Dual-Band Antenna With Wideband Harmonic Suppression Based on Dual-Function Slot Structure

• Published in: IEEE antennas and wireless propagation letters Vol. 20; no. 7; pp. 1297 - 1301
• Main Authors: Nie, Na, Tu, Zhi-Hong
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-07-2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Bandwidths; Broadband; Communications systems; Dual band; Dual-function; Gain; Harmonic analysis; harmonic suppression; Low frequencies; Microwave antennas; Millimeter wave communication; Millimeter waves; Parasitic elements (antennas); Radiators; Reflectance; Slot antennas; slot structure
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2021.3078506

A dual-band antenna with wideband harmonic suppression based on dual-function slot structure is presented for the future microwave and millimeter-wave communication system in this letter. In the low-frequency band, the slot serves as the radiator, and both two parasitic patches and four slot-stubs are also introduced in the slot to increase the bandwidth. In the high-frequency band, this slot works as the feeding structure, which excites the 2 × 4 millimeter-wave patch array. Meanwhile, the wideband harmonic suppression between dual frequency bands is achieved by loading both four open-stubs on this slot and a T-stub in this slot. A prototype is fabricated and measured to validate the design, which covers a dual band of 5 and 27 GHz. Their measured -10 dB relatively impedance bandwidth is 21.9% and 13.7%, respectively. Moreover, the measured reflection coefficient is higher than -1 dB and the measured gain is lower than -10 dBi from 7 to 21.5 GHz, showing the characteristic of good harmonic suppression.