A compact design of defected ground antenna working in L-band is proposed in this communication. The antenna resonates in the frequency range between 1–2 GHz. The parameters such as return loss, input impedance, antenna gain and side lobe level are thus presented and discussed. A comparison is also shown for the proposed antenna with the antenna structure without defect. A very good return loss of −32 dB with a gain of 6.6 dBi is obtained for the defected ground structure (DGS) ring antenna.

Improved characteristics of DGS ring antenna in L-band

The ORS Payload Development Initiative awarded 14 contracts to develop basic to complex technologies for potential TacSat missions. The largest of the complex awards, announced in February 2007, went to Ball Aerospace and its partner ATK to perform development and risk reduction for a light-weight L-Band Synthetic Aperture Radar antenna. The program, started in April, 2007, has focused on determining the most practical and highest-performing configuration for the antenna and in reducing risk and increasing feasibility of the overall design. The motivation for this L-band SAR system, which can provide worldwide coverage daily with only two satellites, is to enable uniquely perceptive monitoring of near-real-time changes over broad regions of interest. Where further investigation is required, this would be provided by tasking more focused sensors. In developing the L-Band SAR antenna, Ball Aerospace has focused on the distributed architecture design of the radiating aperture and ATK has focused on the lightweight backing structure and deployment systems. The optimized design consists of modular tiles of 2x2 radiating elements with transmit and receive functionality provided by local electronics. 416 of these “quad” module assemblies (QMA) are mounted on stable lightweight composite panels to form a contiguous 28 m 2 aperture, with linking deployment mechanization that is derivative of heritage solar array designs. The program is preparing a complete design review documentation package and building proof of concept models that will be used to validate the capabilities of the antenna in the relevant environment. The paper will review the system design and present preliminary results from the engineering model tests.

Technology Development for Lightweight L-Band SAR

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Technology Development for Lightweight L-Band SAR