Home
>
Journals & magazines
>
IEE Proceedings - Microwaves, Antennas and Propag...
>
Volume 145
Issue 5
IEE Proceedings - Microwaves, Antennas and Propagation
Volume 145, Issue 5, October 1998
Volumes & issues:
Volume 145, Issue 5
October 1998
-
- Author(s): O.M. Bucci ; C. Gennarelli ; G. Riccio ; C. Savarese
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 369 –374
- DOI: 10.1049/ip-map:19982248
- Type: Article
- + Show details - Hide details
-
p.
369
–374
(6)
A sampling representation, particularly suitable for dealing with elongated antennas, is proposed for fast and accurate interpolation of the electromagnetic field radiated on a cylinder in the near field region and properly exploited to develop a new near field–far field transformation technique with cylindrical scanning. The technique relies on recent theoretical results concerning the nonredundant representation of radiated or scattered fields, and allows one to evaluate the antenna far field from minimal near field data. In particular, the proposed technique allows one to reduce significantly the amount of data needed, without losing the numerical efficiency of previous approaches. As a consequence, measurement time and memory storage requirements are reduced remarkably. Numerical tests confirm the effectiveness and stability of the proposed approach. - Author(s): S.R. Davies and L.T. Little
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 375 –378
- DOI: 10.1049/ip-map:19982251
- Type: Article
- + Show details - Hide details
-
p.
375
–378
(4)
A receiver noise temperature of 61 K (DSB) has been measured for a superconductor–insulator–superconductor (SIS) heterodyne receiver operating at 232 GHz, the lowest value reported to date for such a receiver employing a lead alloy junction. Analysis of the losses of the receiver components yields mixer noise temperature and conversion loss, Tm = 24 K and Lm = 2.1 dB (DSB). These are compared with predictions based on 3-port quantum mixer theory, made using the measured characteristics of the junction and an equivalent circuit for the waveguide mixer mount deduced from scaled modelling experiments. - Author(s): E.M. Warrington
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 379 –385
- DOI: 10.1049/ip-map:19982068
- Type: Article
- + Show details - Hide details
-
p.
379
–385
(7)
The author presents measurements of the directional characteristics of the Doppler and time delay components of a pulsed channel sounding signal received over two high latitude paths. A variation in bearing with Doppler frequency was frequently evident, an effect attributed to Doppler shifts imposed on the signal when scattered from ionospheric irregularities drifting across the reflection points. For a transauroral path, for which the ionospheric reflection points were subauroral, standard deviations of up to ~ 2.5° were observed in the azimuthal power distribution of the received energy. Much greater disturbances with azimuthal standard deviations of up to ~35° were recorded on signals received over a path contained entirely within the polar cap path. - Author(s): S. Barraud ; J.L. Dubard ; D. Pompéi
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 387 –391
- DOI: 10.1049/ip-map:19982249
- Type: Article
- + Show details - Hide details
-
p.
387
–391
(5)
An approach using the 3D-TLM inverse process is proposed to make pattern recognitions for conducting elements. To obtain accurate results, the spatial discretisation methods used need the simulation of an infinite propagation space. To control the effects of boundary conditions on the inverse simulation, two approaches are proposed for the quantitative reconstruction of objects in three-dimensional free space. However, the results obtained from the inverse process can be multiple, especially if the inverse method is the same as the direct method. This inverse crime problem is considered in the paper. - Author(s): G. Biffi Gentili and C. Salvador
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 392 –396
- DOI: 10.1049/ip-map:19982065
- Type: Article
- + Show details - Hide details
-
p.
392
–396
(5)
A serially fed linear array of patches with polarisation agility capability is proposed. The basic element of the array is a cross-shaped patch, coupled to a pair of parallel microstrip feeding lines through two orthogonal slots etched in the ground plane. The array design was carried out by combining an image parameter based network synthesis method with the full-wave analysis of the isolated basic element. A full-wave analysis of the whole array was then accomplished to determine its radiating properties and to validate the proposed synthesis method. - Author(s): Y. Gong ; W. Wang ; Y. Wei ; S. Liu
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 397 –405
- DOI: 10.1049/ip-map:19982062
- Type: Article
- + Show details - Hide details
-
p.
397
–405
(9)
The dispersion equation and interaction impedance of the ridge-loaded ring-plane slow-wave structure are obtained, by application of the Ritz–Galerkin method. Numerical results are given in terms of k – vp curves and impedance diagrams. The influence of several geometrical dimensions on the dispersion characteristic and interaction impedance are discussed. This kind of slow-wave circuit can operate at a high power level over a relatively wide microwave-frequency range. To get higher power and broader bandwidth for this circuit the optimum opening angle and a smaller radius of the loaded ridge must be chosen. The paper provides the theoretical basis for designing this type of slow-wave circuit for high-power travelling-wave tubes. - Author(s): A. Stanley and E.A. Parker
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 406 –410
- DOI: 10.1049/ip-map:19982245
- Type: Article
- + Show details - Hide details
-
p.
