A Filtering Diplexing Antenna for Dual-Band Operation With Similar Radiation Patterns and Low Cross-Polarization Levels

A compact duplex filtering antenna using a T‐shape probe‐fed patch and hairpin resonators is proposed. First, the T‐shape probe‐fed patch is designed as a dual‐band radiation element by connecting a microstrip line to the patch. Then the dual‐band radiation element is coupled to two bandpass filters based on half‐wavelength hairpin resonators directly to construct the duplex filtering antenna. The two modes of the dual‐band radiation element function as last stage resonators, improving the selectivity of both the transmitting band and the receiving band, increasing the bandwidths, and enhancing the isolation. A prototype antenna is fabricated and measured. The measured results agree well with the simulated results.

Section: Introductionmentioning

confidence: 99%

A compact duplex filtering antenna using a T‐shape probe‐fed patch and hairpin resonators

Yuan

Xie

2019

“…While the antenna integrated with the duplexer, called as filtering duplex antenna, has the characteristics of radiating, filtering, and duplexing, which is more integrated. In Reference , the filtering duplex antenna uses two microstrip resonators with different operating frequencies and then coupled to the slot loaded patch antenna to realize second‐order bandpass filter response, resulting simultaneously transmitting and receiving. While the higher mode is employed in this design, the transmitter‐receiver frequency ratio is large and meanwhile the Tx‐Rx isolation is just 20 dB at the downlink band.…”

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).

“…Typically, some of the new antennas have been studied and designed . A band‐pass filter is used to transmit the energy to the antenna, forming a good filtering antenna.…”

Section: Introductionmentioning

confidence: 99%

“…However, this filtering antenna is also formed by cascading the antenna and filter resonator, still has a large size. There are several multi frequency filtering antennas . These filters have good multiband characteristics, but they do not achieve dual polarization, which cannot be applied to multi‐channels communication system.…”

Section: Introductionmentioning

confidence: 99%

A compact low profile dual‐polarized filtering antenna with metamaterial for wideband base station applications

Zhai

2017

A compact low profile dual‐polarized filtering antenna with metamaterial for wideband base station applications is proposed in this paper. The antenna is fed by two inverted L type coupled line, artificial magnetic conductor is utilized as the reflector. Meanwhile, a stepped impedance resonator is introduced into the inverted L type feedline to suppress the radiation of the antenna outside the operating band and achieve compact structure. The mentioned antenna has 11.5 mm (0.0958λ0) profile and two frequency doubling suppression characteristics. The return loss of the antenna is <–10 dB from 2.5 to 3.2 GHz. The gain of the proposed antenna is greater than 6.5 dB over the operation band. The filtering antenna is processed and fabricated, and the measured results are consistent with the simulation results.