研究目的
To propose a novel dual-pole dual-throw (DPDT) waveguide switch for high-power and low-loss applications based on the contactless properties of the gap waveguide technologies in the Ku frequency band.
研究成果
The proposed waveguide DPDT switch, based on gap waveguide technology, shows good electrical performance with return loss and insertion loss better than 25 and 0.1 dB, respectively, and isolation better than 60 dB in the frequency bandwidth from 11 to 13.5 GHz. The switch is ideal for high-power applications and aerospace applications due to its construction from a single metal material without using MEMS or ferrite.
研究不足
The tradeoff between gap height and EBG bandwidth and isolation between ports is a limitation. Higher gap height decreases the required machining and alignment precision but also decreases the EBG bandwidth and isolation between ports.
1：Experimental Design and Method Selection
The design rationale is based on the contactless properties of gap waveguide technologies. The methodology involves the use of two concentric contactless cylinders with standard rectangular waveguide ports (WR 75) and waveguide paths machined in the middle of these cylinders.
2：Sample Selection and Data Sources
The structure is simulated using CST Microwave Studio by an eigen-mode solver with top and bottom boundaries of the unit cell set as periodic boundary condition, while the outer cylinder creates a PEC boundary condition.
3：List of Experimental Equipment and Materials
The proposed switch was fabricated by machining a piece of aluminum material. Scattering parameters of the switch were measured using Agilent E8363C PNA microwave network analyzer with waveguide thru-re?ect-line (TRL) calibration.
4：Experimental Procedures and Operational Workflow
The rotational movement of the inner cylinder is realized using two bearings in the top and bottom of the DPDT. The structure is fabricated and the measured results are compared with the simulated ones.
5：Data Analysis Methods
The measured results are analyzed to determine the insertion loss, return loss, and isolation between ports.
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