Abstract
This paper presents compact UWB cylindrical dielectric resonator antenna with reconfigurable band notch capability using single varactor diode. Theoretical results are achieved for the design with the range of frequencies 4-10.6 GHz. Using single varactor diode, different notch frequencies can be obtained using different capacitance values. The effect of changing the varactor position is also examined. A Wide range of notch frequencies can be achieved using this simple configuration, which covers most of coexisted narrow band systems. The notch frequency can be lower by increasing the capacitance value. Finite Element Method (FEM) and Finite Integration Technique (FIT) are hired to simulate the proposed antenna structure using HFSS and CST MWS respectively. The notch frequency covers the WLAN band when C=0.9 pF and covers the WiMAX band when the capacitance is changed to 0.8 pF for the same antenna configuration and varactor position. The antenna with DRA has a directive radiation pattern in E-plane and omnidirectional pattern in H-plane. Also, the gain is suppressed in the notched frequency. The group delay is nearly stable in the UWB frequency range, except at the notch frequencies.
Highlights
Due to Federal Communications Commission (FCC) defined UWB between 3.1 - 10.6 GHz with a band width of 7.5GHz [1]
The group delay i s the almost flat response is noticed over the operating bandwidth, which i ndicated very little distortion sharply in the notch frequency
The UWB antenna is examined on substrate RO3003 with relative permittivity of 3 and has cylindrical D RA r adiation patch
Summary
Due to Federal Communications Commission (FCC) defined UWB between 3.1 - 10.6 GHz with a band width of 7.5GHz [1]. Dielectric r esonator antennas ( DRAs) ha ve s everal f eatures, i ncluding l ow dissipation loss, high radiation efficiency, various excitation mechanisms, different DR shapes, nearly constant gain, and compact a ntenna s ize [ 16]. It has more s hapes s uch as cylindrical [ 17], r ectangular [18], hemispherical [ 19], a nd cylindrical r ing [ 20]. The group delay i s the almost flat response is noticed over the operating bandwidth, which i ndicated very little distortion sharply in the notch frequency These results suggest t hat t he p roposed a ntenna will b e us eful widely in UWB applications
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