Relevant bibliographies by topics / Frequency Agile Circuits

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Frequency Agile Circuits'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Frequency Agile Circuits"

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Fu, Qianhua. "A low phase noise and frequency agility synthesizer for millimeter-wave transceiver." International Journal of Microwave and Wireless Technologies 9, no. 8 (April 11, 2017): 1611–18. http://dx.doi.org/10.1017/s1759078717000307.

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With the increasing demand of millimeter-wave (MMW) communication, the performance of its frequency synthesizer has high requirements. In this paper, a multiple conversion mechanism, which used hybrid frequency synthesis technique is presented. Some key modules include linear frequency-modulated generator, agile, and low phase noise local oscillators (LOs), automatic gain control, receiver front-end circuit, and MMW LO circuits are discussed and simulated to verify correctness of the mechanism. The experimental results show that, spurious is better than −65 dBc, phase noise is no more than −80 dBc/Hz@1 kHz, and the maximum frequency-hopping time is <1.8µs.
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Lourandakis, E., M. Schmidt, S. Seitz, and R. Weigel. "Reduced Size Frequency Agile Microwave Circuits Using Ferroelectric Thin-Film Varactors." IEEE Transactions on Microwave Theory and Techniques 56, no. 12 (December 2008): 3093–99. http://dx.doi.org/10.1109/tmtt.2008.2006807.

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Chi, Yu-Jen, and Fu-Chiarng Chen. "A novel quadri-polarization-agile microstrip antenna with polarization synthesizing feeding network." International Journal of Microwave and Wireless Technologies 8, no. 2 (March 26, 2015): 385–94. http://dx.doi.org/10.1017/s1759078715000227.

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This paper proposes planar antennas with quadri-polarization diversity using a pair of orthogonal linear polarizations and a pair of orthogonal circular polarizations (CP). A novel feeding network with four input ports and four output ports is presented, allowing antenna polarization diversity by selecting different input ports, which can generate right-handed CP, left-handed CP, horizontal linear polarization, and vertical linear polarization. The first design uses two square patch resonators to synthesize the four polarizations; the second design comprises four circularly polarized patches to synthesize the four polarizations with an improved axial-ratio (the ratio of orthogonal components of an E-field) bandwidth. The proposed designs do not require for embedding PIN diodes and DC-biasing circuits, making them suitable for use in higher-frequency applications where using lump elements would be difficult. The novel antennas provide potential polarization diversity features which can be used for many applications. Details of the antenna design are shown, and the measurement and simulation results are also provided to validate the proposed concept.
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Vorobiev, Andrei, and Spartak Gevorgian. "Enhanced tunable performance of high Q-factor BaxSr1−xTiO3 film bulk acoustic wave resonators." International Journal of Microwave and Wireless Technologies 5, no. 3 (April 15, 2013): 361–69. http://dx.doi.org/10.1017/s1759078713000317.

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Emerging intrinsically tunable film bulk acoustic wave(BAW) resonators allow the development of new generation reconfigurable and agile microwave circuits. In this paper, we demonstrate the enhancement of tunable performance of the high Q-factor BaxSr1−xTiO3 BAW – solidly mounted resonators (BAW–SMR) by varying Ba concentration. The Ba0.5Sr0.5TiO3 BAW–SMR reveal tunability of series resonance frequency up to 2.4%, electromechanical coupling coefficient up to 7.5% and rather high Q-factor, up to 250 at 5.3 GHz. Correlations between the measured electroacoustic parameters are analyzed using the theory of dc field-induced piezoelectric effect in paraelectric phase ferroelectrics. Higher coupling coefficient and tunability of resonance frequency of the Ba0.5Sr0.5TiO3 BAW–SMR are associated with higher tunability of permittivity. Strong anisotropy in field-induced piezoelectric effect is predicted with highest coupling coefficient in (001) direction of the BaxSr1−xTiO3 films. It is also shown that the tunability of series resonance frequency of Ba0.5Sr0.5TiO3 BAW–SMR is limited by relatively high and negative nonlinear electrostriction coefficient which is found to be m ≈ −4·1010 m/F. The BAW–SMR Q-factor is limited significantly by extrinsic acoustic loss associated with wave scattering at reflection from relatively rough top interface. The results of analysis show possible ways of further improvement of the performance of tunable BAW–SMR.
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Su, B., and T. W. Button. "The processing and properties of barium strontium titanate thick films for use in frequency agile microwave circuit applications." Journal of the European Ceramic Society 21, no. 15 (January 2001): 2641–45. http://dx.doi.org/10.1016/s0955-2219(01)00330-2.

