Microfluidically Tunable Microstrip Filters
Abstract
A new approach for the development of tunable and reconfigurable microstrip (MS) devices is proposed. The basic idea consists of using a suspended substrate with an integrated network of plastic tubes, which can be selectively filled in with a high-permittivity dielectric fluid, e.g., water. The local change of the substrate effective permittivity achieved in such a way enables one to change, in a controlled and reversible manner, the electrical length of certain elements of MS circuits. As a proof-of-concept, tunable stub resonators based on suspended and inverted MS lines are designed and characterized in frequency and time domains. The same principle is then applied for the development of a fourth-order bandpass filter with 40% fractional bandwidth operating at 5 GHz. A tunable range of 19.5% with the insertion loss of 0.6 dB is demonstrated. The performance of the stub resonators and filter is validated successfully via prototyping
Keywords
band-pass filters
bandwidth 5 GHz
Dielectric fluid
Electron tubes
fourth-order bandpass filter
high-permittivity dielectric fluid
loss 0.6 dB
microfluidically tunable microstrip filters
Microfluidics
microstrip circuits
microstrip filters
Permittivity
plastic tubes
reconfigurable
Resonant frequency
Scattering parameters
Substrates
suspended microstrip (MS) line
suspended substrate
tunable filters
tunable stub resonators
Tuning
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