Abstract
In this work, the design of a novel Ka-band miniaturized bandpass filter with broad bandwidth is demonstrated by using inversely coupled U-shaped transmission lines. In the proposed filter, two transmission zeros can be generated within a cascaded U-shaped structure and it can also be proven that, by inversely coupling two stacked U-shaped transmission lines, the notch frequency at the upper stopband can be shifted to a lower frequency, which results in a smaller chip size. The key parameters affecting the performance of the proposed filter are investigated in detail with the effective lumped-element circuit illustrated. Fabricated in a 0.13-μm SiGe BiCMOS process, the proposed filter achieves an insertion loss of 3.6 dB at a frequency of 28.75 GHz and the measured bandwidth is from 20.75 GHz to 41 GHz. The return loss is better than −10 dB from 20.5 GHz to 39 GHz. The lower transmission zero is located at 11.75 GHz with a suppression of 54 dB while the upper transmission zero is around 67 GHz with an attenuation of 34.6 dB. The measurement agrees very well with the simulation results and the overall chip size of the proposed filter is 176 × 269 μm2.
Highlights
The bandpass filters (BPF) become more and more significant with the emergence of 5G technology, which utilizes millimeter-wave as its carrier frequency
The proposed BPF is fabricated in a commercial 0.13-μm SiGe BiCMOS process
Besides the two top metal traces, the capacitor in the proposed filter is implemented in a metal-insulator-metal capacitor (MIMCAP) form, which make use of the silicon nitride layer provided by the process
Summary
The bandpass filters (BPF) become more and more significant with the emergence of 5G technology, which utilizes millimeter-wave (mm-Wave) as its carrier frequency. A novel miniaturized bandpass filter with wide bandwidth is demonstrated by inversely coupled. Two transmission zeros can can be implemented within a cascaded U-shaped structure and it can be proven that, by inversely using inversely coupled transmission lines.the. U-shaped structure can alsozero be proven that,of bythe inversely coupling two stacked lines, transmission frequency upper can be implemented within a cascaded. U-shaped structure and it can be proven that, by inversely coupling two stacked lines, the transmission zero frequency of the upper stopband can be shifted to a lower frequency, leading to a reduced chip size. Fabricated in a couplingSiGe two stacked lines, the transmission zero frequency of stopband can BiCMOS be shifted to a lower frequency,filter thusachieves leading a reduced chip size.
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