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 proposes a novel multi-stub ultra-wide band planar monopole antenna. The radiation patch of the antenna is composed of a pair of back-to-back E-shape-like stub elements. The E-shape-like stub element is the extension of the E-shape stub element, adding two semi-circle elements at the back of the E-shape stub element and extending the top of the E-shape stub element with an inverted L-shape...
A MIMO antenna with small size and ultrawideband (UWB) is proposed in this paper. The MIMO antenna has four basic antenna units that are placed vertically with each other and four embedded U-shaped metal frames. The improved isolation functions are achieved by utilizing the orthogonal polarization between each unit. It is demonstrated that this antenna can well meet the requirements of isolation and...
An insulation condition assessment method of the transformer is proposed in this paper. The set pair analysis and the expert evaluation method based on the set-valued statistics are adopted to assess insulation condition of the quantitative index and the qualitative index respectively according to the insulation condition assessment model of the transformer which is built. The subjective weight of...
Nowadays with the frequent occurrence of natural disasters, there is a great demand for accurate and fast novel localization techniques for search and rescue. Thanks for modern wireless communication technology, lots of people own a mobile phone today. In disaster scenarios, the radio signals of the phones can prove the existence of victims, which is referred to as spectrum sensing. Generally, the...
A novel coplanar waveguide (CPW)-fed compact ultrawideband (UWB) microstrip antenna is proposed for ultrawideband applications. By etching a mixed slots structure on the surface of the radiating patch, the area of it was greatly reduced and the impedance bandwidth was extended. The mixed slots include two semicircle and one rectangular slots. Similarly, through etching a pair of quarter-circle slots...
A novel printed compact triple-band antenna for WLAN/WiMAX applications is proposed in this paper. Due to the coupling between the 'comb' shape parasitic element and the multi-branch radiating element, three frequency bands which are suitable for WLAN/WiMAX are achieved. The simulated results show that by adding the parasitic element, the high frequency end cutoff frequency of the antenna is reduced...
Due to the increasing of natural disasters, a novel localization system for search and rescue would be developed. Considering the popularity of mobile phones, the radio signal generated by the mobile devices can be utilized for rescue and localization. This paper presents a phone-based localization system for search and rescue purpose and the studies of radio channel characteristics through both theoretical...
This letter addresses the fading statistics of a radio propagation channel in a ruins environment, which is of vital importance for a pedestrian localization system based on cellphone signals. The channel of ruins is investigated in eight typical rescue scenarios at two common mobile communication bands (900 MHz and 1.8 GHz). To characterize the channel, an empirical path loss model is parameterized...
This paper presents the study of radio propagation characteristics in disaster scenarios. Body effect on the propagation loss is evaluated via measurement. Moreover, experiments both in a typical indoor environment and in ruins are conducted for comparison. The attenuation and coherence bandwidth are analyzed.
A kind of hollow copper waveguide is demonstrated for THz wave, it is namely a simple copper tube. THz Time-domain Spectroscopy system (TDS) is used to measure the character of the waveguide. The experimental result shows that it can be used to transmit the THz wave with high coupling efficiency, low attenuation and low dispersion. A lowest attenuation of 0.0046dB/mm at 0.557 THz is obtained for a...
As the new carrier of the campus culture in online environment, campus BBS has played an important role in harmonious culture constructing. The paper analyses the contrastion of the campus BBS in campus culture constructing between China and The United States, including Chinese college students suffer shackles from the school and home more than American college students, and they have more desire...
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.