This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
A compact ultra-wideband (UWB) bandpass filter (BPF) is proposed based on end coupled microstrip transmission line, defected ground structure and defected microstrip structure. The experimental filter shows a fractional bandwidth of 110% at a centre frequency, with two observable transmission zeros (attenuation poles) at 2.1 and 11.7 GHz. Measured results exhibit an UWB passband from 3.02 to 10.6 GHz with mid-band insertion loss of 1.8 dB and group delay variation <0.45 ns. The BPF achieves a wide stopband with < −18 dB attenuation up to 20 GHz.
References
-
-
1)
-
6. Wang, H., Zhu, L.: ‘Ultra-wideband bandpass filter using back-to-back microstrip-to-CPW transition structure’, Electron. Lett., 2005, 41, (24), pp. 1337–1338 (doi: 10.1049/el:20053466).
-
2)
-
4. Zhu, L., Wang, H.: ‘Ultra-wideband bandpass filter on aperture-backed microstrip line’, Electron. Lett., 2005, 41, (18), pp. 1015–1016 (doi: 10.1049/el:20052317).
-
3)
-
8. Abbosh, A.M.: ‘Design method for ultra-wideband bandpass filter with wide stopband using parallel-coupled microstrip lines’, IEEE Trans. Microw. Theory Tech., 2012, 60, (1), pp. 31–38 (doi: 10.1109/TMTT.2011.2175241).
-
4)
-
5. Yang, G.M., Jin, R.H., Geng, J.P.: ‘Planar microstrip UWB bandpass filter using U-shaped slot coupling structure’, Electron. Lett., 2006, 42, (25), pp. 1461–1463 (doi: 10.1049/el:20062284).
-
5)
-
3. Kuo, T., Lin, S., Chen, C.H.: ‘Compact ultra-wideband bandpass filters using composite microstrip – coplanar-waveguide structure’, IEEE Trans. Microw. Theory Tech., 2006, 54, (10), pp. 3772–3778 (doi: 10.1109/TMTT.2006.881624).
-
6)
-
8. Bates, R.N.: ‘Design of microstrip spurline band-stop filters’, IEE J. Microw. Opt. Acoust., 1977, 1, pp. 209–214 (doi: 10.1049/ij-moa.1977.0029).
-
7)
-
26. Ahn, D., Park, J., Kim, C., Kim, J., Qian, Y., Itoh, T.: ‘A design of the low-pass filter using a novel microtrip defected ground structure’, IEEE Tans. Microw. Theory Tech., 2001, 49, (1), pp. 86–93 (doi: 10.1109/22.899965).
-
8)
-
H. Wang ,
L. Zhu
.
Ultra-wideband bandpass filter using back-to-back microstrip–CPW transition structure.
Electron. Lett.
,
24 ,
1337 -
1338
-
9)
-
A. Abbosh
.
Design method for ultra-wideband bandpass filter with wide stopband using parallel-coupled microstrip lines.
IEEE Trans. Microw. Theory Tech.
,
1 ,
31 -
38
-
10)
-
T.N. Kuo ,
S.C. Lin ,
C.H. Chen
.
Compact ultra-wideband bandpass filter using composite microstrip-coplanar-waveguide structure.
IEEE Trans. Microw. Theory Tech.
,
3772 -
3778
-
11)
-
G.M. Yang ,
R.H. Jin ,
J.P. Geng
.
Planar microstrip UWB bandpass filter using U-shaped slot coupling structure.
Electron. Lett.
,
25 ,
1461 -
1463
-
12)
-
1. Federal Communications Commission: ‘Revision of part 15 of the commission's rules regarding ultra-wideband transmission systems’. .
-
13)
-
D. Ahn ,
J.-S. Park ,
C.-S. Kim ,
Y. Qian ,
T. Itoh
.
A design of lowpass filter using the novel microstrip defected ground structure.
IEEE Trans. Microw. Theory Tech.
,
1 ,
86 -
93
-
14)
-
L. Zhu ,
H. Wang
.
Ultra-wideband bandpass filter on aperture backed microstrip line.
Electron. Lett.
,
18 ,
1015 -
1016
-
15)
-
R.N. Bates
.
Design of microstrip spurline bandstop filters.
IEE J. Microw. Opt. Acoust.
,
6 ,
209 -
214
http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2014.0202
Related content
content/journals/10.1049/joe.2014.0202
pub_keyword,iet_inspecKeyword,pub_concept
6
6