Design of Substrate-Integrated-Waveguide Antennas for Application in Aircraft Communication

• Main Authors: Bo-Wei Yu, 余柏緯
• Other Authors: 劉文忠
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/wr96px

碩士 === 國立虎尾科技大學 === 航空與電子科技研究所 === 101 === In this thesis, a simple and low-profile substrate-integrated-waveguide (SIW) slot antenna with omni-directional radiation pattern has been presented. The 50 ohm micro-strip line coupled with progressive taperd stripline was used as the feeder. For reaching the better impedance matching, via holes were arranged in shapes like the the downward bottle cap and the upward semi-circle,and thus made the antenna into a SIW structure. Based on this prototype, a rectangular slot without digging at its two top coners and a vertical slot at the lower middle position of the rectangular slot, and finally, a horizontal slot on the grounded back plane were arranged to the prototype. By way of adjusting both position and dimension of these slots, proper electromagnetic coupling effect between the vial holes and slots was obtained and forms a uniform current distribution for 360?omni-directional radiation. An optimal antenna design with good impedance matching and omni-directional pattern was finally obtained. Prototype of the proposed design has been constructed and experimentally studied. The measured results show that the antenna, resonanting at 4.29 GHz, has an 10 dB impedance bandwidth of 200 MHz, or 4.7 %. The obtained omni-direction performance is suitable for use in the aircraft communication system. As for the other study of this thesis, a substrate-integrated-waveguide slot antenna featuring circular polarization has been proposed. Also, this antenna is fed by a micro-strip line and which was linked to the substrate. The via holes were arranged around the side of top plane. To further enhancing the circular-polarization bandwidth, an L-shaped slot was embedded on the radiating plane. From carefully adjusting the respective dimensions of the slot, two surface current distributions with nearly equal amplitude and 90? phase difference was achieve and thus results in function of circular polarization. The main resonant frequency of this proposed antenna is 5.25 GHz and frequency band is 5.16 to 5.35 GHz with a bandwidth of about 190 MHz, which is 3.7% with respect to the main resonant frequency. Agreement between the simulation and measurement seems good and the proposed design is suitable for use in the WLAN IEEE-802.11a, b, g, n communication systems.