| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 96 === Filters in microwave frequency play an important role in wide application in communication, radar and signal processing systems. Traditionally, such filters have been implemented as passive networks of waveguide, transmission line, or discrete lumped elements. However, due to the improvement in monolithic microwave integrated circuit (MMIC) process technology, compared to the passive filter, the active filter is advantageous in small size, compatibility with other ICs and low loss in narrow bandwidth designs.
This thesis will focus on the high frequency and narrow bandwidth active filter designs using negative resistance compensation technique; It propose a design method to implement a microwave active Butterworth band-pass filter, at center frequency 2.44 GHz, bandwidth 83.5 MHz, in band Insertion loss near 0 dB.
Besides this, we will also discuss about how to implement active band-pass filter using negative resistance compensation technique, as tradition passive filter. The active band-pass filter will be fabricated and to verify the performance of the RF active Butterworth band-pass filter.
The Thesis presented here includes the design flow, simulation of active inductor that provides the negative resistance feature, in order to compensate the pass band transmission loss.
The filter design for the Bluetooth wireless standard and fabricated on a PCB. Measured results of the fabricated filter show near ideal band-pass response and demonstrate the potential for this technique.
We will measure the S-Parameter of the active filters and compare with the theoretical values to demonstrate the validity of the design method.
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