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A novel design concept to reduce the frequency ratio of a dual-band dual-circularly polarized (CP) microstrip patch antenna (MPA) is presented by using its reshaped TM10, TM01, and TM20modes. First, the far-zone radiated fields of the traditional MPA are theoretically investigated. It demonstrates that the normal |Eθ| and |Eφ| fields at xoz plane are orthogonally generated under its TM10and TM01modes, respectively. Unfortunately, its TM20mode radiates the nonbroadside |Eθ| fields at xoz plane. Then, an open-ended stub is loaded around the edge of the radiator, aiming to reshape the TM20mode as the broadside radiation. After that, the patch width is decreased with the loading of two shorting pins. The main target is to move the TM01mode resonating between TM10and TM20modes. Finally, the proposed antenna is fabricated and tested. The results illustrate that its left-hand CP and right-hand CP radiation patterns are satisfactorily acquired at around 2.134 and 2.223 GHz, respectively, thus gaining a small frequency ratio of around 1.04. Meanwhile, the antenna holds the low-profile (0.02 free-space wavelength), small-backlobe, single-layer, singlefed, and single-radiator properties.
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Liu et al. (2020) studied this question.
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