Abstract
This paper presents a single-pole 32-throw (SP32T) switch with an operating frequency of up to 6 GHz for 5G communication applications. Compared to the traditional SP32T module implemented by the waveguide package with large volume and power, the proposed switch can significantly simplify the system with a smaller size and light weight. The proposed SP32T scheme utilizing tree structure can dramatically reduce the dc power and enhance isolation between different output ports, which makes it suitable for low-power 5G communication. A design methodology of a novel transmission (ABCD) matrix is proposed to optimize the switch, which can achieve low insertion loss and high isolation simultaneously. The average insertion loss and the isolations are 1.5 and 35 dB at 6 GHz operating frequency, respectively. The switch exhibits the measured input return loss which is better than 10 dB at 6 GHz. The 1 dB input compression point of SP32T is 15 dBm. The prototype is designed in 5 V 0.25 μm GaAs technology and occupies a small area of 12 mm2.
Highlights
Interconnections between the chip and printed circuit board (PCB) are a key consideration for the package operating at the mm-wave band
The wire-bonding method is utilized for the chips and PCB connection
This paper reports a highly integrated single-pole 32-throw (SP32T) switch fabricated in a 0.25 μm GaAs process
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. MIMO can use the large-scale antenna array at the base station (including dozens or even hundreds of array elements) to significantly improve the spatial resolution, and form a narrow beam pointing accurately It can reduce the interference between users, serve multiple users with very small power consumption at the same time, and effectively improve the spectral efficiency of the system. This kind of system can connect multiple antennas to one RF chain at the same time, which is very suitable for a large-scale MIMO system with a large number of antennas. Most of these switches have low integration with limited bandwidth and are difficult to utilize for large-array systems.
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