The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the design of a planar, low-profile, high-gain, wide-gain-bandwidth metasurface antenna with a multiple feeding structure. The antenna structure consists of a 5×5 array of square patch metasurface and a planar feeding structure, both of which are patterned on a high-permittivity, electrically thin, GaAs substrate. The metasurface is etched on the top side of the substrate, while...
This paper presents a dipole antenna as a feed of extended hemispherical lens for 60 GHz applications. This structure employs lens structure for gain enhancement and a dipole antenna as a beam launcher. Electromagnetic simulations of the proposed structure, including optimization of the extended lens length, are performed by CST. Throughout this paper, the design process of the proposed 60 GHz antenna...
A new Ultra-Wideband Antenna with notched band performance for WiMAX is proposed. The antenna has an extended impedance bandwidth from 3 up to 12GHz (120%). The band-notched can be controlled by adjusting the length of the rectangle slot. In order to obtain Omni-directional wide bandwidth antenna with uniform radiation pattern, rounded corners ground plane with two L-shaped slots are utilized to the...
This paper proposes a high-gain mechanically reconfigurable antenna array based on a ring-shaped slotted-waveguide antenna for mm-wave applications. A full scanning range in the azimuthal plane is ensured by proper mechanically rotating a metallic jacket, which partially covers the array radiating structure. The technique provides a beamwidth of 37° in the azimuth plane and gain of 17.41 dBi at the...
This work reports the development of antennas and antenna arrays for the future 5G cellular networks, which have been realized at the Brazilian Institute of Telecommunications (Inatel) in the last four years. Diverse reconfigurable antenna types based on printed and milled structures have been designed, fabricated and proper characterized from microwaves to mm-waves, with the aim of fulfilling the...
Ku band shaped pattern fan beam high gain spaced-borne slotted waveguide array is optimized and analyzed. The total array is composed by 16 partitions. Half height waveguides are used to reduce the slotted waveguide array weight. The waveguide wall thickness, coupling among the slots, circle end slots and other factors are all taken into account during the design process. The total array is fastened...
Terahertz (THz) wave frequency region is part of the electromagnetic spectrum. This spectrum is located between 0.3 THz to 10 THz or between radio waves and optics. The THz frequency region has potentials in many different applications, such as imaging, spectroscopy, and wireless communication. However, some problems are still remaining and should be solved to develop THz technology system for an...
In this paper, a dual segment rectangular dielectric resonator antenna (RDRA) designed on an MgO-B2O3-SiO2-TiO2 (MBST) glass-ceramic LTCC substrate is described. The simulation results for the RDRA on MBST substrate is compared with those for RDRA on FR4 substrate. Another section of the simulation study includes the effect of composite substrates i.e. FR4-air (FR4C) and MBST-air (MBSTC) substrates...
This proposed paper, a single band microstrip patch antenna for 5G wireless application is presented. This proposed antenna is suitable for the millimeter wave frequency. The single band antenna consist of new H slot and E slot loaded on the radiating patch with the 50 ohms microstrip line feeding used. This single band antenna is simulated on a Rogers RT5880 dielectric substrate have relative permittivity...
Bandwidth enhancement of an ultra-wide band swastika slot loaded antenna with band notch characteristic is presented. The antenna consists of an exciting rectangular patch on the front side and a partial ground plane on the backside of the substrate. A swastika shape is etched on patch, by inserting corner slots to the swastika shape, notched frequency band is improved. The simulated impedance is...
A compact strip-loaded slot antenna fed by microstrip line with double feeding strip and double blended stub is present. With the use of proposed feeding, the rectangular slot antenna achieves a very wide impedance bandwidth of 167%, which can operate in frequencies lower than 960 MHz for ground penetrating radar (GPR) applications. In addition, the two curved strips are used for changing the behavior...
Ray tracing is a useful tool to model the spatial and temporal propagation parameters of electromagnetic radiation. The model can normally improve by the channel sounding. However, discrepancies may arise between the channel sounding and ray-tracing model due to it needs a wide bandwidth to differentiate the incoming signals, also the antenna radiation pattern may change dramatically over this wide...
This paper presents simulation results of a dual-polarized 2×2 element sub-array antenna element at 15 GHz center frequency. The basic idea is to use two waveguides stacked on in a right-angle configuration to excite the orthogonal polarizations by using radiating slots. Above the slots, 4 parasitic patches are set to a form of 2×2 element sub-array. Antenna presents −10 dB impedance bandwidth from...
A design concept for a wearable device is proposed. The coplanar waveguide is ground-connected to short the bottom ground. The proposed antenna was fabricated on 0.4-mm-thick 20 mm × 15 mm FR4 substrate, and exhibited a bandwidth of 300 MHz (2.33–2.63 GHz). The antenna is sufficient for covering the 2.4-GHz Bluetooth/WiFi band.
Millimeter wave (mm-wave) bands are becoming potentially attractive candidates for next generation communication systems. It is envisioned that high gain smart antennas will be one of the key enabling technologies for such systems. At mm-wave bands, where electrical size of an individual antenna becomes very small, the inclusion of a reconfigurable mechanism in the antenna becomes a great challenge...
A reconfigurable radiation pattern antenna is constructed using half-wave dipole antenna. Metal cylinders with pin diodes are added around the dipole antenna acted as reflector and cause the change in radiation pattern for particular direction. The reconfigurable antenna works up to 32 directions with minimum beam separation of 10°.
A compact dual-frequency antenna with two-port excitation and large frequency ratio is presented. It consists of a circularly-polarized (CP) microstrip patch antenna at 2.4 GHz and a linearly-polarized (LP) substrate-integrated cylindrical dielectric resonator antenna (DRA) at 60 GHz, resulting in a large frequency ratio of as high as 25. The two antenna parts are designed on a single substrate, giving...
A dual-polarized wideband substrate-integrated-waveguide fed aperture-coupled slot antenna array for 60 GHz is proposed. By cutting a semicircle shape on the edge of the crossed-slot antenna, the impedance bandwidth of the proposed antenna is effectively widen and achieves overlapped bandwidth of 16.7% for simulated |S11| and |S22|. In addition, over 35 dB isolation between two polarization and low...
This paper presents a low profile unidirectional UWB cavity backed antenna analyzed using The Theory of Characteristics Modes (TCM). The main goal of this work 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 cavity structure composed of a metallic ring, a circular waveguide and two circular...
A new robust design of the printed phased antenna array was developed and investigated. Results of numerical prediction of radiation, matching and scanning characteristics of a single printed bow-tie antenna and a new design of phased antenna array composed of these radiating elements are presented.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.