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Design of metamaterial superstrates and substrates for directivity and port isolation enhancement of a dual‐frequency dual‐polarization microstrip antenna
Author(s) -
Lee Dong H.,
Lee Young J.,
Yeo Junho,
Mittra Raj,
Park Wee S.
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.21764
Subject(s) - directivity , metamaterial , patch antenna , microstrip antenna , ground plane , optics , microstrip , microwave , optoelectronics , materials science , multi band device , antenna (radio) , frequency band , electrical engineering , engineering , physics , telecommunications
In this paper, we propose a novel design for enhancing the directivity and port isolation of a dual‐frequency dual‐polarization (DFDP) microstrip antenna by using metamaterial superstrates and substrates. To enhance the directivity of this without a complex feed network, we first design a strip‐mesh type of Frequency Selective Surface (FSS) type superstrate as a cover for a DFDP antenna, which supports two orthogonal polarizations at two different resonant frequencies. Next, a 2D anisotropic uniplanar compact bandgap type ground plane is introduced to enhance the isolation between the two ports of the DFDP antenna. It is demonstrated that the directivity at two frequency bands is enhanced by about 13 dB in the first band and by ∼12 dB at the second one, when compared with the patch antenna alone. Also, the isolation between the two ports is shown to be −35 dB, which is −15 dB lower than that of a conventional patch antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1873–1876, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21764