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Journal Article
Compensated Circuit with Characteristics of Lossless Double Negative Materials and Its Application to Array Antennas
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- Authors
- S.-S. Oh, L. Shafai
- Issue Date
- 2007-02
- Citation
- IET Microwaves, Antennas and Propagation, v.1, no.1, pp.29-38
- ISSN
- 1751-8725
- Publisher
- IET
- Language
- English
- Type
- Journal Article
- Abstract
- A compensated circuit showing the characteristics of lossless double negative (DNG) materials is proposed and applied to an active integrated antenna array. A properly selected matching circuit produces the phase advance, which is characteristic of a left-handed wave (backward-wave), and the lossy resonant circuit generates the negative group velocity. An amplifier is used to compensate for the inherent loss of the resonant circuit, including its resistor. Then, a series-fed antenna array with a proposed DNG circuit is also designed and fabricated. It consists of two subarrays, each made of two aperture-coupled patch antennas, and the DNG circuit block inserted between the subarrays. In comparison to a conventional array, without the DNG circuit whose two subarrays are connected directly by a microstrip line, the proposed array shows a negligible beam squint and flat gain, over a considerable bandwidth of 11%. © 2007 The Institution of Engineering and Technology.
- KSP Keywords
- Active integrated antenna(AIA), Aperture coupled, Array antenna, Coupled patch, Double negative(DNG), Double negative materials, Microstrip Line, Negative group velocity, Patch Antenna, Resonant Circuit, antenna array