Abstract
In this paper, a new slant-polarized slot antenna configuration is presented for direction finding and base station applications. The proposed antenna comprises enhanced size coaxial cables, slots, and feeding assemblies. The slant polarization is achieved by four angled slots etched around the outer cylinder of the oversized coaxial cable. An internal compact axis-symmetric feeding network connects primary apertures to form the omnidirectional antenna. Simulations and measurements demonstrate that the antenna maintains an omnidirectional pattern from 2.5 GHz to 2.8 GHz, having 11.3% bandwidth (measured return loss <−10 dB) and gain ripple of ±0.2 dB in the azimuth plane, which leads to the stable operational coverage. Another benefit of this structure is its polarization purity. The cross-polarization levels are below −14dB over the whole bandwidth. Move over; it is ruggedized DC short, self-supporting, and surface-mountable structure. Furthermore, compact and conformal shape reduces aerodynamic drag and makes this antenna a potential candidate for mounting vehicle systems too.
Highlights
INTRODUCTIONAntennas are always considered to be an essential part of communication systems. [1,2,3]
Antennas are always considered to be an essential part of communication systems. [1,2,3].Spectrum sensing and Direction Finding (DF) systems are widely used for locating and suppressing unwanted communications in war or search and rescue operations in peacetime
Cellular communication (LTE) implements the Small cell or ultra-small cell equipment having omnidirectional antennas so that the coverage area is tessellated smoothly even in shadowed region [7]; Such applications require a rugged antenna having an omnidirectional pattern with reduced azimuthal gain variations within a compact size
Summary
Antennas are always considered to be an essential part of communication systems. [1,2,3]. Spectrum sensing and Direction Finding (DF) systems are widely used for locating and suppressing unwanted communications in war or search and rescue operations in peacetime Such systems usually incorporate omnidirectional antennas because of the ease of phase calculation of the incoming signal [4, 5]. Dipole [15] antennas are extensively used to produce vertical polarization with omni pattern, while omnidirectional antennas having horizontal polarization usually consist of loop elements [16,17]. The proposed configuration has better polarization purity, as cross-pol are low as compare to that of the co-pol This is the first time that an antenna is reported which is (Direct Current) DC short, conformal, and having low azimuthal gain variations and aerodynamic drag. The paper flow is such as: in Section 2, antenna configuration is presented: Section 3 consists of feed mechanism; in Section 4, antenna analysis and design topology are discussed; Section 5 describes antenna fabrication and experimental verifications; Section 6 presents a comparison of the proposed work with published work; Section 7 ends with the conclusion
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