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Liang, Jiaming, Yichuan Wu, Justin K. Yim, Huimin Chen, Zicong Miao, Hanxiao Liu, Ying Liu, et al. "Electrostatic footpads enable agile insect-scale soft robots with trajectory control." Science Robotics 6, no. 55 (June 30, 2021): eabe7906. http://dx.doi.org/10.1126/scirobotics.abe7906.

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Agility and trajectory control are two desirable features for robotics, but they become very challenging for soft robots without rigid structures to support rapid manipulations. Here, a curved piezoelectric thin film driven at its structural resonant frequency is used as the main body of an insect-scale soft robot for its fast translational movements, and two electrostatic footpads are used for its swift rotational motions. These two schemes are simultaneously executed during operations through a simple two-wire connection arrangement. A high relative centripetal acceleration of 28 body length per square second compared with existing robots is realized on a 65-milligram tethered prototype, which is better than those of common insects, including the cockroach. The trajectory manipulation demonstration is accomplished by navigating the robot to pass through a 120-centimeter-long track in a maze within 5.6 seconds. One potential application is presented by carrying a 180-milligram on-board sensor to record a gas concentration route map and to identify the location of the leakage source. The radically simplified analog motion adjustment technique enables the scale-up construction of a 240-milligram untethered robot. Equipped with a payload of 1660 milligrams to include the control circuit, a battery, and photoresistors, the untethered prototype can follow a designated, 27.9-centimeter-long “S”-shaped path in 36.9 seconds. These results validate key performance attributes in achieving both high mobility and agility to emulate living agile insects for the advancements of soft robots.
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Castañeda-Miranda, A., and L. D. L. Vizcaya. "A Novel System for Measuring Optical Properties in Arterial Blood of Man." Applied Bionics and Biomechanics 3, no. 2 (2006): 87–92. http://dx.doi.org/10.1155/2006/748520.

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The necessity of man–machine communication has been increasing day by day because of the great number of approaches that help to make human life agile or comfortable. Health is one of the aspects that has generated more interest in recent years. The optical technologies are new technical tools that are being implemented for medical diagnosis and for describing various processes occurring within human blood. These techniques have the virtue of being nondestructive; in addition they have the advantage of remote direction by using anin situtechnique, with sensitivity capable of studying the properties of the blood through electromagnetic excitation. A device to obtain the electromagnetic spectrum in the blood has being designed and is presented in this work. This device uses a quartz lamp, emitting electromagnetic radiation between 200 nm and 2200 nm. A model for measuring the light attenuation through the blood is used. By applying a control in the frequency domain, a circuit device is designed. This device uses a database in time domain for its subsequent analysis by Fast Fourier Transformation in order to obtain absorption spectra. The acquisition time is of the order of microseconds, and the system is controlled automatically through accessible software from a personal computer.
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Alzahrani, S., and T. S. Kalkur. "A Tunable Bandstop Filter Using Thin Film Barium-Strontium-Titanate Varactors." MRS Proceedings 1691 (2014). http://dx.doi.org/10.1557/opl.2014.745.

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AbstractFerroelectric barium-strontium-titanate (BST) varactors are becoming extremely important particularly for frequency-agile RF and microwave circuits. Tunable bandstop filters are desired to eliminate unwanted signals for several communication systems. In this paper, a compact tunable bandstop filter (BSF) based on a single hairpin resonator, using ferroelectric BST varactors, is also presented. The frequency response of proposed BSF can be adjusted by increasing or decreasing the length, width, and space for the coupled line hairpin resonator. One pair of variable capacitors has been incorporated to the filter for tuning and miniaturization purposes. The notch frequency of BSF can be tuned from 705 MHz to 1.035 GHz with a tuning voltage of 6 Volts utilizing BST varactors.
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Chang, W., J. S. Horwitz, J. M. Pond, S. W. Kirchoefer, and D. B. Chrisey. "Pulsed Laser Deposition of BaxSr1-xTiO3 Thin Films for Frequency Agile Microwave Electronics." MRS Proceedings 526 (1998). http://dx.doi.org/10.1557/proc-526-205.

