Claims
- 1. A dual mode resonator for resonating two microwave signals, comprising:a one-wavelength loop-shaped strip line having a uniform line impedance for resonating a first microwave signal according to a first resonance mode and resonating a second microwave signal according to a second resonance mode orthogonal to the first resonance mode, electric voltage induced by the first microwave signal being maximized at a first coupling point A and a second coupling point B spaced 180 degrees in electric length apart from the first coupling point A, and electric voltage induced by the second microwave signal being maximized at a third coupling point C spaced 90 degrees in electric length apart from the first coupling point A and a fourth coupling point D spaced 180 degrees in electric length apart from the third coupling point C; a first open-end coupling strip line, placed in an inside area surrounded by the one-wavelength loop-shaped strip line, for electromagnetically influencing the first microwave signal; a second open-end coupling strip line, placed in the inside area of the one-wavelength loop-shaped strip line, for electromagnetically influencing the first microwave signal, electromagnetic characteristics of the second open-end coupling strip line being the same as those of the first open-end coupling strip line, the first and second open-end coupling strip lines being coupled to each other to form a capacitor having a distributed capacity, wherein the first and second open-end coupling strip lines are parallel to each other and open ends of the first and second open-end coupling strip lines are directed in the same direction; a first lead-in strip line for connecting the first open-end coupling strip line to the first coupling point A of the one-wavelength loop-shaped strip line to lead the first microwave signal in the first open-end coupling strip line; and a second lead-in strip line for connecting the second open-end coupling strip line to the second coupling point B of the one-wavelength loop-shaped strip line to lead the first microwave signal in the second open-end coupling strip line.
- 2. A dual mode resonator for resonating two microwave signals, comprising:a one-wavelength loop-shaped strip line having a uniform line impedance for resonating a first microwave signal according to a first resonance mode and resonating a second microwave signal according to a second resonance mode orthogonal to the first resonance mode, electric voltage induced by the first microwave signal being maximized at a first coupling point A and a second coupling point B spaced 180 degrees in electric length apart from the first coupling point A, and electric voltage induced by the second microwave signal being maximized at a third coupling point C spaced 90 degrees in electric length apart from the first coupling point A and a fourth coupling point D spaced 180 degrees in electric length apart from the third coupling point C; a first open-end coupling strip line, placed in an inside area surrounded by the one-wavelength loop-shaped strip line, for electromagnetically influencing the first microwave signal, wherein the first open-end coupling strip line includes two first open-ends; a second open-end coupling strip line, placed in the inside area of the one-wavelength loop-shaped strip line, for electromagnetically influencing the first microwave signal, electromagnetic characteristics of the second open-end coupling strip line being the same as those of the first open-end coupling strip line, wherein the second open-end coupling strip line includes two second open-ends, the first and second open-end coupling strip lines being parallel to each other to be coupled to each other and to form a capacitor having a distributed capacity; a first lead-in strip line for connecting the first open-end coupling strip line to the first coupling point A of the one-wavelength loop-shaped strip line to lead the first microwave signal in the first open-end coupling strip line; and a second lead-in strip line for connecting the second open-end coupling strip line to the second coupling point B of the one-wavelength loop-shaped strip line to lead the first microwave signal in the second open-end coupling strip line.
- 3. A dual mode resonator according to claim 2 in which the first open-end coupling strip line and the second open-end coupling strip line are extended straight.
- 4. A dual mode resonator according to claim 2 in which the first open-end coupling strip line and the second open-end coupling strip line are respectively in a comb-teeth shape.
- 5. A dual mode resonator according to claim 2 in which the first open-end coupling strip line and the second open-end coupling strip line are respectively in a wave shape.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-189496 |
Aug 1994 |
JP |
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Parent Case Info
This is a Division of application Ser. No. 08/980,478 filed Nov. 28, 1997 now U.S. Pat. No. 5,850,656, which is a divisional application of Ser. No. 08/775,772 now U.S. Pat. No. 5,748,059 filed Dec. 31, 1996 which is a divisional application of Ser. No. 08/598,541 now U.S. Pat. No. 5,684,440, filed Feb. 8, 1996, which in turn is a divisional application of Ser. No. 08/317,505 filed Oct. 4, 1994 now U.S. Pat. No. 5,534,837.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0573985A1 |
Dec 1993 |
EP |
2248621 |
May 1975 |
FR |
2222312A |
Feb 1990 |
GB |
2284402 |
Sep 1991 |
JP |
Non-Patent Literature Citations (4)
Entry |
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IEEE Proceedings H. Microwaves, Antennas & Propagation, vol. 138, No. 4, Aug. 1991, Stevenage GB, pp. 383-385, S. H. Al-Charchafchi et al., “Study of Varactor tuned Microstrip Rhombic Resonators”. |
“Miniature Dual Mode Microstrip Filters” by Curtis et al. 1991 IEEE MTT-S Digest; pp., 443-446. |
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