A Low-Profile Dual-Band Coaperture Monopolar Antenna Based on Cross-Layer Folded Structure

作者：Li, Yuan Chun; Tu, Hua Hui; Wang, Kai Xu^*; Xue, Quan; Wong, Hang

来源：IEEE Transactions on Antennas and Propagation, 2021, 69(10): 6936-6940.

DOI：10.1109/TAP.2021.3076355

• Antennas
• Dual-band
• low-profile
• monopole-like pattern
• wideband antenna

A dual-band coaperture monopolar antenna with a very low profile is investigated in this communication. A novel cross-layer folded structure is proposed to construct a single-band monopolar antenna in the lower band. It can provide enough space for another higher band section to be integrated together without extra profile. Meanwhile, by adding a high-frequency radiation element to the reserved space, a dual-band coaperture antenna with independent frequency control is obtained. Moreover, by exciting TM01 and TM02 modes in both bands, the proposed antenna can achieve a relatively large impedance bandwidth of 10.9% in the lower band and 14.6% in the upper band with a thickness of 3.14 mm. Stable monopole-like radiation patterns are achieved within the two bands and the gains in the lower and upper bands are 5.2-5.8 and 3.7-5 dBi, respectively. Compared with other works, the proposed antenna features its low-profile and independent band performance.