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.
Antennas, when used in devices having non-planar surface, essentially requires a more non-intuitive approach. In this paper, a planar microstrip ultra wideband (UWB) antenna is conformed to non-planar structures of different shapes suitable for non-planar devices and simulated. The design procedure is derived from the basic rectangular micro strip patch antenna. From the simulations, antenna parameters...
A study into the effect of a solar cell lattice on the performance of an Inverted-F antenna is presented. An FR-4 substrate with a lattice of copper electrodes printed on one side and a solid copper ground plane on the other is used to represent a polycrystalline solar cell. The effect of the lattice orientation on the performance of the Inverted-F antenna is discussed.
This paper presents a robust wide-area wireless sensor network for GNSS monitoring of fast flowing tidewater glaciers, in particular the Helheim glacier in Greenland which is approximately 15km in length and 5–7km wide. The proposed network comprises of a cluster of up to 25 GNSS-nodes sending positional information to a basestation via a 2.4GHz Zigbee link to form a robust wireless-sensor-network...
The performance of planar optically switched resonators integrated with optically triggered Silicon (Si) switches is described. The resonator structures are realised on 1.6mm thick Taconic substrate and operates between 3.75GHz and 5GHz (3dB level) with insertion loss as low as 1.35dB and 1.1dB when the switch is in its OFF and ON states respectively. An equivalent circuit representation of the designed...
In this paper, we propose a planar antenna for realization of beam steering operating at 2.8 GHz. A planar structure of 5 radiating patches is arranged systematically to obtain highly directional patterns. A gain of 12.82 dBi has been observed from simulation. The concept of switching is implemented in order to realize the beam steering. The dimensions are further optimized so as to minimize back...
The propagation of radio signals within the troposphere is influenced by the value of effective earth radius factor k, which is dependent on the lapse rate of refractivity in the lowest 1 km of atmosphere. One year of reliable, local radiosonde data, from June 2009 to July 2010, has been used to determine the values of effective earth radius factor k in the English Channel. The cumulative distributions...
In order to avoid the interferences from coexisting systems operating in 3.3–3.6 GHz, 5.15–5.35 GHz, and 5.725–5.825 GHz, an asymmetric triple band-notched antenna suitable for ultra-wideband (UWB) applications is proposed. The printed aperture antenna consists of a circular radiator on one side and a rectangular ground plane with a circular slot on the other side. The asymmetric shape is obtained...
This paper presents results of parametric studies in enhancing wireless communication system. An objective of the work has been to create a pass band square mesh-patch array Frequency Selective Surface (FSS) onto waveguides attached on/inside walls to increase productivity and efficiency through enhancing received signal power. Using the innovative model as a part of a wall assures signal strength...
A small tuneable MIMO antenna module is investigated for possible UMTS mobile applications. The radiators are realized as slotted planar monopoles. The two-element MIMO antenna module occupies a volume of 50.0 × 37. 5 × 1.6 mm3, and is printed onto a FR4 substrate. Low mutual coupling between the radiators is achieved by means of the addition of a coupling strip to a defected ground plane structure...
This paper describes the portability of a multiband antenna design over a printed circuit board (PCB) of different sizes. The antenna consists of two inverted-F antennas (IFA) operating at the same resonance frequency, for multiple-input multiple-output (MIMO) operation. The frequency range presented in this paper is EGSM900 for the low band and IMT-E for the high band, but the results can be extended...
The mobile phone antennas exhibit a very low real impedance value especially in lower LTE (698–787MHz) and GSM (824–960MHz) bands, since the antennas are electrically small compared to operating wavelengths at these bands. Obtaining sufficiently low reflection coefficient and high TRP in a considerable bandwidth from such an antenna is very challenging without exciting proper currents on the PCB of...
In this paper, we present designs for a microstrip line UWB monopole antenna and a CPW fed UWB monopole antenna. First, a monopole antenna to cover the entire UWB band of 3.1–10.6GHz is designed. Different types of tapers are investigated to achieve the impedance match over the desired band. Next, two band-rejection notches at 5.2GHz and 5.8GHz are introduced by combining two traditional band-notching...
This work presents novel techniques for producing substrates for flexible antennas. The technique we propose is based on the use of an already existing and widely used substrate material Polydimethylsiloxane (PDMS), where the dielectric properties of the substrate are adjusted by loading the PDMS with low or high permittivity inclusions. The low adhesion characteristics of PDMS are overcome by immersing...
In this paper, we present a patch antenna design that uses a ferrimagnetic compound (YIG) as part of its substrate. The antenna is designed to operate in the Ku band (14 GHz). We investigate the influence of the YIG compound on the antenna characteristics under the application of an external magnetic field parallel to the antenna surface. It was found that the proper application of the magnetic field...
We present in this paper indoor measurements at 2.45 GHz of a tripole antenna pair and investigate typical channel characteristics that include the antenna elements. Each of the two antenna arrays consists of three orthogonal co-located dipoles promising high capacity, irrelevant of their orientation. The impact of classic parameters related to polarization, correlation and time dispersion are analyzed...
The duplex filter is probably still the most expensive component in mobile handsets for the significant Transmitter (Tx) — Receiver (Rx) isolation required. This paper suggests to relax or even replace the duplex filter by equipping the Tx and the Rx with two separate antennas. The two antennas are different in the sense that one is balanced and the other is unbalanced. By properly controlling the...
Radiation by a microstrip patch antenna is well understood. Although typically such antennas are fed in a manner to achieve linear polarization, circular polarization is also of interest. Of more recent interest is the use of engineered composite materials (e.g. metamaterials) to control radiation. In some cases, inherently anisotropic materials have been characterized using isotropic inversion methods...
Ultra wideband (UWB) technology has been expected to communicate in very high data rates by wireless within closed environments, such as spacecrafts. With a view to replacing onboard wired interface buses by wireless connection, UWB and narrowband propagation were measured in a UWB frequency band (from 3.1 to 10.6 GHz) within a small spacecraft. While narrowband propagation resulted in considerable...
This paper presents a dual-band internal planar antenna suited for different phone form factors. It is shown that a high-Q self-resonating antenna element is adaptable to different platforms. The antenna aims at being frequency reconfigurable and a varactor will be used for that purpose. Simulations and measurements of S parameters, total efficiency and envelope correlation are presented at 796 MHz...
This paper deals with the design of a compact antenna with multi-band and tuning capability for agile communication standards within LTE bands. The design of a planar dual-band antenna at cellular system frequencies is described and an innovative tuning mechanism based on EM coupling of the tunable capacitor to the resonating element is proposed. The antenna tuning ability between communication systems...
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.