hc e in normal metallic to hc 2e in superconducting loops

... is then received, filtered and despread using a PN sequence generator In this measurement system, the chip rate of the PN sequence generator determines the time resolution The sliding correlator ... together and directed to the negative port of a balanced, differential detector Since the difference between the central frequencies of the two replicas is outside the detector bandwidth, beating ... pulse shapes were generated based on SPM The technique relied on the timeto-frequency mapping that accompanies SPM spectral broadening of pulses, in implementing all-optical edge detectors The edge...

Ngày tải lên: 29/06/2014, 13:20

... chứa vector H (azimuth plane) với [ f(φ), θ =π /2 ] hướng tính mặt phẳng chứa vector E (elevation plane) với [g (θ), φ= const ] Hình 1.5: Giản đồ xạ vô hướng anten Trang 10 Mặt phẳng E định ... Không gian bao quanh anten chia thành vùng; (a) trường gần tác động trở lại (reactive near-field), (b) trường gần xạ (radiating near-field, Fresnel) (c) trường xa (Fraunhofer) hình 1.7 Vùng trường ... = 2b) tính to n giữ diện tích tương đương với CM Tỷ lệ ellipticity chọn là: a / b =1.1, đặt tên EM1 EM cấp nguồn dọc theo trục nhỏ (EMA) trục (EMB) Để tính to n fL anten EM, L r anten đơn cực...

Ngày tải lên: 21/08/2015, 16:38

... low-cost feeder system The broadband input impedance and the high gain are obtained in the calculation and the measurement During the past few decades, there has been growing interest in the use of ... increase measurement uncertainty These errors and their effect on the entire uncertainty of the measurement are investigated in the chapter 11 in case of broadband Bilog antenna, a typical receiving ... the real and imaginary part of the input impedance are plotted versus frequency, for different values of the distance between the feeding point and the vertex It is interesting to note that when...

Ngày tải lên: 21/06/2014, 11:20

... wavelengths corresponding to the lower and upper frequency limits At low frequencies, the larger antenna elements are active As the frequency increased, the active region moves to the shorter elements ... independent of the frequency These two principles are presented well in reference (Rumsey, 1957) which title is Frequncy independent antenna The third principle is to design the antenna structure such ... where the Ln is the length of nth element, Rn is the spacing of elements nth, dn is the diameter of element nth, and sn is the gap between the poles of element nth The frequency limits of the...

Ngày tải lên: 21/06/2014, 11:20

... Lines 53 exceed since the aperture efficiency of a single patch begins to drop, as W/L increases beyond · To increase bandwidth, increase the substrate height and/or decrease the substrate permittivity ... affect resonant frequency and the impedance matching) · To increase the input impedance, decrease the width of the feed lines attached directly to the patches as well as the width of the lines ... power evenly with 90 degree phase difference between the outputs The output signals are then extended to the patch-feed interfaces using microstrip transmission lines The entire system is designed...

Ngày tải lên: 21/06/2014, 11:20

... frequency (c) Insertion loss of output to delay and no delay path vs frequency 3.5 The envelope detector The output of intermediate receiver (out to detector) is the input of the envelope detector ... Components is used as a detector 3.6 The Selective delay section and circuit design The intermediate receiver board output (output to delay path) is entered to the selective delay section The selective ... detector The detector is used to detect the envelope of RF signal to make the video signal The detector must have a very fast pulse response and wideband frequency response ACTP1528N from Advanced...

Ngày tải lên: 21/06/2014, 11:20

... The specific design features of each part of the whole antenna system are detailed below (a) Reflector Geometry To achieve aperture synthesis in one plane, the shape of the reflector is a singly-curved ... The choice of an offset feed prevents aperture blockage and reduces the diffracted energy from the feed structure in the test region The main causes of errors on the field in the quiet zone are ... give the results of one element in the array The radiation patterns for other elements are similar The sidelobe levels in H-plane are below the -20dB requirement, which are considered quite well,...

Ngày tải lên: 21/06/2014, 11:20

... then considered as being proportional to the near field at the location of the element The second method uses the linear relation between the feeding of each element and the measured near field ... for neglecting the difference between the values of antenna factors of these antennas Since receiving antenna varies its height with respect to height of tested equipment during the measurement ... budget of EMI measurement of test laboratories In general, we can recognize three types of negative effects on the uncertainty of the measurement:  effect of test site equipment (of the measuring...

Ngày tải lên: 21/06/2014, 11:20

... Table ΔSLLi (dB) for the sidelobes on the left of the mainlobe This section continues with detailed studies for several sidelobe levels, where dependences on the steering angle, sensor spacing ... steering angle ones The highest sensitivity is shown for the steering angle All these analyses have been done for positive steering angles In the case of negative steering angles values, the behaviour ... angle causes an increase in SLL Firstly, the average level values for the directional case are below the values of the omnidirectional case, but with an increasing steering angle, average level...

Ngày tải lên: 21/06/2014, 11:20

... resulting attenuation statistics tend to be higher due to the absence of moving-average effects Before proceeding to use the SST results in subsequent analyses, a comparison is made on the different ... with time lag compared to the result from Barcelona Despite the vast difference in the length of the measurement period, this finding might indicate that even the convective rain events in Surabaya ... Table Number of Measured Samples in Each Rain Rate Bin For model fitting purpose, the average DSD curves for the lowest two intervals of rain rate are excluded due to irregularities in their...

