Abstract
A novel compact broadband Canonical Sleeve Antenna (CSA) covering 500-3600 MHz with omni directional characteristics is presented in this paper. A new method is employed in which the radiating antenna structure is designed as combination of three different canonical structures: hemispherical, conical and cylindrical elements. To accomplish the broad bandwidth with compact size, dipole antenna is designed by using cylindrical sleeve over the hemispherical dipole with conical extensions and cylindrical attachments. Performance characteristics of CSA is simulated and compared with BiConical Antenna (BCA) and other antenna configurations and found to be best antenna configuration with compact form factor. The antenna has height of 111.43 mm and diameter of 116.66 mm. Simulation studies are carried out using CST Microwave Studio. The simulated results are validated by fabricating CSA and evaluating its performance metrics. CSA has 7.2:1 bandwidth with measured VSWR <2.7:1 and Gain varies from 0 to 3.6 dBi. The antenna finds use in wireless communication industry, spectrum monitoring and defence applications.
Highlights
The rapid spurt in communication and wireless industry has created a great demand for compact omnidirectional antennas for trans-receive applications
To further improve the antenna performance, top loading concept is used by adding cylinders to Hemispherical Dipole with Conical extensions (HDC), leading to hemispherical dipole with conical extensions and Cylindrical top Loading (HDCCL) as shown in fig. 1(d)
The antenna configuration consists of hemispherical dipole with conical extensions, cylindrical top loading and cylindrical sleeve for accomplishing broad bandwidth
Summary
The rapid spurt in communication and wireless industry has created a great demand for compact omnidirectional antennas for trans-receive applications. A sleeve monopole antenna with cylindrical element having disc loading and shorting posts is reported over a frequency band of 350-1300 MHz. The antenna has impedance bandwidth ratio of 3.7:1 for 3:1 VSWR [9]. Waqas Mazhar et al proposed a broadband sleeve monopole antenna with capacitive loads, matching network and impedance transformer [12]. The antenna covers 750-2660 MHz, giving a bandwidth ratio of 3.54:1 with a circular ground plane of radius 150 mm. Zhang et al presented a conical sleeve monopole with shorting pins [17] This low profile antenna covers 446-732 MHz giving a bandwidth ratio of 1.64:1. The proposed antenna uses distributed loading impedance matching techniques and achieves an instantaneous bandwidth of 7.2:1 covering 500-3600 MHz
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