Abstract
In this communication, a wideband circularly polarized (CP) Spidron fractal microstrip antenna is proposed based on the concept of embedded structures. The proposed antenna is excited by a tapered microstrip feedline. A wide 3 dB axial ratio (AR) bandwidth of 28.81% (3.09–4.13 GHz) is obtained by merging the CP bands of the Spidron fractal slot and patch antennas. In addition, a measured −10 dB reflection bandwidth of 47.25% (2.57–4.16 GHz) is reported. The measured results are in reasonable concurrence with the simulated results. The measured gain varies between 2.12 dBic and 3.56 dBic within the AR bandwidth.
Highlights
In modern communication systems, microstrip fractal antennas (MFAs) are useful due to their low profile, light weight, multiband or broadband capabilities, and ease of fabrication
Polarized (CP) MFAs are usually preferred over the linearly polarized (LP) type because they offer advantages such as flexible orientation between the transmitter and receiver, the mitigation of multipath interference, and good mobility
This study presents a simple and effective technique based on the notion of an embedded structure for the design of a compact wideband Circularly polarized (CP) MFA
Summary
Microstrip fractal antennas (MFAs) are useful due to their low profile, light weight, multiband or broadband capabilities, and ease of fabrication. MFAs have been utilized as linearly polarized (LP) antennas, with the design objectives of broadband or multiband characteristics and size reductions [1,2,3]. To cope with the demand for modern wireless communication, a microstrip-fed fractal slot design with a 3 dB AR bandwidth of 22% has been developed [6]. Symmetric slot antennas have been proposed and designed in an effort to enhance the AR bandwidth [7, 8]. The proposed design consists of a Spidron fractal slot with an added rectangular slit and an embedded Spidron fractal patch. Details of the proposed antenna design along with the experimental results are discussed
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