This paper present several wide-band millimeter-wave antennas for high data-rate mobile application. In Chap. 2, a wideband aperture efficient 60-GHz series-fed E-shaped patch antenna array with co-polarized parasitic patches is proposed for high-data rate communication. A novel series-fed E-shaped patch antenna array with co-polarized parasitic patches for enhanced aperture efficiency at 60-GHz unlicensed wide band applications is proposed. The additional radiation from the inserted co-polarized parasitic patches between series-fed patches improves the gain flatness remarkably as well as the gain and aperture efficiency, because of the off-set resonant frequency. In Chap. 3, a 60-GHz wideband switched-beam dipole array fed hybrid horn antenna is proposed. Compared to a dipole array, a 6.7-dB gain improvement was achieved, and the 6.5GHz bandwidth is further improved from 7.6GHz by forming additional resonance, which is caused by the gap between the dipole array and horn structure. Furthermore, compared to the outcome of a conventional horn antenna, the radiation angle can be varied widely. In Chap. 4, 60-GHz low-profile, wideband dual polarized U-Slot coupled patch antenna with high isolation is proposed. The proposed antenna exhibits broadband characteristics that entirely cover the 60-GHz industrial, scientific, and medical (ISM) band, by forming additional resonance at the U-shaped coupled slot. The port isolation is improved by up to 38.6 dB via circulating current in the feed line of the isolation port, which is caused by a reverse placement between the current distributions of the circular patch and U-shaped slot. This phenomenon occurs at the resonant frequency point of the circular patch, and is caused by inducing currents of the U-shaped slot and the patch orthogonally to the feeding line. Chap. 5 describes a 60-GHz wideband, low-power active receiving antenna with adjustable polarization is proposed for SNR Improvement.
본 논문은 밀리미터파 대역 고속 통신을 위해 여러 광대역 안테나를 제안한다. 챕터 2에서, 광대역 개구-효율적인 60-GHz 대역 기생패치 추가된 E-모양 패치 어레이가 제안되었다. 새롭게 제안된 기생패치를 통하여 안테나의 이득 및 이득 평탄도가 개선되었다. 챕터 3에서는, 60-GHz 광대역 하이브리드 타입 다이폴 어레이- 혼 안테나가 제안되었다. 다이폴 어레이에 혼을 추가함으로써, 이득 개선, 대역폭 증가 및 셀프-쉴딩 효과가 개선되었다. 챕터 4에서는 60-GHz 고격리광대역 U-slot 커플링 이중편파 패치 안테나가 제안되었다. U-slot 그라운드와 패치 안테나의 흐르는 전류를 반대로 유도하여 격리 포트에 흐르는 전류를 최소화 하여 격리도를 개선시켰다. 챕터 5에서는 60-GHz 대역 편파 제어 수신 안테나가 제안되었다. 챕터 4에서 설계된 이중편파 안테나와 가변이득증폭기, 위상천이기, 전력 병합기를 이용하여 22.5deg 의 편파 해상도를 갖는 편파 제어 수신 안테나를 설계하였으며 검증하였다.
