- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
FREQUENCY RECONFIGURABLE TRIPLE BAND-NOTCHED ULTRA-WIDEBAND ANTENNA WITH COMPACT SIZE
摘要： A compact planar recon?gurable triple band-notched UWB Microstrip antenna is proposed in this paper for UWB applications. A band rejection at ITU 8-GHz is generated by inserting an inverted U-shaped metallic strip at the slotted ground plane. Moreover, by cutting two slots on radiating patch, the second rejection at 3.6 GHz for WiMAX and the third rejection at 5.5 GHz for WLAN application are generated. Then, by embedding two (PIN) diodes along the patch slots, switchable dual or single band-notched behavior is added to the antenna performance. The simulated and measured results show that the antenna can operate in a wider bandwidth from 3.1 GHz to 11 GHz, and it has a good omnidirectional radiation pattern with stable gain. Furthermore, the designed antenna has a simple structure and compact size of 20 × 20 mm2. The proposed antenna can use the full potential of UWB frequency range with recon?gurable band-notched behavior at 3.6, 5.5, 8.1 GHz to avoid interference with WiMAX, WLAN, ITU systems respectively.
关键词： WLAN,band-notched,WiMAX,recon?gurable,UWB antenna,ITU
更新于2025-09-23 15:21:01
-
[IEEE 2019 IEEE International Conference on Distributed Computing, VLSI, Electrical Circuits and Robotics (DISCOVER) - Manipal, India (2019.8.11-2019.8.12)] 2019 IEEE International Conference on Distributed Computing, VLSI, Electrical Circuits and Robotics (DISCOVER) - Improvement of health and well-being of human beings using tunable white LEDs
摘要： With the introduction of the International Telecommunication Union—Radiocommunication Sector (ITU-R) Recommendation BT.2020 (Rec. 2020) color space for ultrahigh de?nition television, the development of wide-gamut displays has become a high priority. To measure the relative gamut sizes of wide-gamut displays, it is herein proposed that the International Commission on Illumination (CIE) 1931 xy chromaticity diagram be used as a practical single metric rather than the nominally perceptually uniform CIE 1976 u'v' chromaticity diagram because of the high correlations between the Rec. 2020 gamut area-coverage ratios in the xy diagram and the volume-coverage ratios in the CIE 1976 L*a*b* and CIE 1976 L*u*v* color spaces. This paper explains why using the perceptually nonuniform xy diagram is counterintuitively appropriate to measure display gamut sizes by presenting a quantitative analysis of the gamut coverage in terms of hue. The argument is made that performing planimetry in the u'v' diagram, whose perceptual uniformity is valid only when the luminance is constant, does not yield accurate display gamut sizes, because the magenta region area is overestimated and the yellow region area is underestimated. Furthermore, some limitations on the use of planimetry for measuring display gamut sizes of multiprimary displays are discussed, and the color light output standard is proposed as a complement to practical planimetry using the xy diagram.
