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.
In this paper, the design of a polarization diversity tunable filtenna (filter-antenna) for overlay cognitive radio applications is presented. The frequency tuning technique is based on integrating a tunable bandpass filter into the feed line of a wideband printed antenna. The proposed structure is able to tune its operating frequency, as well as, radiate right handed and left handed circularly polarized...
In this paper, a tunable RF front-end sensing receiver for overlay cognitive radio applications is presented. The WLAN IEEE 802.11 g commercial wireless standard key specifications are targeted in the proposed receiver. The design includes a tunable filter-antenna, low-noise amplifier, tunable bandpass filter, single-ended balanced mixer, and a variable gain IF (Intermediate Frequency) amplifier....
Slotted waveguide antenna (SWA) arrays offer clear advantages in terms of their design, weight, volume, power handling, directivity, and efficiency. For broad-wall SWAs, the slot displacements from the wall centerline determine the antenna's sidelobe level (SLL). This paper presents an inventive procedure for the design of broadwall SWAs with desired SLLs. For a specified number of identical longitudinal...
This paper presents frequency-tunable microstrip antennas for cognitive radio applications. The approach is based on electronically adjusting the antenna's operating frequency by integrating tunable open loop resonator (OLR) based bandpass filters into wideband antenna structures. The same technique is utilized to design cognitive radio pattern and polarization diverse tunable filter-antennas. A good...
This paper presents an improved Vlasov antenna with a novel cut shape suitable for high power microwave applications. The curved shape of the proposed cut totally eliminates the sharp edges and angles present in Vlasov antennas with Step and Bevel cuts. A Vlasov antenna, designed for operation at 3 GHz, is used to compare the three cut types. In addition to being better suitable for high power microwave...
A single-port small-size antenna for cognitive radio (CR) applications is presented. The antenna is based on an ultra-wideband (UWB) design and has a reconfigurable bandpass filter integrated in its feed line. The UWB operation is required for the sensing task in a CR system. Upon activating the filter, the UWB frequency response is transformed into a tunable narrowband one, which is needed for the...
A planar antenna for employment in overlay and underlay ultra-wideband cognitive radio is presented in this paper. The antenna can be operated as ultra-wideband, for underlay CR and for sensing in the overlay CR. When used in the overlay CR mode, the proposed antenna can selectively have one, two or three notches in the WLAN, WiMAX, and U-NII bands, to prevent interference to primary users operating...
A polarization-reconfigurable slot antenna, for WLAN applications, is presented in this paper. The antenna incorporates a reconfigurable Wilkinson power divider-based feed network, which couples electromagnetic energy to a decagonal slot in the ground plane. The approach, presented herein, is based on electronically reconfiguring the phase difference, between the antenna's feeding ports, to achieve...
This paper presents a reconfigurable radio front-end antenna scheme suitable for cognitive radio communications. Our scheme comprises of an UWB antenna structure (antenna-1) and a reconfigurable antenna structure (antenna-2) incorporated together on the same substrate. The UWB antenna-1 is used for channel sensing while the reconfigurable antenna-2 is designed to frequency-hop between pre-determined...
This paper presents a new antenna design for cognitive radio communication. A prototype antenna was fabricated and tested. A good agreement was found between the simulated and measured data. A good coupling was achieved between the sensing and the communicating antenna.
In this paper, a new approach for removing redundant components from reconfigurable antennas is presented. The approach is based on graph models and it minimizes the number of electronic components used. As an example, a reconfigurable U-Koch microstrip antenna is investigated and redundant switches are removed. The antenna is redesigned and the performance of the optimized prototypes is tested and...
In this paper, two designs of an ultra-wideband antenna with reconfigurable band notches are presented. The first design is based on several nested complementary split-ring resonators, whereas the second has two identical split-ring resonators. Electronic switches mounted across or along these resonators serve to activate or deactivate their corresponding band notches, thus leading to band-notch reconfigurability...
This paper presents a low-cost ultra-wideband microstrip antenna for wireless communications. Printed on a 40times50times1.83 mm3 Isola Gigaver 210 substrate, the antenna features a microstrip feed line with two 45deg bends and a tapered section for size reduction and matching, respectively. The ground plane is partial and comprises a rectangular part and a trapezoidal part. The patch is a half ellipse,...
In this paper, a novel printed-circuit-board (PCB) antenna that employs electronic tunability is presented. The antenna is based on a 10 mm times 25 mm times 1.6 mm FR4-epoxy substrate, is microstrip-line fed and has a partial ground plane. The proposed antenna is designed and simulated using the Finite-Element Method (FEM) and the Method of Moments (MoM) for two different switching conditions. The...
In this paper, we propose a low-cost small-sized microstrip antenna based on a trapezoidal connection between a double-Sierpinski-carpet-shaped (2nd iteration) patch and an I-shaped feed line. The ground plane is partial and is flushed with the feed line. The fundamental characteristics of the proposed design over the UWB frequency band are illustrated herein.
In this paper, a novel planar printed monopole antenna for ultrawideband (UWB) applications is presented. The proposed antenna is based on a compact-size 25×20×1.6-mm3 FR4-epoxy substrate and has a diamond-like patch. Slots with the shape of a 45°-rotated 2nd-iterated Sierpinski-carpet are incorporated in the patch. The antenna is mictrostrip-line fed and has a partial ground plane flushed with the...
This paper presents a low-cost ultra-wideband microstrip antenna for wireless communications. Printed on a 4cm × 5cm × 1.6mm FR4-epoxy substrate, the antenna features a microstrip feed line with two 45-degree bends and a tapered section for size reduction and matching, respectively. The ground plane is partial and comprises a rectangular part and a semi-circular part, where two identical rectangular...
In this paper, a novel ultrawideband (UWB) antenna with co-planar waveguide (CPW) feed is presented. The antenna is based on an egg-shaped conductor printed on a 30??40 mm2 FR4 substrate of 1.6-mm thickness. Two configurations of the antenna are studied. In the first, the ground plane features a large egg-shaped slot, and in the second, the ground plane is partial and rectangular in shape. The measured...
In this paper, a small-size low-cost printed monopole antenna for ultra-wideband operation is presented. The proposed antenna, which was designed and simulated using the FEM-based HFSS, is based on a 20 mm ?? 40 mm ?? 1.6 mm FR4-epoxy dielectric, is microstrip-line fed and has a partial ground plane flushed with the feed line. To verify its frequency response, the antenna is also simulated using CST...
In this paper, a novel printed-circuit-board (PCB) antenna that employs electronic reconfigurability is presented. The antenna is based on a 1.6 mm-thick FR4-epoxy substrate with dimensions 1 cm ?? 2.5 cm, is microstrip-line fed and has a partial ground plane. The proposed antenna is designed and simulated using the Finite-Element Method (FEM) and the Method of Moments (MoM) for four different switching...
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.