Field‐Strength Measurements in a Multipath Field Using Linear and Circular Probing

Mittra, R.; Stearns, Charles O.

doi:10.1002/rds196721101

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…If there are serious local nonhomogeneities, or discontinuities in the electrical properties of the ground (E, and o), the freespace relationship between total E and total H does not hold. The same will be true if measurements are made in a multipath field [18] resulting from any type of reflection. Likewise, measurements made with such an instrument in the near field of a transmitting antenna ( d s n ) will be of questionable value.…”

Section: Use Of Loop-type Field-strength Metersmentioning

confidence: 85%

NBS field-strength standards and measurements (30 Hz to 1000 MHz)

Greene

1967

Proc. IEEE

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A descriptio0 is given of the CW t"ms@h stamla& and essociptedmepsrwment' ' tationdteceairleeqdforthecnlibmt i o a o f b o t h c o m m e r c i n l d m i l i t u y f i e l d-s t r e o g t h~m v~f r eq w o c y~o f t h e o v~r r n g e~3 0 H z t o l O O O M H z , r r h i e h b s v e~ developedattheNa~WlreraofSt.nQrdsdPriagthepPst25to30yePrs '2be techaiqws are rppliaMe only for evaluating the streegth ofsteady4ate, a c f i e l d s v a r y h g~m t i m e , a n d a r e. o t~f o r p s e~l w o a dband appiicatbm of any kind. Twopri&paltypesofWdrengthstmdar&dapdotypenear-zone 6eId-&engtb meter are described: 1) umgne&&M4rm@b s t d a d s (30 Hz to 30 MHz), 2) e l &-6 e h l e e m g t h st.adnrdf (3 0 to lo00 MHz), and 3) near-zooe electric-fidd-strength meter a d interim kkl-streogth stamhrds (150 kHz to 30 MHz).

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Section: Use Of Loop-type Field-strength Metersmentioning

confidence: 85%

NBS field-strength standards and measurements (30 Hz to 1000 MHz)

Greene

1967

Proc. IEEE

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“…This is of particular importance in the consideration of log-periodic antennas and will be given more thorough consideration in subsequent work. In particular, separation of complex nearfield data into exponential terms is possible [12] and this should lead to more complete and more accurate k-/3 plots. The potentialities of a certain periodic structure as a frequency-independent antenna are in some measure dependent upon the amplitude distribution of element currents as well as the phasing.…”

Section: Measurementsmentioning

confidence: 99%

“…I t should be noted that the backfire phasing was achieved in the log-periodic dipole array by use of a transposed feeder [12]. A companion project has involved measurement of k-P diagrams for the periodic dipole array [3].…”

Section: Brilloztin Diagrams F O R Periodic Counterparts Of Frequencymentioning

confidence: 99%

Near-field investigation of uniform periodic monopole arrays

Hudock

Mayes

1965

IEEE Trans. Antennas Propagat.

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Absfracf-Measurements of amplitude and phase of the fields close to a number of driven periodic arrays of monopoles have been made to determine frequency dependence of the propagation constant for such structures. The results have been analyzed, where possible, in terms of a single traveling wave along the structure, and dispersion curves are given which include attenuation as well as phase shift. These curves clearly illustrate the possibility of obtaining leading phase shift along the periodic structure that w i l l produce backfire radiation. Experimental radiation patterns corroborate the near-field results.A simple theory is given for the backfire phasing in terms of the space-harmonic content of a Fourier series expansion for the fields of penodic structures. This theory predicts beam scanning for the periodic structures which is readily observed in the experimental models. The measured data are approximately applicable to tapered versions of the periodic structures which have log-periodic geometry. Examples of periodic structures that have frequency independent log-periodic counterparts as well as some that do not are discussed.work was conducted under the sponsorship of the U. S.

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