关键词： ultrahigh de?nition television,display gamut size,Chromaticity diagram,Recommendation ITU-R BT.2020,planimetry,wide color gamut
更新于2025-09-16 10:30:52
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Multi-Band Optical Systems to Enable Ultra-High Speed Transmissions
摘要： Current forecasts indicate that the fastest growing IP-traf?c is in metro and data center interconnect (DCI) [1]. The exploitation of the entire low-loss spectrum of single-mode ?bers (SMF) (from 1260 nm up to 1620 nm) was proposed to avoid the predictable capacity crunch and the eventual need for a new ?bre infrastructure roll-out. First analytic result considering multi-band (MB) transmission (from O- to L-band) hint an achievable traf?c load exceeding 200 Tb/s for a 500 km link in a single SMF [2]. The maximum transmittable capacity over ITU-T G.652D SMF, which is the mainly deployed ?ber type [3], is evaluated in this work. Three different ?ber span lengths are considered: 40 km, 60 km and 80 km. A high level overview of the MB setup is depicted in Fig. 1 (left). The system is composed of a MB transmission bench composed of {L, C, S, E, O}-band transmitters. 50 GHz spaced polarization multiplexed (PM)-MQAM signals with root raised cosine shaping (roll-off = 0.15) and a symbol rate of 32 Gbaud are multiplexed and launched into the ?ber link. A 2 nm guard-band between adjacent bands is assumed. At the receiver side, the bands are de-multiplexed, ampli?ed and then demodulated. We assume lumped ampli?ers: Praseodymium doped ?bre ampli?er(DFA) in O-band [4], Bismuth DFA in E-band [5], Thulium DFA in S-band [6] and Erbium DFA in C- and L-bands. A noise ?gure of 6, 5.5, 7, 6 and 7 dB are assumed for {L, C, S, E, O}-band ampli?ers, respectively. The wavelength ranges and number of channels in each band are reported in Table 1. The local-optimization global-optimization (LOGO) approach [7] is employed to optimize the launched power. The overall signal-to-noise-ratio (SNR) is estimated considering the impact of non-linear interference (NLI) which is evaluated using the generalized Gaussian noise (GGN) model [8]. The GGN model takes into account the frequency dependence of the ?ber loss, the chromatic dispersion and the stimulated Raman scattering (SRS). Finally, the achievable capacity assuming a ?exible transceiver capable to completely exploit the available SNR is computed.
关键词： ultra-high speed transmissions,ITU-T G.652D SMF,capacity crunch,single-mode fibers,multi-band optical systems
更新于2025-09-11 14:15:04
-
COMPLIMENTARY SPLIT RING RESONATOR INSPIRED MEANDERED CPW-FED MONOPOLE ANTENNA FOR MULTIBAND OPERATION
摘要： A novel design of Meandered Coplanar waveguide (CPW) fed CSRR loaded multiband antenna is presented in this paper. A compact triple-band antenna is designed by etching CSRR slots on the radiating element. The proposed antenna shows good performance at all resonant frequencies. The simulation results are discussed and compared with the measured ones. The e?ects of CSRR loading on the radiating element are explained. Parametric studies are carried out and explained in detail. The proposed antenna is fabricated and measured, and the results are compared with the simulated ones. CSRR permittivity characteristics are explained to validate the results. The proposed antenna can be used for C-band, Wireless Local Area Network (WLAN) and International Telecommunications Union (ITU) applications.
关键词： WLAN,Meandered Coplanar waveguide (CPW),CSRR,multiband antenna,C-band,ITU
更新于2025-09-10 09:29:36
-
[IEEE 2017 IEEE International WIE Conference on Electrical and Computer Engineering (WIECON-ECE) - Dehradun (2017.12.18-2017.12.19)] 2017 IEEE International WIE Conference on Electrical and Computer Engineering (WIECON-ECE) - A Rectangular Monopole UWB Patch Antenna with CSRR slots having dual band notch Characteristics
摘要： A planar monopole antenna for ultra–wide band (UWB) application has been presented in this letter. In order to gain an excellent band–rejection characteristic at WLAN band and ITU band, a rectangular shaped patch and a CSRR slot with two resonators near the feed line has been designed. The performance of the proposed antenna is investigated by using the software CST MW Simulator and the results achieve good impedance matching over an operating bandwidth of 3.4 – 13.60 GHz, which meets the requirement of UWB application well. Dual band notch curves have been achieved by inserting a slot in the patch and by location two resonators near the feed lines. The proposed antenna has good return loss graph having two notches first covering the WLAN band and notching the 5.5GHz second at 7.6GHz. Surface current distribution at various frequencies is also shown in the letter with few radiation pattern graphs in E- plane and H-plane
关键词： CSRR Slots,FR-4,WLAN,Two resonators,Notched Frequency Band,Feed Adjustment,ITU-Band
更新于2025-09-10 09:29:36