Bandstop response of microstrip stepped impedance ring with rotational symmetry

X.H. Jin; X.D. Huang; C.H. Cheng

Bandstop response of microstrip stepped impedance ring with rotational symmetry

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Author(s): X.H. Jin ¹ ; X.D. Huang ¹ ; C.H. Cheng ¹
- Affiliations: 1: College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Mailbox 280, 66 Xinmofan Road, Nanjing 210003, People's Republic of China
Source: Volume 49, Issue 2, 17 January 2013, p. 121 – 123
DOI: 10.1049/el.2012.4151 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 27/11/2012, Published

The bandstop behaviour of a stepped impedance microstrip ring is studied. The ring is composed of four sections of microstrip line, which are equal in electrical length, but different in impedance. When the impedances of the lines meet the condition of rotational symmetry, a bandstop response could be obtained. At the central frequency of the stopband, the electrical length of the lines is 90°. By tuning the lines' impedances, the bandwidth could be finely adjusted, typically from 0.5 to 40%. Prototypes are designed, fabricated and measured. Good agreements are observed between the measured and the simulated data. The measured data shows that the 3 dB bandwidth is 24%, with a rejection level of −32 dB at the central frequency 1.99 GHz. In addition, the measured matching within the passband is good, as predicted.

References

1. 1)
  - 1. Matthaei, G.L, Young, L., Jones, E.M.T.: ‘Microwave filters, impedance matching networks, and coupling structures’ (Artech House, Norwood, MA, 1980).
2. 2)
  - 5. Her, M.L., Lin, Q.M., Lin, K.Y., Wu, Y.D., Wang, Y.L.: ‘Dual-mode transmission-zeros bandstop ﬁlters with closed-loop ring resonators’, Microw. Opt. Technol. Lett., 2005, 44, (1), pp. 114–118 (doi: 10.1002/mop.20562).
3. 3)
  - 3. Gopalakrishnan, G.K., Chang, K.: ‘Novel excitation schemes for the microstrip ring resonator with lower insertion loss’, Electron. Lett., 1994, 30, (2), pp. 148–149 (doi: 10.1049/el:19940108).
4. 4)
  - 2. Olvera-Cervantes, J.L., Corona-Chavez, A., Murthy, D.V.B. : ‘Novel compact size bandstop filter with storted-stub loaded ring resonator’, Microw. Opt. Technol. Lett., 2011, 53, (12), pp. 2766–2768 (doi: 10.1002/mop.26439).
5. 5)
  - 4. Hsieh, L.H., Chang, K.: ‘Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters’, IEEE Trans. Microw. Theory Tech., 2003, 51, (4), pp. 1241–1246 (doi: 10.1109/TMTT.2003.809643).
6. 6)
  - 6. Gómez-García, R., Alonso, J.I.: ‘Design of sharp-rejection and low-loss wide-band planar filters using signal-interference techniques’, IEEE Microw. Wirel. Compon. Lett., 2005, 15, (8), pp. 530–532 (doi: 10.1109/LMWC.2005.852797).
7. 7)
  - J.L. Olvera-Cervantes , A. Corona-Chavez , D.V.B. Murthy . Novel compact size bandstop filter with storted-stub loaded ring resonator. Microw. Opt. Technol. Lett. , 12 , 2766 - 2768
8. 8)
  - R. Gomez-Garcia , J.I. Alonso . Design of sharp-rejection and low-loss wide-band planar filters using signal-interference techniques. IEEE Microw. Wirel. Compon. Lett. , 8 , 530 - 532
9. 9)
  - G.K. Gopalakrishnan , K. Chang . Novel excitation schemes for the microstrip ring resonator with lower insertion loss. Electron. Lett. , 148 - 149
10. 10)
  - G.L. Matthaei , L. Young , E.M.T. Jones . (1964) Microwave filters, impedance matching networks, and coupling structures.
11. 11)
  - L.H. Hsieh , K. Chang . Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters. IEEE Trans. Microw. Theory Tech , 4 , 1241 - 1246
12. 12)
  - M.L. Her , Q.M. Lin , K.Y. Lin , Y.D. Wu , Y.L. Wang . Dual-mode transmission-zeros bandstop ﬁlters with closed-loop ring resonators. Microw. Opt. Technol. Lett. , 1 , 114 - 118

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Bandstop response of microstrip stepped impedance ring with rotational symmetry

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