Wideband Electronically Tunable Filters for Vhf-uhf Band PDF Download
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Author: George H. THIESS
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Book Description
Measurements of linewidth and Q have been made at frequencies from 90 Mc to 1000 Mc on 40 gallium substituted YIG resonators. Both spheres and discs were measured by a dynamic technique in which a resonator coupled energy between two coaxial lines. A complete description of the experimental setup is given and the data obtained is analyzed. The measured Q of gallium substituted YIG was found to be too low for practical filters at frequencies below 200 Mc at all temperatures from room temperature up to the curie temperature of the resonator. It is also predicted, from theoretical considerations, that at no other temperature higher than 10 K, is the Q likely to be any higher. It is recommended that further development of low magnetization materials be carried out, with the special aim of producing materials free of gradients and with low cutoff frequencies. The insertion loss of the UHF filter was typically 3 to 4 db across the 300 Mc to 1000 Mc band. The VHF filter was approximately 4 db except at 90 Mc where it rose to 11.5 db. It is concluded that YIG filters are probably not practical at frequencies below 200 Mc unless improved materials become available. (Author).
Author: George H. THIESS
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Book Description
Measurements of linewidth and Q have been made at frequencies from 90 Mc to 1000 Mc on 40 gallium substituted YIG resonators. Both spheres and discs were measured by a dynamic technique in which a resonator coupled energy between two coaxial lines. A complete description of the experimental setup is given and the data obtained is analyzed. The measured Q of gallium substituted YIG was found to be too low for practical filters at frequencies below 200 Mc at all temperatures from room temperature up to the curie temperature of the resonator. It is also predicted, from theoretical considerations, that at no other temperature higher than 10 K, is the Q likely to be any higher. It is recommended that further development of low magnetization materials be carried out, with the special aim of producing materials free of gradients and with low cutoff frequencies. The insertion loss of the UHF filter was typically 3 to 4 db across the 300 Mc to 1000 Mc band. The VHF filter was approximately 4 db except at 90 Mc where it rose to 11.5 db. It is concluded that YIG filters are probably not practical at frequencies below 200 Mc unless improved materials become available. (Author).
Author: A. W. Shaw
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Work in the area of electrically tunable filters using YIG and GaYIG resonators is reported. Ten filters which were delivered are described. Most of these filters are nonreciprocal. Filter design, temperature compensation, linearity and hysteresis, and magnetic shielding are discussed. (Author).
Author: A. W. Shaw
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Work in the area of electrically tunable filters using YIG and GaYIG resonators is reported. Ten filters which were delivered are described. Most of these filters are nonreciprocal. Filter design, temperature compensation, linearity and hysteresis, and magnetic shielding are discussed. (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 760
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Category : Aeronautics
Languages : en
Pages : 464
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 980
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Author: Yongshik Lee
Publisher:
ISBN:
Category : Microelectromechanical systems
Languages : en
Pages : 46
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Author: Andrei Grebennikov
Publisher: John Wiley & Sons
ISBN: 9780470512081
Category : Technology & Engineering
Languages : en
Pages : 458
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Book Description
The increase of consumer electronics and communications applications using Radio Frequency (RF) and microwave circuits has implications for oscillator design. Applications working at higher frequencies and using novel technologies have led to a demand for more robust circuits with higher performance and functionality, but decreased costs, size and power consumption. As a result, there is also a need for more efficient oscillators. This book presents up to date information on all aspects of oscillator design, enabling a selection of the best oscillator topologies with optimized noise reduction and electrical performance. RF and Microwave Transistor Oscillator Design covers: analyses of non-linear circuit design methods including spectral-domain analysis, time-domain analysis and the quasilinear method; information on noise in oscillators including chapters on varactor and oscillator frequency tuning, CMOS voltage-controlled oscillators and wideband voltage-controlled oscillators; information on the stability of oscillations, with discussions on the stability of multi-resonant circuits and the phase plane method; optimized design and circuit techniques, beginning with the empirical and analytic design approaches, moving on to the high-efficiency design technique; general operation and design principles of oscillators, including a section on the historical aspects of oscillator configurations. A valuable reference for practising RF and Microwave designers and engineers, RF and Microwave Transistor Oscillator Design is also useful for lecturers, advanced students and research and design (R&D) personnel.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 1416
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Book Description
Author: Arthur Karp
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Book Description
A novel, high-Q, high-power VHF/UHF bandpass filter is described that is electronically tuned according to a binary logic. A high-Q, TEM-line resonator is distributively loaded with N independent capacitive irises, such that the opening and closing of switches within each iris makes its capacitance two-valued. Mathematical modeling and design relations were developed and a working, 512-channel (9 iris) bandpass filter was completed for the range 194 to 359MHz.
