By Joseph H. Yuen(eds.)
JPL spacecraft antennas-from the 1st Explorer satellite tv for pc in 1958 to present R & D
Spaceborne Antennas for Planetary Exploration covers the advance of Jet Propulsion Laboratory (JPL) spacecraft antennas, starting with the 1st Explorer satellite tv for pc in 1958 via present study and improvement actions geared toward destiny missions. Readers persist with the evolution of all of the new designs and technological suggestions that have been constructed to fulfill the transforming into calls for of deep area exploration.
The ebook makes a speciality of the radio frequency layout and function of antennas, yet covers environmental and mechanical concerns besides. there's also an intensive remedy of the entire analytical and size ideas utilized in layout and function evaluate. each one bankruptcy is written by way of a number of top specialists within the box of antenna technology.
The presentation of the background and expertise of spaceborne antennas is aided through numerous features:
* pictures and drawings of JPL spacecraft
* Illustrations to aid readers visualize strategies and designs
* Tables highlighting and evaluating the functionality of the antennas
* Bibliographies on the finish of every bankruptcy resulting in quite a few fundamental and secondary resource material
This ebook enhances huge Antennas of the Deep area community (Wiley 2002), which surveys the floor antennas coated in help of spacecraft. jointly, those books thoroughly conceal all JPL antenna expertise, according to the JPL Deep area Communications and Navigation sequence challenge to trap and current the numerous recommendations in deep area telecommunications over the last decades.
This booklet is an interesting and informative learn for all members operating in or drawn to deep area telecommunications.Content:
Chapter 1 creation (pages 1–91): William A. Imbriale, John Huang and Mark S. Gatti
Chapter 2 The Early Years (pages 93–121): William A. Imbriale
Chapter three The Planetary Flybys (pages 123–155): William A. Imbriale
Chapter four The Mars Missions (pages 157–211): Joseph Vacchione
Chapter five The Orbiters (pages 213–303): William A. Imbriale, Mark S. Gatti and Roberto Mizzoni
Chapter 6 Spaceborne SAR Antennas for Earth technology (pages 305–340): Yunjin Kim and Rolando L. Jordan
Chapter 7 device applications (pages 341–423): Richard E. Cofield, William A. Imbriale and Richard E. Hodges
Chapter eight Mechanical improvement of Antenna platforms (pages 425–454): Gregory L. Davis and Rebekah L. Tanimoto
Chapter nine Miscellaneous different Antennas (pages 455–483): William A. Imbriale and Daniel J. Hoppe
Chapter 10 Spacecraft Antenna learn and improvement actions aimed toward destiny Missions (pages 485–536): John Huang
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Additional info for Spaceborne Antennas for Planetary Exploration
1 Theoretical Formulation. Since the tricot weave is essentially periodic, Floquet’s theorem can be applied in the analysis of a plane wave incident upon the mesh. Currents induced along the strip are modeled as a series of overlapping triangular basis functions (splines)-the coefficients of each triangle to be determined by inversion of the matrix obtained when tangential E is set to zero on the flat strips. The multiwire junction points are carefully modeled so that the currents are naturally continues through the junctions and no additional conditions are necessary.
For the first case, the data-sphere radius must be greater than or equal to the radius of the sphere enclosing the sources. For far-field data, the data-sphere radius is considered to be infinite. For the second case, the data-sphere radius must be less than or equal to the largest sphere enclosing no sources, and must be greater than zero. The maximum value of the Hankel function index that is needed to closely approximate the field is roughly equal to ku (ku + 10 is typical, but in some cases a lower limit will work), where u is the radius of the sphere enclosing all (or no) sources for the first (and second) case, respectively.
3-2) n= 1 where I n are constants and Substitute Eq. 3-2) into Eq. ,N-l and integrate from z to L on z. 3-4) and those of [ V ] are v, = SoS ( z L -rnH)Ef(z)dz. 3-5) Inverting the [ Z ] matrix to solve for [Z] and substituting in Eq. 3-2) gives the solution for the unknown current. 36 Chapter 1 In solving thin wire antennas, the integration around the current tube is normally removed by replacing the integral with the value of the integrand at one point. This then reduces the equation to a single integral and obviates the singularity of the integrand, which occurs when the source and field points coincide during the calculation of the self and first adjacent mutual terms.