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Author: J. Leon Poirier Publisher: ISBN: Category : Antenna radiation patterns Languages : en Pages : 82
Book Description
A Trailblazer II rocket was launched on 18 June 1967 from the NASA wallops Island (Va.) Rocket Test Facility to study the properties of the reentry plasma sheath and its effects on microwave antenna performance. The reentry payload consisted of three major subsystems: a plasma diagnostic system, an S- band transponder system, and an X-band telemetry system. The flight data yielded (1) measurements of the influence of the plasma on the radiation pattern distortion, signal attenuation, and impedance mismatch for an S-band slot antenna located at the stagnation point of the nose cone; (2) measurements of the plasma sheath effects on the interantenna coupling between two S-band antennas on the nose cone; and (3) determinations of the electron density profile and gradients in the boundary layer about the nose cone.
Author: J. Leon Poirier Publisher: ISBN: Category : Antenna radiation patterns Languages : en Pages : 82
Book Description
A Trailblazer II rocket was launched on 18 June 1967 from the NASA wallops Island (Va.) Rocket Test Facility to study the properties of the reentry plasma sheath and its effects on microwave antenna performance. The reentry payload consisted of three major subsystems: a plasma diagnostic system, an S- band transponder system, and an X-band telemetry system. The flight data yielded (1) measurements of the influence of the plasma on the radiation pattern distortion, signal attenuation, and impedance mismatch for an S-band slot antenna located at the stagnation point of the nose cone; (2) measurements of the plasma sheath effects on the interantenna coupling between two S-band antennas on the nose cone; and (3) determinations of the electron density profile and gradients in the boundary layer about the nose cone.
Author: Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
The Final Report under Contract AF19(628)-3834, summarizes the work carried out during the period 1 January 1964-31 March 1967 in the Engineering Experiment Station, The University of Arizona. The work covers experimental and theoretical investigations into the problem of plasma sheath effects on antennas. In the area of experimental investigations, the effects of plasma sheath homogeneities and nonuniformities on the radiation pattern and input impedance were assessed. In the area of theoretical investigations, the effects of the structure curvature and the radiation patterns were assessed. The effect of plasma compressibility was also investigated.
Author: Publisher: ISBN: Category : Languages : en Pages : 43
Book Description
A plasma simulation technique was developed which can be used to study the effects of homogeneous or inhomogeneous plasma sheath on the radiation pattern deterioration and input impedance of microwave antennas. A tank was designed and constructed for use in the simulation technique which can reproduce by means of real dielectric materials the dielectric constant encountered in plasma covered antenna research. The radiation patterns and the input impedances of an annular slot and a thin and long rectangular slot have been successfully measured in the presence of a simulated loss-less, homogeneous and isotropic plasma layer of varied thickness. Comparison with the available theoretical data indicates a generally good agreement, although some differences exist. In the case of the radiation patterns these differences are attributed to the finite distance between the radiator and the receiving antenna on one hand and the inherent inaccuracy of the saddle point method of integration in certain regions on the other hand.
Author: Stanton Jerrold Peale Publisher: ISBN: Category : Antennas (Electronics) Languages : en Pages : 154
Book Description
In recent years there has been a growing interest in general plasma physics. Communications over long distances are affected by plasma clouds and any magnetic fields they contain. While radio sounding is currently used to explore the ionosphere, investigation of plasmas located at points far beyond the ionosphere demands that environmental sampling techniques be developed to produce reliable knowledge.
Author: Publisher: ISBN: Category : Languages : en Pages : 44
Book Description
The plasma sheath simulation technique developed earlier was use to investigate the effects of various types of sheath discontinuities and inhomogenities on a slot antenna radiation pattern and input impedance. In the case of semi-infinite and finite-extent homogeneous plasma sheaths, the radiation pattern and the impedance characteristic are investigated with regard to the geometry of the discontinuity and its proximity to the slot antenna. It is found that the radiation pattern is unaffected by the discontinuity as long as the ratio of the distance between the source and the discontinuity to the sheath thickness is of the order of 20 or greater. When the sheath is made finite in extent, with a discontinuity on each side of the slot, the resulting pattern is seen to be a superposition of the effects of each discontinuity acting separately. The effects produced by inhomogeneities are found to be similar to those of a homogeneous sheath with a certain equivalent dielectric constant. For both the homogeneous and inhomogeneous sheaths, favorable comparison with the available theory is obtained.
Author: Nicholas V. Karas Publisher: ISBN: Category : Antenna radiation patterns Languages : en Pages : 36
Book Description
The effect of a plasma on the radiation characteristics of slot and gap apertures located on structures such as cylinders and cones has been studied by means of a plasma simulation technique. The relative index of refraction of less than unity between plasma and free space was maintained for the model by an analog tank that represented free space by a high dielectric constant liquid and the plasma by a lower dielectric material. This technique differs from a previous simulation method in that the models can be immersed into the tank, rather than being kept external. This modification allows the study of nonplanar geometries of complex shapes. Antenna patterns of axial slots on cylinders of various radii and thicknesses of plasma covering were observed to have good agreement with theory for radiation in the equatorial plane, as did the antenna patterns for a plasma-covered center-fed cylindrical antenna. Experimental patterns of a slot on a cylinder partially covered by a plasma are presented. Various effects of the plasma on the radiation characteristics of the slot were observed by varying the location of the plasma on the cylinder in relation to the slot and by varying the amount of surface area covered by the plasma. Experimental patterns of slots on cones covered by a plasma are also presented. (Author).
Author: J. Leon Poirier Publisher: ISBN: Category : Antenna radiation patterns Languages : en Pages : 0
Book Description
A Trailblazer II rocket was launched on 18 June 1967 from the NASA wallops Island (Va.) Rocket Test Facility to study the properties of the reentry plasma sheath and its effects on microwave antenna performance. The reentry payload consisted of three major subsystems: a plasma diagnostic system, an S- band transponder system, and an X-band telemetry system. The flight data yielded (1) measurements of the influence of the plasma on the radiation pattern distortion, signal attenuation, and impedance mismatch for an S-band slot antenna located at the stagnation point of the nose cone; (2) measurements of the plasma sheath effects on the interantenna coupling between two S-band antennas on the nose cone; and (3) determinations of the electron density profile and gradients in the boundary layer about the nose cone.
Author: Publisher: ISBN: Category : Languages : en Pages : 75
Book Description
A Trailblazer II rocket was launched on 18 June 1967 from the NASA wallops Island (Va.) Rocket Test Facility to study the properties of the reentry plasma sheath and its effects on microwave antenna performance. The reentry payload consisted of three major subsystems: a plasma diagnostic system, an S- band transponder system, and an X-band telemetry system. The flight data yielded (1) measurements of the influence of the plasma on the radiation pattern distortion, signal attenuation, and impedance mismatch for an S-band slot antenna located at the stagnation point of the nose cone; (2) measurements of the plasma sheath effects on the interantenna coupling between two S-band antennas on the nose cone; and (3) determinations of the electron density profile and gradients in the boundary layer about the nose cone.
Author: J. Leon Poirier
Author: J. Leon Poirier
Author: 
Author: W. Pfister
Author: 
Author: Stanton Jerrold Peale
Author: 
Author: Nicholas V. Karas
Author: J. Leon Poirier
Author: 
Author: W. Pfister