본 논문에서는 밀리미터파 대역 전력증폭기가 출력단에 PBG (photonic bandgap structure) 구조를 설치함으로써 성능개선 되었다 PBG 구조는 Ka 대역에서 저역통과 특성을 갖도록 최적화되었다. 전력증폭기의 하모닉은 PBG 구조에 의하여 억제되었고 50 GHz에서 40dBc 개선되었다 전력증폭기의 IMD와 PAE는 PBG에 의하여 기존의 전력증폭기에 비하여 각각 $15\%$와 $25\%$ 개선되었다.
The performances of millimeter wave Power amplifier have been improved by using PBG (photonic bandgap structure) in this paper. The PBG structure has been optimized to obtain the lowpass characteristics in Ka band and employed at output port of Ka band power amplifier. The harmonics of the power amplifier have been suppressed by the PBG of output port and the proposed PBG has suppressed the second harmonic to 40dBc around 50 GHz. The improvements of IMD and PAE of the amplifier employing the PBG structure are obtained $15\%$ and $25\%$, compared with those of the conventional Ka band power amplifier, respectively.
