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A K-/Ka-band planar shared-aperture beam-scanning array with a high-isolation for the emerging mm-Wave shared-aperture terminals

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Science China(Information Sciences) 2023年第5期66卷 257-270页

作者： Zi-Jun GUO Zhang-Cheng HAO Zhuo-Wei MIAO Hao-Yu YIN Chen-Yu DING Hao-Jie GANG State Key Laboratory of Millimeter Waves School of Information Science and Engineering Southeast University Purple Mountain Laboratories

A planar K-/Ka-band shared-aperture array with the steerable beam is proposed in this paper. The substrate-integrated coaxial line(SICL)-excited short-circuited-stub-loaded longitudinal slot and substrate-integrated double line(SIDL)-excited slot-loaded patches are employed to radiate K-/Ka-band waves, respectively. Then, to constitute the 1-D K-/Ka-band arrays, the center-fed SICL feed network and SIDL-based full diferential feed network are introduced to widen the bandwidth. Finally, the GCPW-toSICL and GCPW-to-SIW transitions are adopted to excite the proposed array, respectively. Both SICL and SIDL feed networks are located below the radiating aperture. Those arrays are interleaved and shared the same radiation aperture, as well as the shielding metallic-via-array for achieving a compact footprint. To excite the above radiating elements, the SICL center feed network and fully diferential feed network are introduced to widen the bandwidth. The channel isolation is improved by utilizing the fully diferential feed network and the filtering response of the SIW. Equivalent circuits are proposed for designing the proposed antenna. Thanks to the miniaturized geometries of K-/Ka-band arrays, the proposed antenna is able to scan up to 60? and 35? at K-/Ka-band, respectively. As an example, a shared-aperture array with a steerable beam is developed and fabricated by using a multilayer printed circuited board with the designed frequencies of 19 GHz(17.7–20.2 GHz) and 29 GHz(27.5–30 GHz). The aperture dimension of the array antenna is49.6 mm×40.75 mm. A good consistency between the simulation and measurement is acquired. The measured peak gains in K-/Ka-band are 16.6 and 17.6 d Bi. When the radiation beam points to 0?, the 3-d B gain bandwidth at K-band is 14.9%(17.4–20.2 GHz), while the 3 d B gain bandwidth at Ka-band covers from 27.6to 30.4 GHz, i.e., a bandwidth of 9.7%. When the radiation beams are deflected to 60? and 35?, the measured gains of the proposed antenna flu

关键词： shared-aperture high isolation beam-scanning substrate-integrated coaxial line substrate-integrated double line

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