A fully tunable two-pole bandpass filter with wide tuning range based on half mode substrate integrated waveguide

作者：Lan, Bozhang^*; Guo, Chenjiang; Ding, Jun

来源：Microwave and Optical Technology Letters, 2018, 60(4): 865-870.

DOI：10.1002/mop.31058

• bandpass filter
• fully tunable
• half mode substrate integrated waveguide
• source-load coupling
• varactor

A two-pole tunable bandpass filter (BPF) which allows for the operational agility of both center frequency and bandwidth is proposed in this article. The fundamental structure is based on half mode substrate integrated waveguide (HMSIW) with different dimensions. Two sets of varactors placed at various nodes separately are utilized for adjusting center frequency and bandwidth over a wide tuning range. By adding a source-load coupling path, two transmission zeros are produced on both sides of the passband to improve filter selectivity significantly. A second-order 1.52-2.76 GHz filter with 3 dB constant bandwidth tuning from 240 to 350 MHz is developed, analyzed, simulated, and fabricated. Good agreement is obtained between simulated and experimental results.

• 出版日期2018-4
• 单位西北工业大学