Abstract
A microstrip-fed new UWB monopole antenna with a band-notch characteristic mounted on the finite cylindrical surface is presented. The proposed antenna consists of a rectangular metal radiation patch fed by a 50 ohm microstrip line and a rectangular ground plane. To achieve ultra-wideband, three modifications are introduced. The first one is to blend the upper and lower corners of the radiating plates. The second one is to remove a circular section from the radiating metal. The third one is to blend the upper corners of the ground plane. The antenna is designed on a substrate with dielectric constant εr=3 and 1.6 mm height. The proposed antenna is conformed on finite cylindrical substrates of radiuses 4, 5 and 6 cm. The cylindrical structures were simulated through CST microwave studio finite element package. The simulation results, obtained via CST package on the return losses, VSWR and radiation pattern of the antenna are presented. For both planar and conformal antennas, results show that the impedance bandwidth of the designed antenna is from 2-18 GHz with a return loss less than -10 dB (VSWR<2) and a band rejection of 5-6 GHz for wireless LAN (WLAN), that includes the band 5.15-5.825 GHz limited by IEEE 802.11.a and HIPERLAN/2 with return loss greater than -10dB. The proposed simple shaped conformal antenna provides a good radiation pattern and gain between 3.84 and 5.96 dBi over the entire frequency band excluding the rejected band.
Highlights
Monopole antennas, which feature broad bandwidth and small size, have received intensive attention in ultra-wideband UWB applications, due to the merits of wide impedance bandwidth and omnidirectional radiation pattern [1]
It is found that the impedance bandwidth slightly improves at lower frequencies, up to 5 GHz, for all cylinders used in the simulation
This paper proposes and simulates a new simple shape band-notched ultra-wideband antenna
Summary
Monopole antennas, which feature broad bandwidth and small size, have received intensive attention in ultra-wideband UWB applications, due to the merits of wide impedance bandwidth and omnidirectional radiation pattern [1]. To avoid any electromagnetic interference on wireless LAN systems, many UWB antenna structures and techniques have been studied. The cylindrical geometry can offer certain desirable antenna characteristics that are not provided by planar elements [6]. Due to their conformability with the hosting structure, microstrip antennas find many applications related to curved structures such as cylindrical structures, high speed aircrafts and spacecrafts [7]. The first part describes the proposed planar monopole UWB antenna with a notch band characteristic. Results obtained on return loss, VSWR and radiation pattern are presented and discussed
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