Abstract
In this paper, the state-of-the-art integrated filtering antennas with dual-band operation are first reviewed. Then, two designs of dual-band microstrip filtering antennas with a low-frequency ratio are presented. The 1st design is a dual-band dual-polarization (DBDP) antenna with a frequency ratio of 1.2 on a single patch, by employing the coupled resonator technique. Two bands at each polarization are achieved by vertically coupling a hairpin resonator with a patch through a slot in the ground plane and then coupled to a dual-mode stub loaded resonator. Each band exhibits a 2nd-order filtering performance with improved bandwidth and out-of-band rejection. Such an integration technique could significantly reduce the dimension and the complexity of the traditional DBDP antennas/arrays. In the 2nd design, a novel dual-port dual-band antenna (with a frequency ratio of 1.38) with the integrated filtering and duplexing functions is proposed. The frequency duplexing function is implemented by coupling a single patch with two sets of resonator-based filtering channels via a U-slot resonator inserted in the ground. This device seamlessly integrates the functions of duplexers, filters, and antennas in a very compact structure.
Highlights
Radio frequency (RF) frontends with integrated multiple functions have attracted wide attention in the recent years due to many advantages over the traditional cascaded RF frontends
The integration of RF frontends could contribute to the reduction of the loss and cost of mm-wave devices [13]–[16]
The two resonant modes of the U-slot patch are separately coupled with a stub-loaded resonator (SLR), resulting in the dual-band operations and each with a 2nd-order filtering performance
Summary
Radio frequency (RF) frontends with integrated multiple functions have attracted wide attention in the recent years due to many advantages over the traditional cascaded RF frontends. In [20]–[26], integrated filtering antennas with dual-band operation were reported. Two novel integrated dual-band filtering antennas with a low frequency ratio are proposed. Mao et al.: Integrated Dual-Band Filtering/Duplexing Antennas resonant structures to generate two closely situated operation bands. A DBDP filtering antenna element with a low frequency-ratio of 1.2 is achieved using a single square patch. A dual-port dual-band antenna with integrated duplexing and filtering functions is developed. This physically separated antennas could render the flexibility to control and optimize the two bands
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