Ngày tải lên: 21/06/2014, 11:20

... is measured in terms of frequency tuning range (FTR) corresponding to center frequency To make the fixed frequency oscillator into a variable frequency oscillator, it is necessary to tune the capacitive ... characteristics, and the rest of the parameters of the meander line are estimated by fitting to the measured results, because our main goal is to develop a simple model which can be incorporated in ... transconductance for high-gain amplifier design, while fmax reduces with the increased total gate width due to the increase of parasitics Note that fT is relatively less sensitive to the increased finger...

Ngày tải lên: 21/06/2014, 11:20

... have been presented, we proceed to combine them in order to determine the wideband Z matrix representation of the complete structure For such purpose, we first outline a procedure to solve the ... order to recover more accurate results, even at very high frequencies, it has been needed to increase the number of 410 Microwave and Millimeter Wave Technologies: Modern UWB antennas and equipment ... 1/k dependence By introducing the value of k0 into (7), we reduce the number of accessible modes N (  ) required to obtain an accurate representation of the planar junction in the whole frequency...

Ngày tải lên: 21/06/2014, 11:20

... additional terms are considered in (107), i .e when k0  In order to recover very accurate results in a very wide frequency band, it has been needed to increase the total number of poles to 75, thus involving ... shortest one that the signal generator in use could generate These results indicate that the pulse width needs to be smaller to better evidence the effects by NGD- and compression For that reason, ... (see thin red line and thick blue one, respectively, in Fig 7(b)) were resynchronized from the same reference signal (CH2 channel) It is interesting to note that the input-pulse width was the...

Ngày tải lên: 21/06/2014, 11:20

... provide a dedicated procedure to regulate it depending on the parameters of the magnetron operational mode In the developed radars (see Section 0) the following proven principle is used The filament ... There are some more benefits from the utilization of ferrite beads They restrict the change rate of magnetron current resulting in a great reduction of electromagnetic interferences and an increase ... shorter as possible (see Section 0) 4.3 Receiver 4.3.1 General consideration The principles to develop receivers for the magnetron based radars are the same as for any other systems Nevertheless,...

Ngày tải lên: 21/06/2014, 11:20

... Electrical and Electronic Engineers ISI Inter-Symbol Interference ITU International Telecommunications Union LPF Low-Pass Filter MSA Microstrip Antenna MS-LPDA Microstrip – Log Periodic Dipole Array ... Filter BW BandWidth CDMA Code Division Multiple Access CEPT European Conference of Postal and Telecommunications DSP Digital Signal Processing EIRP Equivalent Isotropically Radiated Power FCC Federal ... FCC Federal Communication Commission FNBW First Null BeamWidth GPS Global Positioning System GSM Global System for Mobile Communications HFBW Half-Power BeamWidth IEEE The Institute of Electrical...

Ngày tải lên: 22/06/2014, 14:47

... manner to eliminate interfering users’ signals Mathematically, the receiver operates as follows First, the received signal enters chip j’s receiver Here, the carrier component is removed from the ... measured by coherence time, TC Coherence time, in turn, determines the number of independent fades over duration TS Computation of the coherence time requires modeling a CI Chip-Shaped DS-CDMA Merger ... is employed to recreate the jth chip with a joint time-frequency diversity benefit Using the linear combining scheme discussed in the next paragraph, we l, j combine the rn,h over time components...

Ngày tải lên: 23/06/2014, 01:20

... low-cost feeder system The broadband input impedance and the high gain are obtained in the calculation and the measurement During the past few decades, there has been growing interest in the use of ... wavelengths corresponding to the lower and upper frequency limits At low frequencies, the larger antenna elements are active As the frequency increased, the active region moves to the shorter elements ... the real and imaginary part of the input impedance are plotted versus frequency, for different values of the distance between the feeding point and the vertex It is interesting to note that when...

Ngày tải lên: 27/06/2014, 01:21

... half-wavelength resonant frequencies At the lower resonance, the vertical strip is considered as part of the radiating element The dash-lines depict the half-wavelength resonant Therefore, the effective ... weaker than that of at the lower resonance Therefore, the effective radiating length is 30 mm, and fh  5:0 GHz The difference between the estimated and measured higher resonating frequencies ... validated that (1) could be used as design guidelines to estimate the resonating frequencies for the proposed antenna These guidelines are not applicable when the height of the patch is raised from...

Ngày tải lên: 10/07/2014, 01:20

... antenna can be designed in order to meet challenging specifications over a very wide frequency band The patented design of [3] was analyzed, and some changes are proposed in order to get better ... if we feed the antenna with a suitable matching network the antenna would be well matched over the entire desired frequency band Measured and simulated gain in broadside direction is plotted in ... bandwidth increases and the frequency band where radiation pattem does not change decreases In order to get an ultra-wide matching band maintaining the broadside maximum radiation, a longer slot bent...

Ngày tải lên: 10/07/2014, 01:20

... India, in 1985 He received the B.Eng degree in electronics and telecommunication from Thakur College of Engineering and Technology, Mumbai, India, in 2006, and the M.Sc degree in electrical engineering ... straight feed line and tilted feed line designs were investigated with two different substrate materials of the same thickness It was observed that, for the tilted feed line Design B an impedance bandwidth ... agreement The antenna was also experimentally verified for the group delay using the two antenna arrangement [20], where the transmit and receive antennas are facing each other while connected to...

Ngày tải lên: 10/07/2014, 01:20