Abstract
This paper proposes a novel dual-polarized filtering patch antenna without an extra circuit. The proposed antenna shows a quasi-elliptic filtering response with four radiation nulls. One radiation null is achieved with a stacked patch, and three more radiation nulls are introduced by the split ring resonators (SRRs) placed inside the antenna aperture. The SRR can achieve one radiation null, and the shorted SRR (SSRR) can achieve two radiation nulls for its odd and even modes. This filtering antenna is fabricated on two stacked substrates with three metallic layers, which is suitable for integration. As demonstrations, two antennas are designed to meet the applications for the 5G band (4.8-5 GHz) for S11 <; -10 dB with the total profile of 0.06 λL, where λL is the free-space wavelength at the lowest operating frequency. The antenna implemented on FR4 substrate achieves an average gain of 5 dBi, while the antenna fabricated on two substrates, Rogers-4350 and FR4, can improve the realized gain to over 6 dBi. The measured isolation is better than 20 dB within the operating band. The out-of-band gain suppression level is more than 15 dB within the 3.4-3.6 GHz and more than 20 dB for WLAN band.
Highlights
With the development of the wireless communication systems, more diverse means of communication systems are established with their own frequency bands
Dual-polarized antennas working in different bands are usually needed to meet the requirements of different systems
Various types of filtering antennas have been proposed in references [2]–[26], including single-polarized antennas [2]–[15], dual-polarized antennas [16]–[24] and circular
Summary
With the development of the wireless communication systems, more diverse means of communication systems are established with their own frequency bands. A novel dual-polarized filtering patch antenna without extra circuit is presented This patch antenna is fed directly by two feeding probes and fabricated on two stacked substrates with three metallic layers, which is suitable for integration. The realized gain within the working band can be improved by using the upper patch as a director, and one radiation null at the boresight direction can be introduced to the higher band of the stacked antenna [10], compared with the single-patch antenna. It can be seen that the two-turn SRRs can introduce one radiation null (3.8 GHz) in the lower stop band, and a quasi-elliptic filtering response is achieved. The SRRs and SSRRs can reduce the realized gain in all directions, while the stacked patch introduces radiation null in the broadside direction at the upper frequency band. The deviation between the simulated and measured results is attributed to the tolerances of fabrication and measurement
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