No abstract

This article presents a dual‐band shared‐aperture antenna. The lower‐band antenna consists of two printed dipoles operated in a 1.6‐2.4 GHz frequency band. An artificial magnetic conductor (AMC) is used to reduce the lower‐band antenna profile. The higher‐band antenna consists of 4 × 2 aperture coupling patches operated in 5.3‐7.1 GHz frequency band and placed between the antenna ground plane and the AMC. The AMC elements act as a bandpass frequency‐selective surface for the higher‐band antenna. Simulated and measured results show that the proposed antenna has 40% and 29% impedance and 3‐dB gain bandwidths for the lower‐band and higher‐band antennas, respectively, and port isolation of less than −20 dB.

A dual‐band shared‐aperture antenna with a frequency ratio of 3 is presented in the letter. A low‐band antenna consists of two printed dipoles. An artificial magnetic conductor (AMC) is used to reduce the height of the low‐band antenna. A high‐band antenna consists of four printed dipoles. It is placed between the AMC elements and the antenna ground plane. The AMC elements and antenna ground plane form a Fabry–Perot cavity and allow increasing gain of the high‐band antenna. An additional structure is inserted between the antenna ground plane and the AMC elements to decrease heights of the Fabry–Perot cavity and the high‐band antenna simultaneously. The total size of the proposed antenna is 1.02λL × 1.02λL × 0.103λL (λL is the central wavelength of the low operating band). Simulated and measured results show that the designed antenna has 57% and 16.7% bandwidths in the low‐ and high‐frequency bands.