The two proposed filters described here satisfy the Federal Communications
Commission Ultra-wideband (FCC-UWB) specifications and also control the
center frequency and bandwidth of the filters passband. These filters consist
of two distinguishing parts, Electromagnetic bandgap (EBG)-embedded multiple-
mode resonator (MMR) and interdigital coupled lines to realize high
performance in the operation band with a compact size of 14.0 mm × 10.1
mm. The main advantage of the two proposed filters is that three different
bands are tuned. The 1st tuned band is from 3.5 GHz to 11.4 GHz for the first
filter and from 3.1 GHz to 11.6 GHz for the second proposed filter, respectively.
The 2nd tuned band is from 3.5 GHz to 7.5 GHz for the first filter and
from 3.1 GHz to 7.8 GHz for the second proposed filter, respectively. While
the 3rd tuned band of the first proposed filter is from 3.5 GHz to 5.9 GHz and
from 3.1 GHz to 5.8 GHz for the second proposed filter. The bandwidth of
the filters can be changed by increasing the length of the outer open circuited
stubs which are controlled by using switching matrix equipment (mini circuit,
replacement of PIN diodes). To validate the design theory, a reconfigurable
UWB bandpass filters (BPFs) with EBG Embedded MMR are designed,
fabricated and measured. Good agreement is found between simulated and
measured results.
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