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The stationarity region, i.e., the area in which the statistics of a propagation channel remain constant, is an important measure of the propagation channel, and essential for efficient system design. This paper presents what is to our knowledge the first extensive measurement campaign for measuring the stationarity region of MIMO mm-wave channels. Using a novel 28 GHz phased-array sounder with high...
A reconfigurable patch antenna with symmetrical structure for polarization diversity is proposed in this article. The proposed antenna mainly consists of a rhombus-shaped patch with single feed, two conductive pads with via hole and two PIN diodes. The antenna can produce right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) by adjusting bias state of two PIN diodes. The...
In this paper, a shorted monopole antenna for LTE/WWAN mobile handset applications is presented. The antenna consists of a monopole, a coupling strip, a feeding pad, a stub, and a shorting strip. The basic resonance of the monopole combines with the resonance formed by the coupling that occurs between the coupling strip and the feeding pad to include the LTE700, GSM850, and GSM900 bands. The resonance...
A new low-complexity antenna diversity architecture, using a 2.4-GHz single low-IF receiver chain with a novel antenna selection scheme, is exploited by using 0.18-μm CMOS technology. The receiver has been developed for the IEEE standard 802.15.4 radio system and two RF input channels are selected through an efficient analog-type antenna selection scheme for achieving the diversity. Compared to conventional...
This paper gives the results of mutual comparison of free-space antenna factors between NICT of Japan and RRL of Korea. To obtain the free space antenna factors, NICT use the curve fitting technique using standard antenna method, RRL use height scanning averaging in which the insertion loss depending on the height from ground is averaged. Although the maximum deviation between the values calibrated...
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