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AbstractOriented, single phase thin films (~5000Å thick) of BaxSr1-xTiO3 (BST) have been deposited on to (100) MgO and LaAlO3 (LAO) single crystal substrates using pulsed laser deposition (PLD). A strong correlation is observed between the microstructure of the deposited film and the dielectric tuning and loss at microwave frequencies. Microstructural defects observed in as deposited films include strain, due to film substrate lattice mismatch and oxygen and cation vacancies. Compensation of the ablation target with excess Ba and Sr is observed to increase the dielectric constant and to reduce the dielectric loss. Post-deposition, bomb annealing of films at high temperatures (1250°C) is observed to fill oxygen vacancies and increase grain size. The difference in the dielectric behavior for as-deposited and low temperature annealed BST films on MgO and BST films on LAO is observed and may be attributed to the differences in film stress. A further improvement in the dielectric behavior is observed by the addition of donor/acceptor dopants such as Mn. The data shows that ferroelectric thin films can be used to build tunable microwave circuits that offer significant performance advantages over devices made from conventional semiconducting materials.
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"Design of Penta-Band Antenna for Concurrent Multiband Single Chain Radio Receiver." International Journal of Recent Technology and Engineering 8, no. 5 (January 30, 2020): 2587–90. http://dx.doi.org/10.35940/ijrte.e6387.018520.

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In this paper, penta-band antenna is presented for concurrent, multiband, and single chain radio receivers. The antenna is manufactured on a 50 × 100 mm FR4 printed circuit board, and is able to provide five concurrent, operating bands covering a frequency range from 2 to 6 GHz. The antenna bandwidth can be increased up to 280 MHz. Using hexahedral mesh the slot antenna design we can achieve more accurate concurrent bands. These five bands are having larger bandwidth than conventional antennas. Using CM-FARAD (Concurrent Multiband Frequency Agile Radio) architecture we design the antenna for achieving concurrent multiband and single chain radio receiver. Using five slots we achieve our five concurrent bands that operate over wide bands which operate at 2.4,3.0,3,7,4.5,5.6 GHz respectively.
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Dissertations / Theses on the topic "Frequency Agile Circuits"

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Fardin, Ernest Anthony, and efardin@ieee org. "Barium Strontium Titanate Thin Films for Tunable Microwave Applications." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080104.135507.

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There has been unprecedented growth in wireless technologies in recent years; wireless devices such as cellular telephones and wireless local area network (WLAN) transceivers are becoming ubiquitous. It is now common for a single hardware device, such as a cellular telephone, to be capable of multi-band operation. Implementing a dedicated radio frequency (RF) front-end for each frequency band increases the component count and therefore the cost of the device. Consequently, there is now a requirement to design RF and microwave circuits that can be reconfigured to operate at different frequency bands, as opposed to switching between several fixed-frequency circuits. Barium strontium titanate (BST) thin films show great promise for application in reconfigurable microwave circuits. The material has a high dielectric constant which can be controlled by the application of a quasi-static electric field, combined with relatively low losses at microwave frequencies. Tunable microwave components based on BST-thin films have the potential to replace several fixed components, thereby achieving useful size and cost reductions. This thesis is concerned with the growth and microwave circuit applications of BST thin films on c- and r-plane sapphire substrates. Sapphire is an ideal substrate for microwave integrated circuit fabrication due to its low cost and low loss. Electronically tunable capacitors (varactors) were fabricated by patterning interdigital electrode structures on top of the BST films. High capacitance tunabilities of 56% and 64% were achieved for the films grown on c-plane and r-plane sapphire, respectively, at 40 V bias. A novel electronically tunable 3 dB quadrature hybrid circuit was also developed. Prototypes of this circuit were initially implemented using commercial varactor diodes, in order to validate the design. An integrated version of the coupler was then fabricated using BST varactors on c-plane sapphire. The results achieved demonstrate the potential of sapphire-based BST thin films in practical microwave circuits.
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Jin, Zhang. "Frequency agile RF/microwave circuits using BST varactors." 2003. http://www.lib.ncsu.edu/theses/available/etd-12162003-160350/unrestricted/etd.pdf.

