Results 251 to 260 of about 272,036 (281)
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Generation and transmission of phase-stable coherent multi-band linear frequency modulated signals
Optics Letters, 2021We present a coherent multi-band linear frequency modulated (LFM) signal generation and transmission system based on dual optical frequency combs (OFCs). In the proposed scheme, the two OFCs are phase-locked to ensure high coherence of the generated multi-band LFM signals.
Baiyu Li +4 more
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Low-profile broadband Core-Isolator for multi-band module
2011 IEEE MTT-S International Microwave Symposium, 2011A novel broadband Core-Isolator for modules of multi-standard and multi-band mobile handsets has been developed successfully. A new circuit configuration for extending the isolation frequency band is proposed. The equations of the insertion loss and the isolation bandwidth of a two-port isolator with resonant elements are derived from equivalent ...
Takaya Wada +3 more
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Multi-band SIW antenna with modulated metasurface at 5G frequency
2018 IEEE Indian Conference on Antennas and Propogation (InCAP), 2018This paper proposes a multi-band SIW antenna which is linearly polarized. The antenna consists of a T-shaped radiator inscribed on the upper side of the dielectric substrate. This radiator is responsible for multi-band occurrence. The operating frequency is chosen to be 28 GHz, which is a valid selection for 5G applications.
Priya Suresh Nair +2 more
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Advanced multi-band modulation technology for underwater communication systems
2023In recent years, underwater communication (UWC) systems have been attractive in the development of civilian and military applications. However, there are many challenging issues surrounding such communication systems due to severe channel conditions such as ambient noise, frequency selectivity, multi-path with significant tap delays and Doppler shifts.
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Multi-Band RF Downconversion Over Fiber With a Single Modulator
IEEE Photonics Technology Letters, 2018We present the theory for an experimental verification of a new technique to combine multiple microwave signals populating a wide spectrum into a single, small band for further relay or processing. The method is an extension of well-known RF-over-fiber downconversion techniques but with multiple local oscillators (LOs) to translate widely spaced ...
Bryan M. Haas, Jason D. McKinney
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IEEE Transactions on Circuits and Systems I: Regular Papers, 2020
This paper presents a reconfigurable delta-sigma modulation (DSM) architecture for concurrent multi-band transmission. The reconfigurability in terms of carrier spacing and the number of simultaneous carrier transmission is useful for applications such as carrier aggregation in 5G. This paper uses $4^{th}$ order reconfigurable multi-band DSM (RMB-
Nishant Kumar +2 more
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This paper presents a reconfigurable delta-sigma modulation (DSM) architecture for concurrent multi-band transmission. The reconfigurability in terms of carrier spacing and the number of simultaneous carrier transmission is useful for applications such as carrier aggregation in 5G. This paper uses $4^{th}$ order reconfigurable multi-band DSM (RMB-
Nishant Kumar +2 more
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Research on Multi-band Fiber Transmission System with Multi-carrier and Adaptive Modulation
2021 19th International Conference on Optical Communications and Networks (ICOCN), 2021In this paper, a novel multi-band transmission system based on multi-carrier and adaptive modulation is proposed. The simulation results show that the scheme can effectively improve the performance of system.
Xiaofeng Gao +6 more
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Multi-band printed monopole antenna for ubiquitous module in mobile station
2nd European Conference on Antennas and Propagation (EuCAP 2007), 2007Current mobile communication systems in W-CDMA systems are assigned three frequency bands in Japan. We present and investigate a multi-resonant printed monopole antenna (80×120×1.6 mm3) for a small wireless packet communication module (called a ubiquitous communication module).
Y. Kimura, Y. Ebine, T. Imai
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Stacked FET structure for multi-band mobile terminal power amplifier module
2013 IEEE MTT-S International Microwave Symposium Digest (MTT), 2013A multi-band PHEMT 5 × 7 mm2 PA module for mobile applications is described based upon a stacked FET structure. The PA has 28.5 dBm linear output power and over 40 % PAE with -38 dBc ACLR for a 3.2 V supply voltage, covering a wide frequency range of 698-915 MHz, 1430-1450 MHz and 1710-1980 MHz.
Hideshi Motoyama +4 more
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Modulation of a multi-band tunable metamaterial with metal disk array
Optical Materials, 2020Abstract A multi-band metamaterial with vanadium dioxide (VO2) layer is proposed, manufactured, and measured in the terahertz (THz) band. Two absorption peaks (P1 and P2) are excited at 33.88 THz (60% amplitude, and 0.7 THz full width at half maximum (FWHM)) and 37.94 THz (76% amplitude, and 1.62 THz FWHM) at room temperature. The P1 peak is achieved
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