This paper presents a compact dual-band ±45 • dual-polarized base-station array based on embedded filtering elements. The proposed antenna array consists of 9 dual-band antenna units, which operate at the lower band (LB) of 790-862 MHz and the higher band (HB) of 880-960 MHz with a small frequency spacing. In each unit, one antenna element is embedded into the other one, featuring a very compact size. To alleviate the serious cross-band mutual coupling between the two elements, the LB patch antenna generates a boresight radiation null at its higher band edge, and the HB element is designed with a band-stop response at its lower band edge. In this way, high cross-band isolation between the two embedded elements can be obtained. For demonstration, a compact dual-band ±45 • dual-polarized filtering antenna array with 9 units is designed and fabricated to fit the specification of LB and HB bands (|S 11 | < −15 dB). The overall width of the array is only 280 mm, which is much narrower than that of typical industrial products using two side-by-side sub-arrays (∼576 mm). The measured performance of the antenna array can meet the requirement of base stations. INDEX TERMS Base-station antenna array, filtering antenna, dual band, mutual coupling reduction, compact size.
Abstract-In this paper, a compact differential-fed antenna with filtering responses is proposed. The antenna is composed of two radiating patches and a differential-fed circuit embedded with two u-shape slots which generate two notches. The stacked patch is employed to further improve the impedance bandwidth to fit the LTE communication application. The proposed antenna achieves the 18% impedance bandwidth. The average gain within the bandwidth is 9.5 dBi with less than 0.5 dB variation. The cross polarization ratio is less than 30dB. Out of the operating band, the gain drops sharply, exhibiting a bandpass response.
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