Abstract
In this paper, a miniaturized Butler matrix design method using folded structure is introduced. The Butler matrix was fabricated in multi-layer using Low temperature cofired ceramics (LTCC) and designed to operate at 28 GHz. The conventional one-layer Butler matrix has a disadvantage in that the length has to be increased inevitably and the volume of the system is increased. By using the proposed folded structure, the length can be reduced by more than 2 times compared to the general one-layer Butler matrix. In order to minimize the loss, it was designed in a stripline structure by forming a ground plane on the upper and lower surfaces of each layer. A signal is transmitted between layers through via holes.
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