Abstract
A printed monopole in its planar and vertical configuration has been designed, fabricated and analyzed for microwave applications on low cost FR4 substrate material of thickness, h = 1.56 mm and relative permittivity, er = 4.3. The designed planar monopole has been simulated and experimented to find its frequency response with coplanar waveguide feed to exhibit dual band characteristics with -10 dB reflection loss bandwidth of 45.078 % (i.e. 1.5:1 between 1.334 and 2.109 GHz) and 114.92 % (i.e. 3.7: 1 between 3.99 and 14.77 GHz). The vertical monopole using the same patch has also been simulated and experimented and -10 dB reflection loss bandwidth of 173.67% (14.2:1 between 0.925 and 13.125 GHz) has been obtained. The antenna finds many applications in microwave bands.
Highlights
Days, there is a great demand for wide bandwidth in microwave frequency region due to increasing number of wireless applications and to boost high data rate for faster communication [1]-[5]
The planar monopole antenna may be useful for unified applications covering GPS (1.565-1.585 and 1.2271.575GHz), PCS (1.8-2GHz), WLAN (5.15-5.35, and 5.725-5.850GHz), GSM1800, DCS1800
Printed monopole antenna designed on low cost FR-4 substrate material in planar and vertical configurations using fractal patch and coplanar waveguide (CPW) feed has been investigated
Summary
There is a great demand for wide bandwidth in microwave frequency region due to increasing number of wireless applications and to boost high data rate for faster communication [1]-[5]. Wider bandwidth [6] in an antenna has become a challenge Many techniques such as stacked patches, multi-resonator configurations using excited and parasitic patches and gap coupling or proximity coupling method, monopole geometry, slot loading using microstripline feed, fractal grounding [1]-[25] have been proposed. Any further increase in the substrate thickness to increase bandwidth decreases the efficiency and increases cross-polar level and inductive reactance due to increased probe height This leads to excitation of substrate modes at discontinuities to generate scatter at other discontinuities to offer undesirable radiations at undesirable polarization. The antenna efficiency, polarization, and radiation patterns are degraded due to excitation of higher order modes of the patch that contribute to the radiation This problem can be solved by using a patch without the substrate with a perpendicular ground plane fed by a coaxial feed known as vertical monopole
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