KEYWORDS: Signal attenuation, Linear filtering, Microwave radiation, Radio frequency circuits, Prototyping, Photography, Information science, Computer simulations
A novel compact microstrip resonant cell (CMRC) with an ultra-wide suppressed frequency band is proposed. It consists of a pair of symmetrical stepped trapezoidal-shaped patches, two cross-connected high impedance microstrip lines and two low impedance open-ended microstrip stubs. A demonstrative low-pass filter (LPF) using a single cell of the stepped trapezoidal CMRC (STCMRC), with a compact size of 23.8mm×11mm, is designed, fabricated and measured. The insertion loss (IL) including that of testing fixture is less than 0.37dB in the pass band of 0 to 2GHz. The suppressed frequency band with a rejection better than 10dB spans from 3 to 18.2GHz, corresponding to a relative frequency bandwidth of 143%.
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