Abstract
This paper deals with the design of a microstrip series power divider for circularly polarized sequential rotational antenna array. The theoretical description of the design is firstly proposed, comprising the cases of nonuniform weighted antenna arrays. A more flexible open octagon shape instead of the classical open ring is suggested, highlighting benefits in the case of nonuniform power distribution. A design example of an ultra-high frequency (UHF) band 4×4 sequentially rotated Tschebischeff antenna array finally demonstrates the effectiveness of the proposed implementation.
Highlights
Polarized (CP) patch antennas have gained considerable interest due to their main advantage of being insensitive to depolarization [1, 2]
A more flexible open octagon shape instead of the classical open ring implementation is proposed. This modification provides better results because of the flexibility to realize different quarter wave transformer lengths, which better address the case of different quarter wave transformer characteristic impedance
A common microstrip implementation of the series divider has an open ring shape [4, 12,13,14], and it is depicted on the left side of Figure 2 for a right hand circular polarization (RHCP) antenna array
Summary
Polarized (CP) patch antennas have gained considerable interest due to their main advantage of being insensitive to depolarization [1, 2]. In [12], Evans et al describe the use of a series feed network to provide appropriate phase shifting and power splitting among the radiating elements They have implemented such a feed network with an open ring shaped structure. The same implementation is used in [4, 13, 14], even if no theoretical elements for the series feed network design are provided, except in [4], where only the uniform weighted antenna array case is treated. A more flexible open octagon shape instead of the classical open ring implementation is proposed This modification provides better results because of the flexibility to realize different quarter wave transformer lengths, which better address the case of different quarter wave transformer characteristic impedance.
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