W. Liu, Z. N. Chen and X. Qing, "60-GHz Thin Broadband High-Gain LTCC Metamaterial-Mushroom Antenna Array," in IEEE Transactions on Antennas and Propagation, vol. 62, no. 9, pp. 4592-4601, Sept. 2014. doi: 10.1109/TAP.2014.2333052
A low-profile broadband metamaterial-mushroom antenna array is proposed for high-gain 60-GHz band applications. The antenna array consists of a single-layer mushroom radiating structure and a simplified single-layer substrate integrated waveguide (SIW) feeding network. A new transmission-line based model is presented to estimate the resonant frequencies of the operating and antiphase modes. With the metamaterial-mushroom structure, the closely-placed antenna elements realize less mutual couplings, higher aperture illumination efficiency compared to conventional patch antennas. An 8 8 mushroom antenna array is designed and prototyped using low-temperature cofired ceramic (LTCC), the measurement
shows the antenna array with the feeding transition proposed an impedance bandwidth of 56.3–65.7 GHz with a boresight gain greater than 21.2 dBi and up to 24.2 dBi at 62.3 GHz. The proposed antenna array features the merits of high gain, broadband, compact size, and low cross-polarization levels.
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