Abstract

A design of a planar dual-mode filter is proposed and developed for satellite and wireless communication systems. The novelty of the proposed structure consists of replacing simple diagonal design with a starlike one. This offers the ability of controlling the central frequency and the bandwidth. The filter was implemented on Rogers substrate with 10.8 dielectric constant. The proposed filter structure is 37% smaller in size in comparison with traditional dual mode filters.

© 2005 Optical Society of America

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References

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  1. I. Wolff, “Microstrip bandpass filter using degenerated modes of a microstrip ring resonator,” Electron. Lett. 8, 163-164 (1972).
    [CrossRef]
  2. M. Guglielmi and G. Gatti, “Experimental investigation of dual-mode microstrip ring resonators,” in Proceedings of 20th European Microwave Conference (Budapest, 1990), pp. 901-906.
  3. L. Zhu, P.-M. Wecowski, and K. Wu, “New planar dual-mode filter using cross-slotted patch resonator for simultaneous size and loss reduction,” IEEE Trans. Microwave Theory Tech. 47, 650-654 (1999).
    [CrossRef]
  4. A. Cassinese, F. Palomba, G. Pica, A. Andreone, and G. Panariello, “Dual mode cross-slotted filters realized with superconducting films,” App. Phys. Lett. 77, 4407-4409 (2000).
    [CrossRef]
  5. Sonnet Software, Inc. Sonnet Suites User’s Guide, 9.0 ed. (Sonnet Software, Inc., North Syracuse, NY, 2003).
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    [CrossRef]

App. Phys. Lett. (1)

A. Cassinese, F. Palomba, G. Pica, A. Andreone, and G. Panariello, “Dual mode cross-slotted filters realized with superconducting films,” App. Phys. Lett. 77, 4407-4409 (2000).
[CrossRef]

Electron. Lett. (2)

I. Wolff, “Microstrip bandpass filter using degenerated modes of a microstrip ring resonator,” Electron. Lett. 8, 163-164 (1972).
[CrossRef]

J. S. Hong and M. J. Lancaster, “Bandpass characteristics of new dual-mode microstrip square loop resonators,” Electron. Lett. 31, 891-892 (1995).
[CrossRef]

IEEE Trans. Microwave Theory Tech. (1)

L. Zhu, P.-M. Wecowski, and K. Wu, “New planar dual-mode filter using cross-slotted patch resonator for simultaneous size and loss reduction,” IEEE Trans. Microwave Theory Tech. 47, 650-654 (1999).
[CrossRef]

Proceedings of 20th European Microwave C (1)

M. Guglielmi and G. Gatti, “Experimental investigation of dual-mode microstrip ring resonators,” in Proceedings of 20th European Microwave Conference (Budapest, 1990), pp. 901-906.

Other (1)

Sonnet Software, Inc. Sonnet Suites User’s Guide, 9.0 ed. (Sonnet Software, Inc., North Syracuse, NY, 2003).

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Figures (4)

Fig. 1.
Fig. 1.

Traditional dual-mode filter layout and the progress of filter design. (a) Traditional dual-mode filter layout; (b) Layout of traditional design with a vertical cross; (c) Traditional design with fringe slots; (d) Star dual-mode bandpass filter.

Fig. 2.
Fig. 2.

Simulated frequency response of a dual-mode filter, with L1=25.75 mm. (a) insertion loss (S21) response; (b) return loss (S11) response.

Fig. 3.
Fig. 3.

Filter responses of (a) traditional filter design, (b) design with vertical cross, (c) design with fringe slots, and (d) final dual-mode filter design. In each design, S21 is shown in black; S11 is shown in blue.

Fig. 4.
Fig. 4.

The plot of the network analyser screen showing the filter frequency response: Magnitude of S11 and S21 (dB) versus frequency (GHz).

Tables (2)

Tables Icon

Table 1. Central frequencies and bandwidths of traditional filter design, design with vertical cross, design with fringe slots and final dual-mode filter design from simulation.

Tables Icon

Table 2. Filter size of traditional filter design, design with vertical cross, design with fringe slots and final dual-mode filter design based on our simulation.

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