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.
The effects of mutual coupling on the performance of three 4×4 Ka-band antenna arrays consisting of three types of circularly polarized radiating elements are investigated when their beams scan from −30° to +30° off the boresight. The effects on active reflection coefficient (ARC) and axial ratio (AR) at the scanning beam directions are examined. It is found that to keep desired low ARC and acceptable...
a compact substrate intergrated waveguide (SIW) bandpass filter (BPF) is proposed for millimeter-wave (mmW) application. Four vias are located inside the SIW cavity in the form of rotationally symmetrical structure to provide transmission zeros at upper-stopband. As design examples, one substrate integrated waveguide bandpass filter prototype using Low Temperature Co-fired Ceramic (LTCC) on single...
An ultra high frequency (UHF) electrically large near-field RFID reader antenna using segmented loop unit is proposed to enlarge the interrogation zone. The proposed antenna is composed of two segmented loops with one common side and a feeding network. Each loop has a uniform and single direction flowing current itself. By providing reverse-direction flowing current to the two segmented loops, the...
In case of three-phase short circuit fault occurring at the terminal of a doubly-fed induction generator (DFIG), the rotor current characters of DFIG are analyzed from the viewpoint of the flux linkage, and the expression of the rotor current is deduced together with the estimated expression of the maximum rotor current. Based on above analysis, the max rotor currents and their appearing times with...
Near-field radio frequency identification (RFID) technology has been traditionally used at low frequency (LF) and high frequency (HF) bands; now developing this technology at ultra high frequency (UHF) band is of increasingly interest. Designing a UHF near-field RFID reader antenna is one of the most challenging tasks. Traditional loop antennas cannot operate properly at the UHF band when the antennas...
A segmented loop antenna is presented for ultra high frequency (UHF) near-field radio frequency identification (RFID) applications. Even though the perimeter of the loop is comparable to the operating wavelength, the proposed segmented line configuration allows current along the loop to remain in phase so that a strong and uniform magnetic field is generated in the region surrounding the antenna....
Some key aspects of two different concepts of configurable antennas for future mobile terminal have been addressed in this paper. It has been shown that a coupling element in combination with a configurable tuning circuit can be used to excite the chassis of the mobile terminal to act as the entire antenna in many different frequency bands. However, when both the coupling element and the tuneable...
Intermittency are commonly observed by practicing power supply engineers in their design workbenches. It shows to be a symmetrical period-doubling bifurcation in time domain with fixed long intermittent period. Sometimes it is called "breathing". Such kind of operation mode is usually undesired and can be avoided by means of screen technique or modifying the circuit parameters. This paper...
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.