| Summary: | 碩士 === 長庚大學 === 電子工程學系 === 98 === Abstract
The purpose of this thesis is to design three 28 GHz patch antennas for Local Multipoint Distribution Service (LMDS) applications. LMDS can provide wideband internet communication by using millimeter wave transmission techniques, which is highly noticed in international literatures. The LMDS antenna is also an important issue in research. The operation frequency of LMDS antenna is very high, typically Ka-band 27.5-31.225 GHz, and its bandwidth is about 3.75 GHz. Both high operating frequency and wide bandwidth raise the design difficulty. According to the aforementioned, this thesis is divided into three LMDS antenna designs: (1)The patch antennas and feeding networks are designed to synthesize a PCB 28 GHz 2×2 rectangular patch array. In addition, the test capability for 28 GHz antenna measurement is well established. (2)The stacked patch structure is adopted to enhance antenna bandwidth, and the fabrication process of Low-Temperature Co-fired Ceramic (LTCC) is exploited for improving antenna performance. An experimental LTCC 28 GHz 2×2 stacked patch array with 9% fractional bandwidth is achieved. (3)This thesis proposes a novel via-wall stacked patch structure used for wideband 28 GHz patch antenna design. The proposed via walls can provide extra capacitively coupling to enhance bandwidth. Two different feeding layouts are implemented and compared. An experimental LTCC 28 GHz via-wall wideband stacked patch is fabricated with a very wide bandwidth of 25%.
Totally three 28 GHz patch antennas are fabricated and measured, which show good performance as expected, and can be used for LMDS applications.
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