Abstract
In this paper, a duplexing antenna and two multi-band filtering antennas using resonator loaded slot are presented. The loaded slot can be flexibly designed as a dual-band or a tri-band antenna by changing the number of the loaded resonator. The operating frequencies of the slot antenna can be easily controlled through tuning the lengths and positions of the loaded elements. By integrating the multi-band antenna and the multi-mode resonator, duplexing and filtering antennas can be realized. The duplexing antenna consists of two single-mode resonators, a dual-mode stub-loaded resonator as the junction resonator and a dual-band slot antenna. The dual-band and tri-band filtering antennas each contains a dual-mode resonator or a tri-mode resonator, radiating through resonator loaded slot antenna. Since the slot is the only radiation element, all the operating bands of the three antennas show good bi-directional radiation patterns. For validation, all of the antennas are designed, manufactured and measured.
Highlights
In modern communication systems, more and more attention has been paid to the investigation of slot antennas because of the attractive features including low cost, low profile and light weight [1]
Multi-band slot antennas have been of great interest due to the co-exist of multiple communication systems which can reduce the size of RF front end by integrating the multi-bands into one antenna [2], [3]
The duplexing antenna is composed of two singlemode resonators with different operating frequencies, one dual-mode resonator and a dual-band slot antenna
Summary
More and more attention has been paid to the investigation of slot antennas because of the attractive features including low cost, low profile and light weight [1]. In [10], a duplexing dual circularlypolarized antenna was proposed using a shared radiator which doesn’t resonate at the operating frequency. In [12], the duplexing filtering antenna radiate through a common slot loaded cavity which can obtain a compact size.
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