Zheng, "A compact dual-band bandstop filter
with defected microstrip slot," Journal of Electromagnetic Waves and Applications, Vol.
A UWB bandstop filter
using the D-CRLH-TL, which is consists of an "H"-shaped DGS and two stubs with rectangular patches, is proposed in this paper.
Zhu, "New defected microstrip structure bandstop filter
," PIERS Proceedings, 1471-1474, Suzhou, China, Sep.
There are many methods to achieve an elliptic or quasi-elliptic bandstop filter
Thus, a dual narrow-band bandstop filter
is constructed and its configuration is depicted in Fig.
In order to analyze the proposed dual-band bandstop filter
in detail, comparison of the bandstop filter
with normal arrayed and stagger arrayed DGS patterns is given in Fig.
A suitable application of the coupling matrix technique to bandstop filters
expands the use of matrix operations beyond passband responses.
We normalize the bandstop filter
's center frequency at 1 GHz, and it leads to transmission zeros distributed by pairs symmetrically placed around the center frequency [f.sub.0].
It is usually necessary to add either the lowpass or bandstop filter
that can reject the spurious signals.
Finally, an ideal bandstop filter
with normal operating frequency (1 GHz) is designed, calculated, and discussed by using lossless transmission-line and coupled-line models.
The traditional methods include: a wide-band bandpass filter and a bandstop filter
cascaded  and two different filters set in parallel .
There is no upper frequency limit for passing the sinusoidal signal from the bandstop filter
. This happens because we have a large voltage drop on the resistance of potentiometer when Rpoten.