| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 90 === In this paper, the characteristics of aperture coupled microstrip patch antenna (MPA) and phase shifter are studied. The full-wave numerical analysis tool IE3D is used to simulate and calculate. Aperture coupled MPA , transmission type and reflective type phase shifter are built on a permittivity εr = 4.4, tanδ=0.0254 FR4 substrate. The measured antenna bandwidth is 7 %, whereas the front to back ratio is 8dB with the cross-polarized fields better than -10dB and antenna gain is about 7dBi. In addition, the bandwidth of the two type phase shifter we proposed is 40 % and 20 %, which reduce 50 % phase error compared with traditional ones at operating frequency. Whereas about 1.98~2.67dB and 3.11dB~5.07dB insertion loss is measured.
Two types of 2×2 Aperture coupled microstrip steering beam antenna array (MSBA) composed by foregoing two type phase shifter are built on FR4 substrate for C band application. The measured antenna gain are 9.2 dBi and 8.8 dBi, whereas the front to back ratio is 7~9dB with the beam scan angle in E plane is ±31degrees and ±30 degrees. The measured bandwidth of two type aperture coupled MSBA is 1~2GHz.
Finally, this paper propose a feasible method to fabricate Ka-band stacked aperture coupled MPA and MSBA built on a permittivity εr = 11.9, tanδ=0.001 silicon wafer by micromachined techniques. The results of 34 % and 6 % bandwidth, 7.9dBi and 9.98~12.15 dBi gain, F/B ratio 16dB and 10~12dB are simulated by IE3D for stacked aperture coupled MPA and MSBA, and the beam steered from —30 to +30 degrees at operating frequency.
|
|---|
