A printed dual‐band dipole filtenna with flexible frequency ratio and improved band‐notched performance

Abstract

A printed dual‐band dipole filtenna with flexible frequency ratio and improved band‐notched performance is proposed. It consists of a driven dipole and three parasitic elements. For the driven dipole with short and long arms, a radiation null is found between two passbands, which achieves a band‐notched filtering characteristic. Two parasitic elements are introduced to enhance the passband bandwidth and an additional parasitic element is utilized to improve the band‐notched performance. In addition, the characteristics of the proposed design including flexible frequency ratio, independent controllable operating frequency, and controllable band‐notched bandwidth have also been demonstrated. A filtenna prototype is fabricated and tested. Measured results show that a fractional bandwidth of 21.1% and 18.1% is obtained in the lower and upper passbands, respectively. The measured efficiency is 84% in the lower band and 74% in the upper band but the efficiency sharply decreases to about 13% within the notched band.

Compact tri‐band MIMO antenna based on quarter‐mode slotted substrate‐integrated‐waveguide cavity

“…Controllable operating frequencies are critical for multi‐band operations . Effect of cavity length l c on frequency response of the proposed antenna is shown in Figure .…”

A dual-band filtenna with improved gain using AMC for 5G sub-6 GHz applications

“…For multi-band filtering operation, filters are generally amalgamated into the feed lines of antennas [11][12][13]. The band notched operation and flexible frequency ratio can be achieved using parasitic elements in multi-band filtennas [14]. Alternatively, radiation nulls can also be shaped by loading shorting pins, different-shaped slots, or stacked patches [15,16].…”