Wide Bandwidth Ratio of 10-to-1 CPW-Fed Whip Antenna with Improved Radiation Patterns

In this paper, a microstrip-fed U-shaped dielectric resonator antenna (DRA) is simulated, designed, and fabricated. This antenna, in its simple configuration, operates from 5.45 to 10.8 GHz. To enhance its impedance bandwidth, the ground plane is first modified, which leads to an extended bandwidth from 4 to 10.8 GHz. Then by inserting a rectangular metallic patch inside the U-shaped DRA, the bandwidth is increased more to achieve an operating band from 2.65 to 10.9 GHz. To validate these results, an experimental antenna prototype is fabricated and measured. The obtained measurement results show that the proposed antenna can provide an ultra-wide bandwidth and a symmetric bidirectional radiation patterns. With these features, the proposed antenna is suitable for ultra-wideband applications.

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A Horizontally Polarized Rectangular Stepped Slot Antenna for Ultra Wide Bandwidth With Boresight Radiation Patterns

IEEE Transactions on Antennas and Propagation ◽

10.1109/tap.2014.2321132 ◽

2014 ◽

Vol 62 (7) ◽

pp. 3501-3510 ◽

Cited By ~ 29

Author(s):

Raj Kumar ◽

Rajas Khokle ◽

R. V. S. Ram Krishna

Keyword(s):

Slot Antenna ◽

Radiation Patterns ◽

Wide Bandwidth

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Embroidered Βow-Tie Wearable Antenna for the 868 and 915 MHz ISM Bands

Electronics ◽

10.3390/electronics10161983 ◽

2021 ◽

Vol 10 (16) ◽

pp. 1983

Author(s):

Theodoros N. Kapetanakis ◽

Martin Pavec ◽

Melina P. Ioannidou ◽

Christos D. Nikolopoulos ◽

Anargyros T. Baklezos ◽

...

Keyword(s):

South America ◽

Resonant Frequency ◽

Radiation Patterns ◽

Wide Bandwidth ◽

Sierpinski Triangle ◽

Wearable Antenna ◽

North And South America ◽

North And South ◽

Fabrication Parameters ◽

Good Agreement

A textile, embroidered antenna, based on the fractal shape of the Sierpinski triangle, is designed in this paper for operation in the European free Industrial Scientific and Medical (ISM) 863–870 MHz band, as well as in the 902–928 MHz band designated for ISM applications in North and South America. Several prototypes have been fabricated by employing different stitch patterns and thread materials. The effect of the fabrication parameters on the performance of the proposed antenna is investigated through measurements and simulations, with the results being in good agreement. The antenna exhibits attractive characteristics such as wide bandwidth, relatively stable radiation patterns, as well as robustness in washing. Several tests reveal that convex and concave bent conditions do not affect the coverage of the aforementioned ISM bands, despite the shift of the resonant frequency in some cases. Moreover, the SAR values resulting from simulations are below the corresponding thresholds suggested by international guidelines.

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