Investigation and design of an ultra-wideband fractal ring antenna for notch applications

Abstract

In this article, an ultra wideband ring antenna with a fractal formation for notch application is presented. The antenna was printed on FR-4 substrate, which was a low cost one with the relative permittivity of 4.4 and thickness of 1.6 mm. The total dimension of antenna was 50 mm 3 50 mm. It could be applied as a notch antenna for propagation rejection in IEEE 802.11a for instance by covering were as without conflicting with wireless systems. The prototype antenna presented in this article, has a rejection band at 5-6 GHz and covers the frequency range of 2.1-11 GHz with the VSWR of less than 2. For improvement of the notch frequencies and for obtaining dual notch band characteristic some changes in prototype antenna with a slot at fractal structure have been performed. The final antenna had dual notch band at 2.5 and 5.5 GHz. The current distribution in the notch frequency has been provided. The efficiency has also been checked for the entire frequency band. The maximum antenna gain was achieved between 2-8 dBi. All the simulations were done in HFSS and compared with the experimental results.

An UWB trapezoidal rings fractal monopole antenna with dual‐notch characteristics

“…Further the antenna rejects all the LTE 2500 band, 2600 to 2660 MHz WiMAX band and 3300 to 3700 MHz WiMAX bands, which is particularly helpful for operation in the 4G mobile communication environment. The structure in Reference can reject the LTE 2500 band, but it has larger dimensions. The 3300 to 3700 MHz WiMAX band is rejected by the structures proposed in References , , .…”

“…The dimension of the antenna in Reference is comparable to the proposed one. Finally, the antenna has simple ring geometry and do not need any extra stubs, slots or filter circuit in the radiator to obtain the notch bands. So design complexity can be avoided.…”

Flower‐shaped ultra‐wideband fractal antenna

“…So, fractal antenna structures are good candidates for UWB applications. In the literature, some UWB fractal antenna geometries are available …”

A Circular Disc Microstrip Antenna with Dual Notch Band for GSM/Bluetooth and Extended UWB Applications

“…The notch band is created by using a strip slot entrenched at the center of the radiating patch [16]. A CPW fed fractal ring antenna with 2.5 GHz and 5.5 GHz dual notch band is reported [17]. In this antenna, desired notch band characteristics are achieved by using fractal ring shape structure.…”