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Vasani, Anand Jitendra. "Design of frequency agile circuits using barium strontium titanate varactor." 2006. http://www.lib.ncsu.edu/theses/available/etd-07062006-180512/unrestricted/etd.pdf.

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Chiu, Shih-Chia, and 邱詩家. "Dual-Band and Frequency-Agile, Compact Composite Right/Left-Handed Transmission Line Antennas Using Novel Termination Circuits." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/38013632361488129934.

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博士<br>國立臺灣大學<br>電信工程學研究所<br>101<br>Two resonant-type composite right/left-handed transmission line (CRLH TL) antennas terminated with novel termination circuits are proposed in the dissertation for dual-band and frequency-tunable operations, respectively. First, for dual-band operation, the transmission line approach and equivalent circuit model are used to analyze the characteristics of the CRLH TLs and justify the absence of one of the two zeroth-order resonances in conventional unbalanced CRLH TL resonators using open or short terminations. Then, according to the termination effects and resonant behaviors, a series of termination circuits for unbalanced CRLH TLs are proposed to enable simultaneous excitation of the zeroth-order series and shunt resonances. The proposed termination circuits are very simple and consist merely of a capacitor or inductor in series/parallel with a parallel/series LC tank. Unlike conventional dual- or multi-band zeroth-order resonator (ZOR) antennas formed by open- or short-ended CRLH TLs, in which only one of the zeroth-order resonances can be excited, the proposed ZOR antennas can operate simultaneously at the zeroth-order series and shunt resonances when the proposed termination circuits are applied. Also, it is demonstrated that the proposed antennas have similar input impedance responses, radiation patterns, and peak gains within the two operating bands. Secondly, for frequency agility, it is shown that a capacitor as the termination for a CRLH TL is needed for excitation of the anti-resonance within the band-gap region. It is also shown that the resonant frequency will vary with the termination capacitance. Therefore, by utilizing a varactor diode as the termination, the termination capacitance can be controlled by changing its bias voltage, and the resonance of the antenna can thus be tuned within its band-gap region. For verification, a prototype antenna based on the asymmetric coplanar strip configuration was fabricated and tested. It has a continuously tunable resonant frequency between 2.15 GHz and 2.8 GHz as the bias voltage is adjusted in between 4 V and 22 V. When tuned to resonate at different frequencies in the band gap, the antenna still exhibits similar radiation pattern and stable peak gain and radiation efficiency owing to the same resonant mechanism in the band gap. In the dissertation, design formulas to estimate the element values of the termination circuits for given frequencies are derived, and some design considerations are discussed as well. Both of the proposed antennas have satisfactory radiation performances and a compact size and are therefore suitable for wireless communication applications.
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Lourandakis, Errikos [Verfasser]. "Frequency agile microwave circuits based on ferroelectric thin-film varactors = Frequenzagile Mikrowellenschaltungen auf der Basis ferroelektrischer Dünnfilm-Varaktoren / vorgelegt von Errikos Lourandakis." 2009. http://d-nb.info/994002300/34.

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Hsu, Siang-Rong, and 許向榮. "Circuit Modeling of Varactor for Frequency-Agile Microwave Circuit Design." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/90866660483748889769.

