Results 211 to 220 of about 7,852 (255)
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A reconfigurable high-frequency phase-locked loop
Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412), 2004Reconfigurable phase-locked loops (PLLs) present the advantage of fast-frequency acquisition combined with narrow-noise bandwidth, since their parameters can be dynamically adjusted. High-frequency PLLs are generally implemented by means of analog circuits which are not easily reconfigured during operation.
Fernando Rangel de Sousa, Bernard Huyart
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Frequency-Reconfigurable Circularly Polarized Omnidirectional Antenna
IEEE Transactions on Antennas and Propagation, 2022A concept of frequency-reconfigurable circularly polarized (CP) antenna with omnidirectional radiation characteristics is introduced. The antenna is based on a center-fed circular patch with shorting vias, surrounded by three arc-shaped arms. Omnidirectional CP is attained through its two orthogonal radiators with a quadrature phase difference.
Ken Paramayudha +3 more
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Frequency-Reconfigurable Monopole Antennas
IEEE Transactions on Antennas and Propagation, 2012A novel coplanar-waveguide (CPW) bandpass filter using short-circuit slotlines and varactor diodes is introduced. This bandpass filter, when integrated with a CPW wideband antenna, produces frequency agility with a wideband mode and a continuous narrowband mode.
Abubakar Tariq, Hooshang Ghafouri-Shiraz
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Frequency reconfigurable antennas: A review
2017 International Conference on Signal Processing and Communication (ICSPC), 2017The recent trends in wireless communication systems show that the demand for devices able to operate within more frequency bands has been inflated considerably. This has enhanced the evolution of antennas that are able to be operated at multiple frequency bands.
Ros Marie C Cleetus, G. Josemin Bala
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PIFA frequency reconfigurable antenna
2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2014A design of frequency reconfigurable PIFA antenna is presented in this paper. The antenna consists of halves of three concentric rectangular patches. Five RF PIN diodes are inserted in proper locations for frequency reconfigurability. Four switching cases are considered. The first case (all switches are ON) results in a single-band operation at 850 MHz
M. Abou Al-alaa +3 more
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A frequency reconfigurable slot antenna
2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007This paper proposed a frequency reconfigurable CPW center-fed slot antenna. Four pin-diodes are utilized to switch the length of the slot. By tuning the different pairs of diodes on or off, three resonant frequency bands can be obtained. The simulated and measured results validate this concept.
Yibo Chen +3 more
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Reconfigurable Pixel-Layer Isolator for Frequency-Tunable On-Frequency Repeaters
IEEE Antennas and Wireless Propagation Letters, 2014Peer ...
Rodrigo López, Daniel +2 more
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Thermographic Investigation of Frequency-Reconfigurable Wearable Antennas
2022 16th European Conference on Antennas and Propagation (EuCAP), 2022The thermal behavior of a frequency-reconfigurable wearable textile antenna is investigated in this paper through in-frared thermography. The relationship between the temperature of the textile antenna and the input power is experimentally considered to identify the antenna hot spots.
Dang, Quoc Hung +2 more
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Pentagon slot resonator frequency reconfigurable antenna for wideband reconfiguration
AEU - International Journal of Electronics and Communications, 2015Abstract With the advances in the field of communication and the current state of affairs in the development of antennas the need of compact multiband, multifunctional and cost effective antenna is increased. The study of reconfigurable antennas has made great progress in recent years.
Deepali K. Borakhade, S.B. Pokle
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Frequency reconfigurable origami quadrifilar helical antenna with reconfigurable reflector
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015This paper presents a novel origami quadrifilar helical antenna (QHA) that can reconfigure its operating frequency between 2.07 GHz, 3 GHz and 4.45 GHz. An origami reflector was designed to enhance the gain of the QHA for all the operating frequencies. Typical simulated realized gains of this origami QHA with reconfigurable reflector are 15.13 dB at 2 ...
Xueli Liu +2 more
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