Cassegrain Antenna : Report

R. V. COLLEGE OF ENGINEERING, BANGALORE DEPARTMENT OF TELECOMMUNICATION ENGINEERING Radiating Rule :News on Cassegrain Antenna Under the command of: Dr K. ShreeLakshmi Submitted by: Santosh H. R [1RV09TE047] Kishore B [1RV09TE025] Mayank [1RV09TE030] Kirthi K [1RV09TE024]
Table of Contents : ContentsPage no. 1)Introduction to Cassegrain antenna. 01 2)Geodesy of Cassegrain antenna. 02-03 3)Advantages and Drawend of Cassegrain antenna. 04 4)Applications of Cassegrain antenna . 05-06 5)Conclusion. 07 6)References. 08 Introduction: The span-reflector rule invented by Nicholas Cassegrain has been portraitured dispersed in optical telescopes, principally to close a desire potent focal elongation with a helpful material delineation. During the deceased 1950s, liked caportraiture exposed in the portraiture of this mold of rule coercion microwave frequencies.
Axially regular dual-reflector antennas (Cassegrain) augustan or figured) are of caportraiture in radio astronomy and in Earth-station antenna technology. The contemplation of such rules is frequently restricted by some habitual constraints, the mold of gratify horn portraitured, and the budget of the plan (air-tight akin to the extent of the reflectors). Taking into totality whole of the balancehead, sundry sets of input parameters, representing sundry solutions, are considered. From these input parameters, the balancewhole geodesy of the antenna is ascititious in close coercionm. •What is a Cassegrain antenna?

In teledespatch and radar portraiture, a Cassegrain antenna is an antenna in which the gratify radiator is mounted at or close the deportment of a pitted ocean reflector and is aimed at a relievant subreflector. Twain reflectors possess a mean focal object. Energy from the gratify ace (a gratify horn in-great-measure) illuminates the subordinate reflector, which reflects it end to the ocean reflector, which then coercionms the desired coercionward radiate. Cassegrain antenna is a embrace reflector rule which has numerous causeing features such as excellent willingness, mean sound region achievement, and gentle accessibility to electronic equipment. 1 Photo: Cassegrain antenna 02 Geodesy: The augustan Cassegrain geodesy, shown in the bemean thought, employs a parabolic figure coercion the ocean plate and a hyperbolic figure coercion the sub plate. Single of the span foci of the hyperbola is the veritable focal object of the rule, and is located at the hardihood of the gratify; the other is a practical gratify object which is the veritable focal object of the rule, and is located at the hardihood of the gratify; the other is a practical focal object which is located at the convergence of the parabola.
As a remainder, whole volume reflected from twain deportments, tramp similar distances to a roll in face of the antenna. Thought: Geodesy of Cassegrain Antenna Geometrical parameters coercion selected Cassegrain antenna Mold Cassegrain Focal elongation fm=1. 5meter Gap extent X Dx=2meter Gap extent Y Dy=2meter Magnification M=5 Interfocal elongation fs=1. m 03 Advantages: 1. Less disposed to end disseminate than pure parabolic antenna. 2. Much more amalgamate coercion a abandoned f/d reference. 3. Reduction in spill balance and inferior lobe radiation. 4. Ability to settle the arena in a helpful situation. 5. Capability of the scanning and broadening of the radiate by emotional single of the reflector deportments. Drawend of Cassegrain antenna: Antenna,which whether transmits or receives improve extraordinary or not attributable attributable attributable is our ocean prudence and our command,is an great sunder in any despatch rules.
Becaportraiture of the characteristics of laser incongruous from radio,the antenna rule of object-to-object laser despatch rule must be contemplationed strictly. Newton rule,Green rule and Cassegrain rule are current meanly in optical antenna rules as arena lens which enclose obliquity rule,flexion rule and obliquity-and-flexion rule. In this brochure,Cassegrain antenna is discussed. However,the undeveloped tenor of sheltering reference in Cassegrain rule leads to a waste of potent agency of the optical rule so denominated vignette phenomena.
The other is akin to optical imbecility,becaportraiture Cassegrain antenna sacrifices examination arena coercion faultless picture. 04 Applications: 1)ASTRO-G/VSOP-2 off-set Cassegrain telescope The VSOP-2 follower has an offset Cassegrain antenna. The antenna consists of a 9-m mesh-deportment paraboloid ocean reflector, a cubic hyperboloid sub-reflector, and three gratify horns. The follower has 8. 0, 22, 43 GHz ligature receivers. The ocean reflector is consisting Of 7 hexagonal modules. The radial rib building is newly adopted coercion the modules to figure a deportment with faultlessness of 0. mm-rms. And three ligature gratify horns are juxtaposed at the Cassegrain convergence. 05 2)Cassegrain Antenna With Mixed Radiate Steering Contrivance coercion Variable Follower Despatchs. A mixed antenna (HA) with a mitigated radiate steering manner is contemplated. This antenna has a Cassegrain building tight of span reflectors and a gratifyer. The parabolic-shaped ocean reflector is contemplationed coercion excellent construct, opportunity the subreflector is orderal and dull. The gratifyer is a viewd draw-up with domineering figured gap and 20 atom antennas.
The HA is worthy of span-dimensional radiate steering by resources of span operations: order of the subreflector and view restrain of the gratify draw-up. The subreflector is smwhole in extent and pressure, so it can yield speedy radiate scanning. Contemplationed to be loaded in vehicles, the HA and can promulgate with followers on the affect by tracking the radiate restrain of the gratify draw-up. A protomold of the HA is simulated with aluminum using a machining hardihood operated by computerized numerical restrain. The protomold is operated at Ka-ligature coercion TX and K-ligature coercion RX with constructs of 47 dBi and 44. dBi, deferenceively, at a steering turn of 0 . The span-dimensional radiate steering amid +/- 2 degrees with deference to 45 raising is veritableized by the subreflector and gratify draw-up. Whole radiation patterns in the radiate steering zsingle confront ITU-R s. 465-5 regulations. 06 Conclusion: This news contains the counsel of what is a Cassegrain Antenna and its contemplation parameters. We learnt of how the parabolic reflector and hyperbolic subreflectors are contemplationed based on the geodesy of the Cassegrain Antennas. We possess shown some of the advantages of this antenna balance other antennas and the source drawend of this antenna.
We possess shown span elder applications of this Antenna which deals with the contemplation of Cassegrain telescope and a radiate steering contrivance coercion variable follower telecommunications. 07 References: 1. John D. Kraus,”Antennas coercion Whole Applications”,Mac-Graw Hill Publications,4th edition. 2. Srinivasan Ashwyn,”Introduction to Cassegrain antenna” 3. Christophe Granet,”Designing Axially Symmetric cassegrain or Dual-reflector Antennas from combinations of prescribed geometric antennas”,IEEEAntennas and Propagation Magazine, Vol. 40, No. , April 1998 4. Young-Bae Jung, Alexander V. Shishlov, Member, IEEE, and Seong-Ook Park, Member, IEEE,” Cassegrain Antenna With Mixed Radiate Steering Contrivance coercion Variable Follower Despatchs,” IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 57, NO. 5, MAY 2009 5. K. KIMURA, H. OGAWA,H. UJIHARA,”ASTRO-G/VSOP-2 off-set Cassegrain telescope”, 6. Ravi Subrahmanyan,” Photogrammetric Measurement of the Gravity Deformation in a Cassegrain Antenna”, IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 53, NO. 8, AUGUST 2005 08

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