406
–410
(5)
Compared with computing the forward radiation patterns, modelling fields backscattered from a curved dichroic surface enclosing an antenna using ray tracing, introduces further levels of path complexity between source and field points. A paraboloidal radome, with an FSS array symmetrically embedded in the dielectric wall, is used as an illustration of the influence that the relative source/field point locations have on the path multiplicity and on the sequence of high order backscattered ray paths. Results are presented for a ring slot FSS enclosing a waveguide horn, including field distributions and power backscattered into the antenna. - Author(s): A.D. Chuprin ; E.A. Parker ; A.D. Shatrov ; A.N. Sivov ; V.S. Solosin ; A.S. Zubov ; R.J. Langley
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 411 –415
- DOI: 10.1049/ip-map:19982244
- Type: Article
- + Show details - Hide details
-
p.
411
–415
(5)
A theoretical and experimental study of the phase characteristics of thick conducting gratings is presented. The frequency and angular behaviour of the reflection coefficient phase is investigated. Depending on the cross-section of the conductors, the grating periodicity can be chosen such that, over a wide frequency range, the phase of the reflection and transmission coefficients remains constant. Angular dependence of the reflection and transmission coefficients for these gratings also disappears within this frequency range. The phenomenon occurs only for the case with the electric vector parallel to the grating conductors. - Author(s): L. Economou and R.J. Langley
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 416 –420
- DOI: 10.1049/ip-map:19982250
- Type: Article
- + Show details - Hide details
-
p.
416
–420
(5)
The performance of circular patch antennas attached to a laminated automotive windscreen is described. Experimental work and results computed from a spectral domain analysis investigate the input impedance, radiation patterns, and the effect of surface wave propagation within the glass. The overall efficiencies of several combinations of substrates and superstrates are presented. Variations in the dimensions of the laminate are discussed as they have a significant effect on patch performance. - Author(s): W. Zieniutycz
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 421 –423
- DOI: 10.1049/ip-map:19982063
- Type: Article
- + Show details - Hide details
-
p.
421
–423
(3)
The design of rectangular microstrip antennas (RMA) is presented. The resonant frequency of a rectangular microstrip antenna is found as the frequency for which the current corresponding to a single hybrid radiation mode of microstrip line reaches maximum value. The finite transversal dimension of the antenna is taken into account by introducing a correcting term that depends on the effective dielectric constant of an equivalent microstrip line. Numerical results confirming the accuracy of the approach (error < 1% for thin substrates) are presented. An application example of the method for studying mutual coupling between antennas is also shown. Limitations and prospects for the future of the method are discussed. - Author(s): G. d'Ambrosio and M.D. Migliore
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 424 –426
- DOI: 10.1049/ip-map:19982246
- Type: Article
- + Show details - Hide details
-
p.
424
–426
(3)
A slotted rectangular waveguide and a channel guide antenna are considered. It is theoretically and experimentally shown that two leaky-waves must be taken into account for the far field evaluation. It is also shown that the main lobe of the radiation pattern of the channel guide antenna is due to a complex mode other than that found as a perturbative solution. - Author(s): N. Nikolic and J.S. Kot
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 427 –429
- DOI: 10.1049/ip-map:19982066
- Type: Article
- + Show details - Hide details
-
p.
427
–429
(3)
The problem of mutual coupling in a coaxial array of annular-slot antennas is formulated in terms of a magnetic-field integral equation (MFIE). The MFIE is solved numerically, under the assumption of narrow slot width, using a moment method with a Fourier basis and point matching. The operation of the array under multiport excitation is analysed, and an impedance matrix representation of the multiport antenna is calculated. Results predicted by the theory are shown to be in good agreement with experimental measurements on a two-port, two-element coaxial annular-slot array. - Author(s): R. Jin ; J. Hirokawa ; M. Ando
- Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 145, Issue 5, p. 430 –432
- DOI: 10.1049/ip-map:19982247
- Type: Article
- + Show details - Hide details
-
p.
430
–432
(3)
An accelerant method is proposed to calculate Green's function for a horizontal dipole in a parallel plate waveguide. The expression in the spatial domain is simple and easily coded. It is advantageous in a wide frequency range and for a larger ratio of distance over height. For a small ratio of distance over height, the computing efficiency is comparable with the complex image method without the need for complex mathematical pretreatment.
NF–FF transformation with cylindrical scanning: an effective technique for elongated antennas
Low noise SIS receiver performance using Pb alloy tunnel junctions
Observations of the directional characteristics of ionospherically propagated HF radio channel sounding signals over two high latitude paths
3D-TLM pattern recognitions in free space
New serially fed polarisation-agile linear array of patches
Theoretical analysis of ridge-loaded ring-plane slow wave structure by variational methods
Ray tracing fields backscattered from curved dichroic structures
Phase characteristics of thick metal gratings
Circular microstrip patch antennas on glass for vehicle applications
Application of hybrid radiation modes of a microstrip line in the design of rectangular microstrip antennas
Nonideal radiation pattern of simple leaky-wave antennas explained in terms of free resonant modes
Analysis of mutual coupling in a cavity-backed coaxial array of annular-slot antennas
Accelerant method for Green's function of horizontal dipole in parallel plate waveguide
Most viewed content for this Journal
Article
content/journals/ip-map
Journal
5
Most cited content for this Journal
We currently have no most cited data available for this content.