Abstract
The problem of side lobe suppression (SLS) in printed antenna arrays has been investigated in the paper. Influence of several factors that make difficult design and realization of antenna arrays with relatively high SLS has been analyzed. We introduced a new type of printed antenna array with symmetrical pentagonal dipoles and symmetrical tapered feed network with Chebyshev distribution enabling SLS better than 34 dB in E-plane. Agreement between simulated and measured results is very good. The antenna is suitable for integration with other microwave circuits. Presented antenna is low cost and very simple for realization.
Highlights
Microwave antenna arrays are usually used in telecommunication systems such as indoor and outdoor wireless LANs, point to point and point to multipoint and in radar microwave and millimeter systems
The consequence of this is notable phase as well as amplitude deviation from optimized values. Another factor is tolerance of feed network dimensions on which amplitude and phase deviations depend directly. Another group of factors that affect side lobe suppression includes (4) surface wave effect, (5) parasitic radiation from a feed network, especially when the feed network is printed on the same dielectric substrate as the antenna elements, and (6) mutual coupling between radiating elements
It is shown that side lobe suppression (SLS), satisfactory for most microwave telecommunication and especially radar systems, is hardly achieveable with conventional microstrip antenna arrays with patches due to their narrow bandwidth that is, quick variation of impedance with dimensions change, parasitic radiation from the feed network, and surface wave effect
Summary
Microwave antenna arrays are usually used in telecommunication systems such as indoor and outdoor wireless LANs, point to point and point to multipoint and in radar microwave and millimeter systems. (1) and (2) influence tolerances of phase and amplitude of radiating elements on which SLS depends directly As it is known, microstrip patches have relatively narrow bandwidth, that is, quick change of impedance with its dimensions change. Microstrip patches have relatively narrow bandwidth, that is, quick change of impedance with its dimensions change The consequence of this is notable phase as well as amplitude deviation from optimized values. Another factor is tolerance of feed network dimensions (microstrip lines and impedance transformers) on which amplitude and phase deviations depend directly Another group of factors that affect side lobe suppression includes (4) surface wave effect, (5) parasitic radiation from a feed network, especially when the feed network is printed on the same dielectric substrate as the antenna elements, and (6) mutual coupling between radiating elements.
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