Abstract
A Lowpass Filter with Sharp Roll - off and High Relative Stopband Bandwidth Using Asymmetric High - Low Impedance Patches
Highlights
Microstrip lowpass filters (LPFs) as key microwave components are in high demand in wireless communication systems
In order to improve in-band and out-band performances of LPFs, many efforts have been done in recent years
To achieve an ultra-wide stopband both triangular and radial patch resonators have been applied to the structure of the proposed LPF, in [5]
Summary
Microstrip lowpass filters (LPFs) as key microwave components are in high demand in wireless communication systems. For instance in [1], a stub-loaded coupled-line hairpin unit has been utilized to design a LPF with sharp cutoff and wide stopband. To design a LPF with an ultra-wide stopband rejection, both triangular and polygonal patch resonators are used [2], but this structure does not have a sharp transition band. To achieve an ultra-wide stopband both triangular and radial patch resonators have been applied to the structure of the proposed LPF, in [5]. This circuit has a gradual cutoff frequency. Another way to expand the stopband region is using hairpin resonator [6], [7].
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