Stripline doppler radar

• US 4,731,611 A
• Filed: 06/20/1984
• Issued: 03/15/1988
• Est. Priority Date: 06/21/1983
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Muller, Jorg, Reppekus, Andreas
• Primary Examiner(s): Tubbesing, T. H.
• Assistant Examiner(s): GREGORY, BERNARR E
• Application Number:
  US06/622,674
• Time in Patent Office: 1,364 Days
• Field of Search: 343/5 PD, 343/7 PF, 343/7.7, 343/8, 343/700 MS, 343/, 340/552, 340/554, 364/438, 333/202, 333/219, 333/235, 331/107 DP, 331/107 SL, 331/96, 342/27, 342/28, 342/104
• US Class Current: 342/28
• CPC Class Codes: G01S 7/032 Constructional details for solid-state radar subsystems
• CPC Class Codes: H03B 2200/0024 including parallel striplines
• CPC Class Codes: H03B 2201/017 the element being a dielectric resonator
• CPC Class Codes: H03B 5/1841 the frequency-determining element being a strip line resonator H03B5/1805, H03B5/1817, H03B5/1864 and H03B5/1882 take precedence
• CPC Class Codes: H03B 5/1864 the frequency-determining element being a dielectric resonator

Abstract

A stripline Doppler Radar includes at least one high-frequency oscillator, a first stripline conductor connected to the oscillator, a second stripline conductor spaced from the first stripline conductor, at least one receiving diode connected to the second stripline conductor, an antenna connected to the second stripline conductor, low frequency external electrical terminals, filters connected between the stripline conductors and the external electrical terminals for inhibiting leakage of high-frequency power through the external electrical terminals, and a dielectric resonator adjustable in position from a location between the stripline conductors to a location partially covering one of the stripline conductors for conducting power delivered by the oscillator through the stripline conductors and the dielectric resonator to the receiving diode and the antenna, and for adjusting power radiated through the antenna, power received through the antenna and power transmitted from the oscillator through the resonator directly to the receiving diode.

Claims

1. Stripline Doppler Radar, comprising at least one high-frequency oscillator, a first stripline conductor connected to said oscillator, a second stripline conductor spaced from said first stripline conductor, at least one receiving diode connected to said second stripline conductor, an antenna connected to said second stripline conductor, low frequency external electrical terminals, filters connected between said stripline conductors and said external electrical terminals for inhibiting leakage of high-frequency power through said external electrical terminals, and a dielectric resonator adjustable to an optimal position in a range from a location between said stripline conductors to a location partially covering one of said stripline conductors for conducting power delivered by said oscillator through said stripline conductor and said dielectric resonator to said receiving diode and said antenna, and wherein the ratio between the power received through the antenna and the power transmitted from said oscillator through said resonator directly to said receiving diode is such that optimal sensitivity of the doppler radar is attained.

2. Stripline Doppler radar according to claim 1, wherein said filters are band rejection filters.

3. Stripline Doppler radar according to claim 1, wherein said filters are lowpass filters.

4. Stripline Doppler radar according to claim 1, including an insulating substrate, said stripline conductors, resonator, oscillator, receiving diode and filters being disposed in common on said substrate.

5. Stripline Doppler radar according to claim 1, wherein said oscillator has a high-frequency output and said first stripline conductor has one end connected to said high-frequency output and another end, and including a terminating resistor connected to the other end of said first stripline conductor.

6. Stripline Doppler radar according to claim 5, including a substrate on which said stripline conductors are disposed, said terminating resistor being in the form of a resistance film disposed on said substrate.

7. Stripline Doppler radar according to claim 1, wherein said second stripline conductor is conductively connected to said antenna and to said receiving diode.

8. Stripline Doppler radar according to claim 1, wherein said oscillator is in the form of an IMPATT diode.

9. Stripline Doppler radar according to claim 1, wherein said oscillator is in the form of a BARITT diode.

10. Stripline Doppler radar according to claim 1, wherein said oscillator is in the form of a field-effect transistor.

11. Stripline Doppler radar according to claim 1, wherein said oscillator is in the form of a Gunn element.

12. Stripline Doppler radar according to claim 1, wherein said receiving diode is in the form of a Schottky diode.

13. Stripline Doppler radar according to claim 1, wherein said oscillator is a Gunn element, said receiving diode is a Schottky diode, said resonator is coupled to said Gunn element and to said Schottky diode at given points, and the optimum line lengths between said coupling points are substantially between λ

/4 and λ

/2 where λ

is the line wavelength of the center of gravity frequency of a corresponding frequency band generated in said Doppler radar.

14. Stripline Doppler radar according to claim 1, including a housing formed of electrically conductive material, said electrical terminals being in the form of electrically insulated feedthroughs passing through said housing.

15. Stripline Doppler radar according to claim 1, including a tuning screw disposed above said resonator for frequency tuning said resonator.

16. Stripline Doppler radar according to claim 1, wherein said resonator has geometric dimensions being adjusted for frequency tuning said resonator by means of material removal.

17. Stripline Doppler radar according to claim 1, wherein said resonator includes layers having different dielectric constants frequency tuning said resonator.

18. Stripline Doppler radar according to claim 17, wherein said layers are formed of a material selected from the group consisting of epoxy resins, polyesters and arcylic resins.

19. Stripline Doppler radar according to claim 18, wherein said layers are enriched with dielectric fillers selected from the group consisting of titanium dioxide, Al₂ O₃, barium tetratitanate, and zirconium-titanium-tin-oxygen compound having the formula (Zr_x Ti_y Sn_z)O₄, wherein x+y+z=2 and wherein x, y and z are positive integers or 0.

20. Stripline Doppler radar according to claim 19, wherein at least one of said fillers and resonator are formed of a material from the group consisting of Al₂ O₃, barium tetratitanite, and a zirconium-titanium-tin-oxygen compound with the formula:

space="preserve" listing-type="equation">(Zr.sub.x Ti.sub.y Sn.sub.z)O.sub.4, wherein x+y+z=2, --

wherein x, y and z are positive integers or 0.

21. Stripline Doppler radar according to claim 1, wherein said resonator includes layers having different thicknesses frequency tuning said resonator.

22. Stripline Doppler radar according to claim 21, wherein said layers are formed of a material selected from the group consisting of epoxy resins, polyesters and acrylic resins.

23. Stripline Doppler radar according to claim 22, wherein said layers are enriched with dielectric fillers selected from the group consisting of titanium dioxide, Al₂ O₃, barium tetratitanate, and zirconium-titanium-tin-oxygen compound having the formula (Zr_x Ti_y Sn_z)O₄, wherein x+y+z=2 and wherein x, y and z are positive integers or 0.

24. Stripline Doppler radar according to claim 23, wherein at least one of said fillers and resonator are formed of a material form the group consisting of Al₂ O₃, barium tetratinatite, and a zirconium-titanium-tin-oxygen compound with the formula:

space="preserve" listing-type="equation">(Zr.sub.x Ti.sub.y Sn.sub.z)O.sub.4, wherein x+y+z=2,

wherein x, y and z are positive integers or 0.

25. Stripline Doppler radar according to claim 1, wherein said resonator is cylindrical.

26. Stripline Doppler radar according to claim 1, wherein at least one of said resonator is formed of a material from the group consisting of Al₂ O₃, barium tetratinatite, and a zirconium-titanium-tin-oxygen compound with the formula:

space="preserve" listing-type="equation">(Zr.sub.x Ti.sub.y Sn.sub.z)O.sub.4, wherein x+y+z=2,

wherein x, y and z are positive integers or 0.