radio frequency and microwave communication circuits

... modulation frequency. Hence, a radio receiver must be able to accommo- date the bandwidth of a signal. 7 1.3.2 Frequency modulation (FM) Frequency modulation is the modulation method used in VHF radio ... frequency bandwidth required for wideband FM is approx- imately 2 × (maximum frequency deviation + highest frequency present in the message signal) or bw = 2 [∆f c + f m (max)...

Ngày tải lên: 18/04/2014, 12:24

Ngày tải lên: 25/12/2013, 10:44

... the MHW5185. Because linear (and power) modules have inputs and outputs that are matched to standard system impedances (75 ⍀ for CATV amplifiers and 50 ⍀ for power amplifiers), test circuits and fixtures are ... transistor gets larger and larger (higher and higher power), and is designed to operate at higher and higher frequencies, the result is a continual decrease in the input...

Ngày tải lên: 18/04/2014, 12:26

... orders@intechweb.org Advanced Radio Frequency Identification Design and Applications, Edited by Stevan Preradović p. cm. ISBN 978-953-307-168-8 ADVANCED RADIO FREQUENCY IDENTIFICATION DESIGN AND APPLICATIONS Edited ... focuses on new and advanced applications of radio frequency identifi cation. The second section starts with one of the most common ap- plications of RF...

Ngày tải lên: 19/06/2014, 23:20

... behind the tag antenna and the reader antenna 24 Advanced Radio Frequency Identification Design and Applications the tag in each location on the wine bottle is tested and the optimum location ... section of UHF and microwave passive RFID transponders. IEEE Transactions on Microwave Theory and Techniques, Vol. 53, No. 9, pp. 2978–2990, Sept. 2005. [6] Dobkin, D. & Weigand...

Ngày tải lên: 19/06/2014, 23:20

... of the fabricated fractal loop antenna. Advanced Radio Frequency Identification Design and Applications 42 (a) Frequency (MHz) (b) Frequency (MHz) Fig. 20. Measured RL for the fabricated ... G r P' r and can be expressed as given in equation (1) by considering the tag antenna gain G t and the tag- reader path loss (Salama, 2010): Advanced Radio Frequen...

Ngày tải lên: 19/06/2014, 23:20

... Advanced Radio Frequency Identification Design and Applications 52 it operates in the ISM bands (Industrial Scientific and Medical), free bands. Many others systems, operating in that band, ... interest in RFID systems and its applications. Operating frequencies including 125 KHz–134 KHz and 140 KHz–148.5 KHz LF band, 13.56 MHz HF band and 868 MHz–960 MHz UHF band were ap...

Ngày tải lên: 19/06/2014, 23:20

... (3.15) To clarify the frequency dependence, we divide the numerator and denominator of Eq. (3.15) by λ 2 and obtain Advanced Radio Frequency Identification Design and Applications 74 ... parameters (N, D, and H) is explained by taking into account Eq. (3.6). The relation between X L and H is determined on the basis of Advanced Radio Frequency Identification Des...

Ngày tải lên: 19/06/2014, 23:20

... thickness is T, and the size of the metal plate is M. The spacing between the antenna and the metal plate is S. The equivalent electric and magnetic currents are I and J, respectively. E θ and E φ ... simulation and measurement. An Advanced Radio Frequency Identification Design and Applications 98 22422 4 () 2 rA r A T T M MRL L ωω α ±− ±= (4.6) We label these...

Ngày tải lên: 19/06/2014, 23:20

... except the ring slots take a meander route between ports a and b and not a circular route as in the OCSRR particle. This meander route results in a much lower resonant frequency for over all dimensions ... Whinnery and Theodore Van Duzer, FIELDS AND WAVES IN COMMUNICATION ELECTRONICS – Third Edition, JOHN WILEY&SONS, INC., pp.189-193, 1993 [18] W. L. Stutzman and G. A. Th...

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