Hall, "Reconfigurable bandstop
filter with wide tuning range", Electronic Letters, vol.
Control of bandstop
response of Hi-Lo microstrip low-pass filter using slot in ground plane.
In particular, microwave bandstop
filters are used quite often in cellular base stations, navigation systems and alike.
This paper proposes a simple and efficient technique in discrete-time domain which does the lowpass highpass bandpass and bandstop
filtering of the input auto and cross correlation sequences of discrete-time real wide sense stationary (WSS) process through exponential rectangular triangular and trapezoidal shaped windows in linear time.
At the resonant frequency the structure acts as a bandstop
filter, attenuating most of the transmitted power.
Coupled-line is an usual and classical structure to exploit lowpass filter , bandstop
filter [2-4], bandpass filter (BPF) [5-12], reconfigurable BPF  and dual-band BPF [14-17].
Chen, "A microstrip ultra-wideband bandpass filter with cascaded broadband bandpass and bandstop
filters," IEEE Trans.
With the rapid development in wireless technology and modern communication systems, bandstop
filters are widely used to attenuate the interfering signal in the systems.
Parallel Coupled Bandstop
Filter Using Double Negative Coupled Transmission Line, IEEE Microwave and Wireless Components Letters 17(4): 283-285.
A sharp-edged transmission bandstop
is in demand where excellent out of band transmission is desired.
filters with an attenuation of 50 dB in the stopband were used.
The fifty-one papers are organized into sections covering direct-coupled cavity filters; transformed-variable synthesis, combline, and interdigital filters; cross-coupled and pseudo-elliptic filters; parallel-coupled line, hairpin-line, and microstrip-bandpass filters; dielectric-resonator filters; bandstop
filters; lowpass filters; suspended substrate stripline filters; lumped element filters; and power-handling, insertion loss, group delay, and tuning.