Abstract
A compact wideband high-rejection microstrip bandstop filter (BSF) is presented. This filter combines two traditional BSFs: open-stub filter and spurline filter. Due to the inherently compact characteristics of the spurline, the proposed filter shows a better rejection performance than open-stub BSF without increasing the circuit size. From 3.7 to 5.4 GHz, the proposed BSF has a rejection of better than 20 dB and the maximum rejection level of 61 dB. Application of this BSF to suppress the second harmonic of an open-loop ring bandpass filter is also investigated with a 40-dB suppression improvement achieved.
Original language | English |
---|---|
Pages (from-to) | 268-270 |
Number of pages | 3 |
Journal | IEEE Microwave and Wireless Components Letters |
Volume | 15 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2005 |
Keywords
- Bandstop filter (BSF)
- Harmonic suppression
- Spurline