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A compact printed differential multiple-input–multiple-output (MIMO) antenna is presented for ultrawideband system applications with band-notched characteristic. The proposed MIMO antenna element consists of a differential U-shaped microstrip feedline and a stepped-shaped slot, printed on the bottom and top of the substrate, respectively. A half-wavelength resonant stub embedded in the stepped-shaped...
In this paper, we use commercial impulse radios and spiral phase plates to generate two different orbital angular momentum (OAM) beams from 71 GHz to 76 GHz. In addition, we have experimentally demonstrated that those two different OAM beams can be multiplexed and demultiplexed over the same frequency radio channel at 2 meters range. At the same time, those two channels can work independently with...
In this letter, a dual-band differential CPW-fed MIMO antenna for Worldwide Interoperability for Microwave Access (WiMAX) application is proposed. The antenna has a square ring ground and a common patch which is shared by two pairs of differentially-fed ports. By arranging two pairs of differential ports orthogonally in the virtual ac ground of each other, the differential isolation can be infinite...
In this paper, the generation and steering of beams carrying orbital angular momentum utilizing a custom-designed circular antenna array has been demonstrated at 28 GHz. A steering angle as large as 30 degrees for an orbital angular momentum (OAM) beam has been achieved. The effect of number of antennas and the distance from antennas to the array center to the quality of beam generation and beam steering...
This paper reports an experimental demonstration of modal multiplexing using orbital angular momenta (OAM) in the millimeter-wave regime (28 GHz). Using 1 GBaud/s signals with 16-QAM modulation, a data rate of 32 Gbit/s is obtained by employing 4 different OAM modes (l= −3,−1,+1 and +3) on two orthogonal linear polarization states. Without any digital post-processing, the receiver can separate the...
In this paper, a 27.6 GHz Ka-band quadrature Doppler radar system is developed to measure the movement amplitude of periodic movement. Experiments were conducted to verify that by increasing the carrier frequency from 5.8 GHz to 27.6 GHz, the resolution can be improved to be in the sub-millimeter range. The relation between the sensitivity-limited detection range and movement amplitude under certain...
A dual rhombic loop antenna with double parasitic loops to increase the bandwidth of circular polarization operation is proposed. The gap position of each loop controls the sense of circular polarization. The original dual rhombic loop radiates a CP wave at a lower frequency while the parasitic loop produces CP radiation at a higher frequency. A combination of the two frequencies leads to a bandwidth...
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