摘要
In order to improve the bandwidth of the conventional sub-harmonic mixer, a broad-band, high intermediate frequency（IF） sub-harmonic mixer for W-band applications is proposed. Replacing the open and short stubs that are used in the convertional sub-harmonic mixer with a broad-band band-pass filter and a low-pass filter, respectively, a wide operating frequency band is achieved. Furthermore, without the use of the edge-coupled band-pass filter at radio frequency（RF） port, the proposed structure can be realized by common hybrid microwave integrated circuit technology at W- band. The measured results show that the proposed subharmonic mixer can operate from 80 to 107.5 GHz for RF frequency and support up to 18 GHz for the IF bandwidth. Also, the measured results show that the single-sideband conversion loss is less than 13. 7 dB over the available RF frequency band, while the minimum conversion loss is about 9 dB at an RF of 92. 5 GHz and an 1F of 3 GHz. Thus, a large operating bandwidth performance at W-band can be achieved by the orooosed mixer.
为了增加传统二次分谐波混频器的工作带宽,提出了一种适用于W波段的宽带、高中频二次分谐波混频器结构. 该结构采用宽带带通滤波器和低通滤波器替代传统分谐波混频器中的开路枝节和短路枝节,实现混频器的宽带设计. 此外,由于在射频端无需使用侧边平行耦合微带线带通滤波器,所提出的混频器结构在 W 波段可以采用普通微波混合集成电路工艺实现. 测试结果表明,利用所提出结构设计的 W 波段二次分谐波混频器射频工作频带为 80 ～107. 5 GHz,中频工作频率可达18 GHz. 测试结果还表明,在工作频带内,混频器的单边带变频损耗小于 13. 7 dB; 当射频频率为 92. 5 GHz、中频频率为 3 GHz 时,变频损耗最小,约为9 dB. 由此可见,在W波段所提出的混频器结构能实现较大的工作带宽.
基金
Research Foundation of China ( No.9140A01020209JW0601)
