Dual-Polarized Filtering Antenna With High Selectivity and Low Cross Polarization

This article presents a low‐profile filtering antenna based on nonuniform metasurface for fifth generation (5G) systems at 3.5 GHz. A crossed stub, slotted ground, shorting via, and the nonuniform metasurface is used to achieve high gain and filtering response in lower and upper stopbands. The antenna and the metasurface are printed on Rogers RO4003C (εr = 3.38, tan δ = 0.0027) and Taconic TLX‐9 (εr = 2.5, tan δ = 0.0019), respectively. Measured results show that the antenna has an impedance bandwidth of 3.24 to 3.8 GHz (15.91%) below −10 dB with a stable gain having a maximum value of 10.43 dBi and good radiation patterns. Moreover, this antenna passband satisfies the typical bandwidth required for the global 5G spectrum at the 3.5 GHz band. The gain drops significantly and the S11 goes up to 0 dB outside the passband. Due to the excellent filtering characteristics, the proposed antenna is a good candidate for 5G applications.

Section: Introductionmentioning

confidence: 99%

A low‐profile high‐gain filtering antenna for fifth generation systems based on nonuniform metasurface

Park

Jeong

Hussain

et al. 2019

“…To solve this problem, integrating the antenna and duplexer or filter is a promising solution. The integration of antenna and filter is reported as filtering antenna, with the performances of radiating and filtering . While the antenna integrated with the duplexer, called as filtering duplex antenna, has the characteristics of radiating, filtering, and duplexing, which is more integrated.…”

Section: Introductionmentioning

confidence: 99%

Integrated filtering duplex patch antenna with small frequency ratio and high isolation

Lin

Zhang

Xie

2019

An integrated filtering duplex antenna with small frequency ratio and high isolation is proposed in this article. First, a small transmitter‐receiver frequency ratio of stacked patch antenna is realized by soldering short circuit chips to the driven patch. Then, the asymmetric transmission zero technology is employed in the sets of dual‐mode resonators to realize high port‐to‐port isolation. Moreover, the ports coupling mode of the dual‐mode resonator is changed to achieve further Tx‐Rx isolation. For demonstration, the proposed antenna is fabricated and experimentally characterized in WCDMA band. The measured results show that it can mainly operate over the uplink and downlink operation band of WCDMA with an isolation level better than 32 dB, and the frequency interval (Δf = (f r − f t)) is only 0.09 times of the central frequency ((f r + f t)/2).

“…Nevertheless, it is extremely challenging to employ this geometry and achieve dual linear polarization property, with the objective to create additional dual‐polarized resonances by adding several layers of parasitic structures for bandwidth enhancement, especially in the case of exploiting usual probe‐fed manner . In addition, a complicated stacked‐ or feeding‐layer structure would frequently manifest when there is high isolation, so good impedance and radiation performance over the entire band of interest are simultaneously required . Actually, in many situations, there is a preference to focus more attention on the devising of the lower feeding structure/patch, such as exploiting slot coupling feed or E‐shape patch, with parasitic layers for wider bandwidth.…”

Section: Introductionmentioning

confidence: 99%

A low‐profile dual‐polarized multilayer parasitic patch array antenna with narrow air gap

Tang

2018

This article proposes a low‐profile dual‐linear polarized multilayer parasitic patch array antenna, which is composed of 3‐layer printed substrates and 1 air gap layer inserted between the lower and middle substrate. There is 1 slotted square patch printed on the lower substrate with 2 excited probes acting as feeding element, and 1 and 4 slotted square patches are on the middle and upper substrate respectively as parasitic elements. The stacked patches introduce additional dual‐polarized resonances for bandwidth enhancement. Specifically, the T‐ and rectangular slots and T‐stubs are employed near/on the orthogonal axis of the patches in order to achieve impedance matching and to improve 2 orthogonal polarizations. Furthermore, 6 stacked complementary split‐ring resonators (CSRRs) are loaded in the middle and upper substrate mainly for both impedance matching and port isolation adjustment. Simulated and measured results comply with each other, which shows that the fabricated antenna has an operational fractional bandwidth of 6.6% (2.34–2.5 GHz), a maximum gain of 7.9 and 6.9 dB at port 1 and 2 (while 10.2 and 9.3 dBi for the simulated ones), respectively, and port isolation better than 19 dB. In addition, the air‐gap thickness can be maintained at an extremely narrow level of 0.02λ0 (λ0 is the free‐space wavelength at the central frequency).