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This paper presents a hierarchical MCU (micro-control unit) architecture to reduce the number of wires required to control the RF devices of large phased array of antennas. In addition to cost reduction, the decrease of control wires may also reduce the electromagnetic interferences to the antenna radiation that are caused by the presence of wires. In particular, Genetic algorithm (GA) was also implemented...
In this paper, an ultra-compact Ultra-wideband (UWB) bandpass filter (BPF) based on modified multimode resonator (MMR) is proposed. The compactness of the proposed UWB BPF with good impedance matching in passband is achieved using modified MMR, which consists of meandered coupled lines, stepped-impedance stubs, open-circuited stubs and coupled-line sections. Stepped-impedance stubs which are used...
Synthetic aperture radar (SAR) is known to all weather usable radar system. It can divide linear polarimetric SAR (LP-SAR) and circular polarimetric SAR (CP-SAR). However, CP-SAR has been proven to less effect of the Faraday rotation in the ionosphere. On the other hand, in spite of polarization, full polarimetric SAR (FP-SAR) has some drawbacks of limited swash width, an increase of system complexity,...
This paper presents the performance evaluation of multi-user MIMO (MU-MIMO) employing Tomlinson Harashima precoding (THP) in consideration of user scheduling techniques from the viewpoint of system capacity and fairness. In this paper, the ordering process is adopted for THP, and both semiorthogonal user selection (SUS) and proportional fairness (PF) are considered as user scheduling techniques. Their...
This paper proposes small CRPA arrays with high-dielectric ceramic superstrates for dual-band operation. Each array element consists of inner and outer microstrip rings printed on a high-dielectric substrate, and a hybrid chip coupler is used for quadrature excitation to achieve circular polarization. The superstrates with high relative permittivity are designed to have a cylindrical shape and are...
An array of microstrip lines is used for the direct excitation of the spatially distributed TE10 substrate integrated waveguide (SIW) mode. The proposed configuration can generate 4x more power with a 4x smaller form factor relative to a single microstrip-to-SIW transition, while offering a larger bandwidth. This is an important step toward the generation of high power in densely integrated mm-wave...
This paper presents a design of the universal reader antenna applied for the radio frequency identification (RFID) system with the operating frequency from 840 MHz to 960 MHz. The antenna structure consists of a rectangular loop and a rectangular feeding patch which are the important elements to produce the circular polarization. The total size of the reader antenna is 120 mm ×120 mm fabricated on...
For the future fifth generation (5G) communication systems, one of the promising techniques is the massive multiple-input multiple-output (MIMO), which applies hundreds of antenna elements for antenna design. However, how to evaluate a good structure of two-dimensional (2D) antenna array for a specific channel environment in designing massive MIMO systems is still under research. In this paper, we...
In this study, to examine the impact of distance, and angle on the human head during the regular functioning of a mobile phone, a head model is constructed via COMSOL software dataset. The handset antenna has been configured with a patch antenna being a radiation source at 900 MHz, 1800 MHz and 2100MHz, respectively. Temperature increase and specific absorption rate distribution on the user's head...
We have proposed an open terminated folded inverted-L antenna (FILA) with slits. In order to miniaturize the FILA, several slits are employed on the substrate surface. Folded structure is used for broadbanding. Design of the FILA to achieve broadband characteristics is shown. Simulation and measurement are implemented, and comparison of the results are evaluated. Finally, we calculate the product...
This paper proposes a new planar rectenna which provides dual-axis wide-angle reception. An in-phase/anti-phase triple-feed array antenna is employed to obtain high gain but prevent gain degradation due to main-beam misalignment. The proposed rectenna separately rectifies the in-phase and anti-phase components of the received RF waves in a simple structure by effectively using two types of magic-Ts...
A substrate integrated magneto-electric (ME) dipole antenna with metasurface is proposed for the 5G/WiMAX/WLAN/X-Band MIMO applications. In order to provide the low profile characteristic, the radiated electric dipoles and the shorted wall are integrated in the multi-layer substrates at different altitudes. Unlike the conventional metasurface antenna, by introducing the ME dipole structure with modified...
A graphene reflectarray is designed to realize two functions simultaneously at terahertz frequency: generating vortex waves, and steering the waves. Four parts of graphene patches with different values of reflection phase are used to generate vortex waves. On the other hand, generalized Snell's Law is applied to introduce additional reflection phase. Anomalous reflection is realized to steer the Vortex...
This paper presents for the first time an innovative 3D printed SoP sensor node with temperature, pressure and humidity sensing capabilities. It has an integrated wireless readout through a near isotropic (900MHz) GSM antenna-on-package. This sensor node is connected to the internet for remote monitoring and has the capability of localization. The paper presents the design of antenna-on-package as...
In this paper, the size of a log-periodic dipole array antenna is reduced using partially applied folded planar helix dipole elements. The proposed antenna shows almost no gain deterioration in the entire operating bandwidth even though its size is reduced by 39 %. Due to its reduced size and lightweight characteristics, it is expected that the proposed antenna could be effectively utilized in the...
In this paper, we review how to design geometrical asymmetry for enhancement of phase-shifting nonreciprocity and for optimizing its dispersion in composite right/left handed transmission lines for antenna applications.
Recently, applying the multimedia wireless sensor networks and computer vision techniques in the outdoor agriculture field can be observed. Since the performance of such techniques is limited by the low data rate of the wireless sensor network, the transmission using the wider bandwidth is one of the possible solutions. This paper proposes the technique to develop the wide-band channel sounder for...
We report the intermediate results on a novel slotted waveguide antenna for point-to-point communications at Ka band. The antenna adopts an aperiodic layout with uniformly-excited elements capable of meeting the ETSI class II radiation pattern envelop in all planes with high aperture efficiency. A total of 16 regular waveguide subarrays with an aperiodic inter-column spacing along the E-plane are...
This paper present the microstrip patch antenna with I-shaped mushroom like EBG structure for gain enhancement. By properly placing the electromagnetic band gap (EBG) structure around radiating patch, the gain of a conventional microstrip patch antenna is improved. In order to achieve the EBG operation for wireless local area network of U-NII 1 and 2 bands, the EBG structure is formed by using the...
Now a day's increasing demand for higher bandwidth and other benefits of millimeter waves like line of sight communication and non bending property, molecular absorption, higher antenna gain at high frequencies make millimeter wave component design a favorite area of working. This transition structure of waveguide to microstrip line is useful for integration of high frequency circuits to the waveguide...
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