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Introduction to Lowpass Filters
Stepped-Impedance, L-C Ladder Type Lowpass Filters
L-C Ladder Type of Lowpass Filters Using Open-Circuited Stubs
Semilumped Lowpass Filters Having Finite-Frequency Attenuation Poles
Edge-Coupled, Half-Wavelength Resonator Bandpass Filters
Parallel-Coupled, Half-Wavelength Resonator Bandpass Filters
Hairpin-Line Bandpass Filters
Interdigital Bandpass Filters
Pseudocombline Filters
Filters with λg0/4 Short-circuited Stubs
Filters with λg0/2 Open-circuited Stubs

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Description

In general, the design of microstrip lowpass filters involves two main steps. The first one is to select an appropriate lowpass prototype. The choice of the type of response, including passband ripple and the number of reactive elements, will depend on the required specifications. The element values of the lowpass prototype filter, which are usually normalized to make a source impedance g0 = 1 and a cutoff frequency Ωc = 1.0, are then transformed to the L-C elements for the desired cutoff frequency and the desired source impedance, which is normally 50 ohms for microstrip filters. Having obtained a suitable lumped-element filter design, the next main step in the design of microstrip lowpass filters is to find an appropriate microstrip realization that approximates the lumpedelement filter. In this section, we concentrate on the second step. Several microstrip realizations will be described.LOWPASS FILTERSo Introductiono Stepped-Impedance, L-C Ladder Type Lowpass Filters oo Exampleo L-C Ladder Type of Lowpass Filters Using Open-Circuited Stubs oo Exampleo Semilumped Lowpass Filters Having Finite-Frequency Attenuation Poles oo Example BANDPASS FILTERSo End-Coupled, Half-Wavelength Resonator Filters ooExampleo Parallel-Coupled (Edge-Coupled), Half-Wavelength Resonator Filters ooExampleo Hairpin-Line Bandpass Filters ooExampleo Interdigital Bandpass Filters ooExampleo Pseudocombline Filters ooExampleo Filters with Landa/4 Short-circuited Stubs ooExampleo Filters with Landa/2 Open-circuited Stubs ooExample
Beginners & Professionals RF Designers,Electromagnetic device designers (Filter, Waveguide, Coupler, etc...),Engineering Students,Academics and Researchers

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