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Design and Fabrication of Fractal Filters by Using LTCCKuo, Chi-Min 20 June 2006 (has links)
In this thesis we propose several novel configurations of bandpass filters (BPFs)
with two transmission zeros by using the fractal theory. By means of the fractal
theory, the dimension of the proposed BPFs can be effectively reduced. Furthermore,
the proposed BPFs can be easily fabricated by using multilayer structure based on
low-temperature cofired ceramic (LTCC) technology. Under the condition of the
same dielectric thickness and coupling coefficient, we compared the conventional
square open-loop BPF with the proposed fractal ones. The results show that the
reduction in the dimension of the proposed BPFs is evident. Specifically, the
dimension of the proposed Koch¡¦s, Minkowski_1st, and Minkowski_2nd filters can be
reduced by about 36.5%, 32%, and 51.5%, respectively. Finally, the simulation and
measurement results are reported in this thesis.
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Analysis and Design of Miniaturized High-DK LTCC Balun Filter with Imaginary ImpedanceChiu, Hung-Wei 24 July 2008 (has links)
This thesis proposes methodology to design a balun with imaginary impedance. Under given specification, including center frequency, size, output impedance, our methodology can be used to evaluate its feasibility of implementation using high-DK LTCC(Low Temperature Cofired Ceramic) process. We then extend the design to incorporate a filter, which can simplify the circuit to reduce the required components. An example of our design operating at 2.4 GHz is implemented. Its size is 1600¡Ñ800¡Ñ650 um3, showing significant miniature. The simulation and measurement results are shown to verify the effectiveness of our design.
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Design and Implementation of LTCC Bandpass Filters Using a Second Order Coupled Resonator Structure for WiMAX ApplicationsSu, Sheng-Yang 21 July 2007 (has links)
This thesis proposes an analytical method to synthesize bandpass filter with multiple transmission zeros. By using the six pre-determined parameters including two reflection zeros, two matching quality factors, and two transmission zeros, the method can exactly synthesize the corresponding prototype of second-order coupled-resonator bandpass filter. The synthesized filters not only can provide two pre-determined transmission zeros in the lower and upper side of the passband, but also can generate an extra transmission zero in the stopband. This thesis presents the prototypes of the bandpass filter and the methods of synthesis in detail. Finally this thesis implements compact LTCC bandpass filters by using the proposed synthesis method for 3.5 GHz WiMAX applications.
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