metasurface (MS) ground is proposed. The MS provides reflection energy cancellation and enlarge radiating aperture simultaneously. Measured results indicate that a 6 dB RCS reduction is realized within the antenna operating band, and the gain increases compared to the reference antenna with metallic ground.
The microstrip wideband antenna has attracted much attention due to the applications of multiple wireless communication systems, such as the global positing system (GPS at 1.575 GHz), the digital communication system (DCS at 1.8 GHz), the international mobile telecommunications-2000 (IMT-2000 at 2.1 GHz), the wireless local area network (WLAN at 2.45 GHz), the long term evolution-2600 (LTE2600 at...
We propose a reflective linear polarization converter with broadband and high-efficiency using ladder-shaped resonator (LSR) structure metamaterial (MM) based on multi-reflection interference theory. Three resonances generated by LSRs contribute to the expansion of working frequency range while the interference theory is employed to explain the characteristic of high-efficiency polarization conversion...
The design and realization of a low-profile wideband dual-polarized patch antenna with high isolation and low cross polarization has been presented. The aperture-coupled antenna element has four layers of substrates. Two microstrip lines terminated with circular patches are printed on the backside of the bottom substrate for feeding the radiating patches, while on the other side is a ground plane...
The article concerns problems of electromagnetic compatibility and compromising emission that is the information security. The article focuses on USB 3.0 Interface for which shows signals of extortion used during of compromising emission measurements. The article presents the results of compromising emissions measurements derived from USB 3.0 Interface. In addition, the article discusses the laboratory...
This manuscript represents the two half circular gap coupled disk patch antenna stacked with D.G.S. (Defected Ground Structure) for dual-wideband application. The antenna has an overall size of 40.0×40.0×1.6mm3 and gives the results of dual band performance. The proposed antenna can be used in military communication, wideband global satellite communication systems (WGS) (9.43–10.08 GHz) and in Airport...
The Smart antenna for Broadband Wireless Access used beamforming method by focusing the direction of the antenna beam to some desired targets. This paper discusses beamforming control system to control the direction of the antenna beams electronically by using 16MHz Arduino platform-based microcontroller algorithm. The microcontroller was programmed to control the switching network that connects to...
The paper presents a wideband omni-directional horizontally polarized (HP) antenna utilizing four modified T-bar fed cavity-backed slot antenna (CBSA) elements. The wide bandwidth of the antenna is guaranteed by the wideband CBSA elements. The proposed antenna achieves a 76% (443MHz ∼ 992 MHz) bandwidth for VSWR ≤ 2. The antenna size is 260mm × 260mm × 420 mm, which is 0.38λL × 0.38λL × 0.62λL (λL...
The generation of continuous THz-waves by photomixing has several promising features, such as extremely-wide frequency tunability, very narrow linewidth, good frequency stability, and the ability to transmit high-frequency signals through low-loss optical fibers. To make such a scheme work effectively, we developed an InP/InGaAs uni-traveling-carrier photodiode (UTC-PD) [1, 2]. The UTC-PD has a unique...
A broadband aperture-coupled stacked patch array with a 45° polarization is presented. With the stacked patches and air layer structure being used, the elements' bandwidth and radiation efficiency are improved. The array achieves the 45°-polarization radiation through rotating the patches of each element. Experimental results show that a sound impedance match and stable radiation patterns are achieved...
A broadband implementation of the multilevel fast multipole algorithm is developed and employed to solve multiscale problems involving large objects with small details and discretizations. Despite its limited accuracy, the proposed scaled diagonalization enables stable computations of electromagnetic interactions at arbitrary short distances with respect to wavelength. The effectiveness of the developed...
In this paper, a wideband Fabry-Perot resonator antenna is proposed. The Fabry-Perot cavity with maximum profile about half-wavelength consists of a parabolic-shape ground plate, a metallic grating-shape FSS acted as cover. The primary feeder embedded in cavity is composed of an open-ended waveguide. Taking use of parabolic-shape reflector the performance of bandwidth for gain can be improved obviously...
Plane reflector is a two dimensional array which consists of apertures or patchesthis kind of reflectarray is always illuminated by a primary feed hornand then compensate the spatial phase delay by the elements printed on the surface. The main advantage of this structure is the main beam can be designed to tilt or scan a number of beamwidths away from its broadside direction. But the most significant...
A novel Quasi-Yagi antenna was proposed with ultra-wideband and miniaturization characteristics. The butterfly dipoles and parasitic branches are adopting to improve the bandwidth of the Quasi-Yagi antenna. Affections of antenna structure parameters on antenna was analyzed in this paper. After optimization, the operating frequency ranges from 3.3 to 10.2 GHz. Meanwhile, gain is more than 5.1 dB, and...
In this paper, a novel X-band broadband single-layer unit cell with attached phase-delay lines for reflectarray antennas is proposed to surmount the limitation of the reflectarray bandwidth. The unit cell is composed of three circular rings, each with a pair of gaps which are mutually placed orthogonally, and two identical circular phase-delay lines are attached to the outer ring to provide the required...
A broadband center-fed reflectarray antenna is presented in this paper. Patch with slot ring on ground plane elements are used for bandwidth improvement. It is shown that quasi-linear phase responses with broad frequency band can be achieved by such a phasing element. An 11×11 elements reflectarray is designed and simulated. The results show that the simulated gain is 23.92 dB at the center frequency...
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