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Novel Coplanar-Strip-Based Excitation Technique for Design of Broadband Circularly Polarization Antennas with Wide 3-dB Axial Ratio Beamwidth
Abstract
In this paper, a novel excitation technique for design of a single-point-fed compact low-profile wide-slot antennas with broadband circular polarization (CP) and wide 3 dB axial ratio (AR) beamwidth is presented. Two inverted L-shape parasitic strips placed coplanar to the microstrip line of an asymmetric CPW, and a horizontal strip that protrudes from the vertical edge of the backside ground plane of the substrate are used for CP excitation. The overall footprint of the structure is only Ls × Ws = 0.3 λ0 × 0.28 λ0 when measured at the lowest operating frequency. The antenna prototype has been validated experimentally. The measured results indicate that a wide impedance bandwidth of 72% (2.26 GHz-4.85 GHz) and a CP bandwidth of 66% (2.44 GHz- 4.87 GHz) can be achieved. In addition to the wideband characteristics in terms of the impedance bandwidth and CP, a stable bidirectional radiation pattern with a wide 3 dB beamwidth of 85° ± 5° is obtained for 58% of the total CP bandwidth without involving any complex circuitry. Furthermore, by placing a flat metallic reflector behind the antenna, a unidirectional radiation pattern is produced without changing the geometrical dimensions of the proposed antenna. The average realized gain of the antenna without a reflector is 3.3 dBi, whereas it increases up to 6.3 dBi with the substrate-size reflector.
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Authors (2)
-
Ullah Ubaid
- Reykjavik University School of Science and Engineering
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
no. 67,
pages 4224 - 4229,
ISSN: 0018-926X - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Ubaid U., Kozieł S.: Novel Coplanar-Strip-Based Excitation Technique for Design of Broadband Circularly Polarization Antennas with Wide 3-dB Axial Ratio Beamwidth// IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION. -Vol. 67, iss. 6 (2019), s.4224-4229
- DOI:
- Digital Object Identifier (open in new tab) 10.1109/tap.2019.2908114
- Verified by:
- Gdańsk University of Technology
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