Abstract:
This paper presents a novel compact folded bandpass filter in empty substrate integrated coaxial line (ESICL)
technology. To obtain these compact filters, the inverters are
modified to provide a 180◦
bend when inserted in an ESICL line.
As a result, the proposed filter has a more compact topology
based on parallel resonators. A sixth-order Chebyshev bandpass
filter operating at 3 GHz has been designed, manufactured and
measured to experimentally validate this new folded configuration. The length of the novel compact filter has been reduced by
82.2% with respect to an equivalent in-line filter, obtaining very
similar results in terms of electrical response
