Experimental testing demonstrates 66.7 percent bandwidth in an 8 × 8 millimeter-wave array, highlighting its potential for advanced fifth-generation communications.
A novel tri-mode-composite complementary source antenna is presented. The electric current source of the antenna is provided by a planar electric dipole mode, while the equivalent magnetic source is supplied by an aperture mode and a dielectric resonator (DR) mode. The combination of the three radiation modes paves an effective approach to improve the bandwidth of the complementary source antenna. The antenna is excited by employing a directly fed probe, which guarantees promising impedance matching characteristics throughout a bandwidth of about 70%. With the use of the proposed antenna element, a millimeter-wave 8 × 8 array is designed and tested. The measured results confirm that the array has a broad bandwidth of 66.7% for both |S 11 | < -10 dB and gain variation of less than 3-dB, which is wide enough to simultaneously cover all of the millimeter-wave bands for the fifth-generation (5G) communications. The radiation patterns of the array are also stable and symmetrical over the entire operating band. Benefitted from the simplified substrate-integrated geometry and the satisfying electrical performance, the proposed antenna would a promising candidate to advanced millimeter-wave systems.
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Lv et al. (2024) studied this question.
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