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In this paper, an amplitude tunable two-tone digital phase shifter is designed, fabricated, and measured. This phase shifter has 16 channels and every channel is able to output arbitrary amplitude below 0 dBm and arbitrary phase among 360°. The two-tone output frequencies are 810 MHz and 4.5 GHz which are possibly used in 5G as phase changeable local oscillator (LO) frequency for up conversion to...
A novel low-profiled broadband multi-frequency double-layer patch antenna is proposed in this paper, which operates in GSM900, DCS1800 and Wifi. Considering the broadband, directivity, and low-profile of the antenna, seven patches with different resonant frequencies are placed together on one plane. These patches are arranged to have line polarization and are perpendicular to each other. By forming...
Massive multiple-input multiple-output (MIMO) system, in which base stations are equipped with a large number of antennas in a two-dimensional (2D) antenna array, is one of the most promising technologies to improve the spectral efficiency of cellular networks. Since there is no channel reciprocity, the frequency-division duplexing (FDD) massive MIMO system has to obtain channel state information...
A novel four-way power divider based on substrate integrated waveguide is presented. Broadband performance is obtained by using a stepped coaxial line transformer together with tapered substrate integrated waveguides. Simulated and measured results show that good performance of insertion loss and impedance matching is achieved over a broad bandwidth from 4 GHz to 11 GHz. When the proposed power divider...
Waveguide slot arrays have been intensively used in a variety of wireless systems because of their compact structures, large power capacity, high efficiency, and high reliability. The resonant and non-resonant longitudinal slot, inclined slot, and transverse slot have been long studied [1–3]. Up to now, waveguide longitudinal slot arrays have been extensively analyzed and the most frequently used...
The performance of reverse-link macrodiversity in CDMA distributed antenna (DA) systems with imperfect channel estimation is analyzed by taking the effect of multi-path fading environment into account. A detailed multi-access model with MRC-based multi-path micro diversity and multi-antenna macrodiversity is presented and exact reverse-link E b/I0 expression is derived. The investigation shows that...
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