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Abstract

Active control of antenna radiation by mechanical reconfiguration has large potential applications in space as well as in ground segment. Such reconfigurable antenna primarily has two functionalities: beam steering and beam shaping. While previous research has shown individual control of these functions; we have developed a suitable antenna actuation system which takes care of both the functionalities. To demonstrate our concept, we have fabricated a 1-m diameterC-band flexible reflector of poly-ether-ether-ketone using precisely machined aluminum mold. A periphery feed structure is connected to the center of the reflector by a goose-neck-shaped supporting frame. Next, we have designed and developed a smart control-disk containing two types of shape memory alloy actuator-based self-locking devices. A group of actuators are used for locking/unlocking the rotational degree of freedom of the antenna; while the other group generates deformation of antenna at the desired direction. An 8-bit absolute encoder is installed with each locking device to sense and feedback the displacement of a control point. We have achieved a controllable deflection up to 25 mm with a precision of 0.3 mm with this system. A directional precision of $0.2 \circ$ is also achieved simultaneously. Presently, we have developed eight such actuation points on the disk to control the shape of the antenna. For numerical simulation of the structural deformation and study of the radio frequency pattern, finite element analysis is carried out using ABAQUS, and the far-field radiation pattern corresponding to the deformed shape is obtained. The electromagnetic patterns are analyzed using geometric optics technique. Finally, a methodology of achieving surface coordinates for desired radiation pattern is presented. The study provides useful insights into the design of flexible and reconfigurable antenna system.

Keywords

Intelligent structure reconfigurable antenna shape memory alloy actuators parabolic smart antenna smart direct to home antenna system

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References

Balanis

(1989) Antenna Theory Analysis and Design. Hoboken, NJ: John Wiley & Sons.

Brinson

(1993) One-dimensional constitutive behavior of shape memory alloys: thermomechanical derivation with non-constant material functions and redefined Martensite internal variable. Journal of Intelligent Material Systems and Structures 4(2): 229–242.

Chen

Pan

(1998) Guyan reduction. Communications in Applied Numerical Methods 4(4): 1–8.

Cherrette

Lee

Acosta

(1989) A method for producing a shaped contour radiation pattern using a single shaped reflector and a single feed. IEEE Transactions on Antennas and Propagation 37(6): 698–706.

Cohen

(2004) Application of dielectric elastomer EAP actuators. In: Kornbluh

Pelrine

Pei

et al . (eds) Electroactive Polymer (EAP) Actuators as Artificial Muscles Reality Potential and Challenges. Bellingham, WA: SPIE Press, pp. 533–577.

Cooley

Chwalek

Ramanujan

(2000) Method for improving pattern bandwidth of shaped beam reflectarrays. Patent 6031506, USA.

Duan

Wang

(2009) Reflector antenna distortion analysis using MEFCM. IEEE Transaction on Antenna and Propagation 57(10): 3409–3413.

Glynn

(1987) Antenna system parabolic reflector, flat plate shroud and radome. Patent 5999143, USA.

Gupta

Seshu

Issac

et al . (2006) Optimal steering of a paraboloid antenna using piezoelectric actuators. Smart Materials and Structures 16(1): 67–75.

10.

Hwang

(1992) Satellite antennas. Proceedings of the IEEE 80(1): 183–193.

11.

Jeong

Young

Lee

(2012) Development of a tape spring hinge with a SMA latch for a satellite solar array deployment using the independence axiom. In: Proceedings of the 2nd international conference in mechanical, industrial and manufacturing engineering, Singapore, 27–28 June, pp. 225–231. New York: Elsevier.

12.

Kalra

Bhattacharya

Munjal

(2017) Design of shape memory alloy actuated intelligent parabolic antenna for space applications. Journal of Smart Materials and Structures 26(9): 1–14.

13.

Landeros

Neri

Samano

(2006) A tutorial on the synthesis of single shaped reflectors in C, KU, and KA bands. Taylor and Francis 26(2): 131–154.

14.

Pramod

(2009) Antennas and its applications. DRDO Science Spectrum, pp. 66–78. Available at: https://www.drdo.gov.in/drdo/pub/dss/2009/main/13-ARDE.pdf

15.

Rao

Pan

(1990) Optimal placement of actuators in actively controlled structures using genetic algorithm. AIAA Journal 29(6): 942–943.

16.

Tabata

Natori

(1996) Active shape control of a deployable space antenna reflector. Journal of Intelligent Material Systems and Structures 7(2): 235–240.

17.

Tanaka

Sakamoto

et al . (2016) Development of a smart reconfigurable reflector prototype for an extremely high-frequency antenna. Journal of Intelligent Material Systems and Structures 27(6): 764–773.

18.

Turner

(2001) Thermomechanical response of shape memory alloy hybrid composites. NASA/TM-2001-210656. Available at: www.ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20010024159.pdf (accessed 13 May 2018)

19.

Wolcott

Wang

Zhang

et al . (2013) Radio frequency patch antenna reconfiguration with Ni-Ti shape memory alloy switches. Journal of Intelligent Material Systems and Structures 24(8): 973–983.

Development of shape memory alloy actuator integrated flexible poly-ether-ether-ketone antenna with simultaneous beam steering and shaping ability

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