Micromachined coupled resonator butler matrix

Li, Shuli (2014). Micromachined coupled resonator butler matrix. University of Birmingham. M.Phil.

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Abstract

This thesis presents the design and characterisation of a micromachined Butler Matrix operating at WR-3 band (220 GHz to 325 GHz). For this thesis a two port Butler matrix is used, here there are two input ports and two output ports. When signal is applied to one of the input ports then it is equally split between the output ports, but has a 90 degree phase shift. In general Butler matrices can have many ports. Conventionally transmission lines are used to make a Butler Matrix but in this thesis, the Butler Matrix is realised only in resonators. This technique is implemented by the appropriate couplings between resonators and the coupling between the resonators and the external ports. The method has the advantage of applying to any type of resonator can be used no matter what its physical structure. SU-8 photoresist micromachining technology is used for fabrication and three metal-coated SU-8 layers are used to implement this micromachined coupled resonator Butler Matrix. The fabrication process was not successful thus no useful measurement results had been made. Low loss bends are designed for the connections between the Butler Matrix and the loads and flanges. A two-element slotted waveguide antenna array is designed to be connected to the Butler Matrix to build a beamforming system and to verify the characterisation of the Butler Matrix.

Type of Work:

Thesis (Masters by Research > M.Phil.)

Award Type:

Masters by Research > M.Phil.

Supervisor(s):