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碩士<br>元智大學<br>通訊工程學系<br>104<br>The thesis proposes a quasi-lumped equivalent circuit of the varactor diode manufactured by Skyworks Inc., and the proposed model predicts an accurate response for wideband applications. Based on the manufacture's pure lumped equivalent circuit model, a lossy transmission line section, i.e. a distributed structure, is introduced to describe packaging parasitic effects and enhance accuracy of the device characteristics. The circuit parameters are retrieved by curve-fitting the measured scattering parameters of the varactor. Besides, the quality factor of the varactor diode can be extracted from simulated scattering parameters of the device model for analyzing varactor loss under different reverse biases. The model validation is carried out by an experimental verification with a varactor-based microstrip tunable bandstop filter and good agreement is observed between the simulated and measured results. Therefore, the proposed model can be used for characterizing varactor-based frequency agile RF circuits with a high accuracy.
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Conference papers on the topic "Frequency Agile Circuits"

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Kaehlert, Stefan, Dirk Bormann, Tobias D. Werth, Muh-Dey Wei, Lei Liao, and Stefan Heinen. "Design of frequency agile filters in RF frontend circuits." In 2012 IEEE Radio and Wireless Symposium (RWS). IEEE, 2012. http://dx.doi.org/10.1109/rws.2012.6175361.

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Ding, Xin, Jianhui Wu, and Chao Chen. "An Agile Automatic Frequency Calibration Technique for PLL." In 2018 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA). IEEE, 2018. http://dx.doi.org/10.1109/cicta.2018.8706068.

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Preis, Sebastian, Alex Wiens, Nikolai Wolff, Rolf Jakoby, Wolfgang Heinrich, and Olof Bengtsson. "Frequency-agile packaged GaN-HEMT using MIM thickfilm BST varactors." In 2015 10th European Microwave Integrated Circuits Conference (EuMIC). IEEE, 2015. http://dx.doi.org/10.1109/eumic.2015.7345164.

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Milevsky, Borislav, Myriam Ariaudo, Jean-Luc Gautier, and Marin Hristov. "Design of an agile frequency synthesizer for UWB communications." In 2011 IEEE 9th International New Circuits and Systems Conference (NEWCAS 2011). IEEE, 2011. http://dx.doi.org/10.1109/newcas.2011.5981283.

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Goswami, Sushmit, Helen Kim, and Joel L. Dawson. "A frequency-agile RF frontend for multi-band TDD radios in 45nm SOI CMOS." In 2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC). IEEE, 2013. http://dx.doi.org/10.1109/rfic.2013.6569596.

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Xin Xu, Xiaohong Tang, and Tao Wu. "A DDS-based C-band wideband agile frequency synthesizer." In 2013 International Workshop on Microwave and Millimeter Wave Circuits and System Technology (MMWCST). IEEE, 2013. http://dx.doi.org/10.1109/mmwcst.2013.6814643.

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Cetinoneri, Berke, Yusuf A. Atesal, and Gabriel M. Rebeiz. "A two-channel Ku-band BiCMOS digital beam-forming receiver for polarization-agile phased-array applications." In 2009 IEEE Radio Frequency Integrated Circuits Symposium (RFIC). IEEE, 2009. http://dx.doi.org/10.1109/rfic.2009.5135505.

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Schmidt, Martin, Markus Grozing, Stefan Heck, Ingo Dettmann, Manfred Berroth, Dirk Wiegner, Wolfgang Templ, and Andreas Pascht. "A 1.55 GHz to 2.45 GHz center frequency continuous-time bandpass delta-sigma modulator for frequency agile transmitters." In 2009 IEEE Radio Frequency Integrated Circuits Symposium (RFIC). IEEE, 2009. http://dx.doi.org/10.1109/rfic.2009.5135511.

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Zhang, Frank, Ranjit Gharpurey, and Peter Kinget. "A 3.1–9.5 GHz agile UWB pulse radio receiver with discrete-time wideband-IF correlation in 90nm CMOS." In 2008 IEEE Radio Frequency Integrated Circuits Symposium (RFIC). IEEE, 2008. http://dx.doi.org/10.1109/rfic.2008.4561379.

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Kaehlert, Stefan, Dirk Bormann, Tobias D. Werth, Muh-Dey Wei, Lei Liao, and Stefan Heinen. "A frequency agile LNA for cognitive radio applications in the UHF band." In 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2011. http://dx.doi.org/10.1109/mwscas.2011.6026432.

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