Second harmonic filter for high frequency source
阅读：238发布：2021-12-30
专利汇可以提供Second harmonic filter for high frequency source专利检索，专利查询，专利分析的服务。并且A second harmonic filter for a doppler radar intrusion system or the like which includes a cavitiy with an elongated coupling port containing an active device for generating microwave energy which is radiated through the cavity through the coupling port. In one embodiment the second harmonic filter includes a dielectric sheet which bridges the coupling port and which supports a resonant tuning stab. The resonant tuning stub is positioned orthogonal to the elongated dimension of the coupling port and is spaced from the coupling port. The tuning stub forms a capacitor with the coupling port and is dimensioned so as to resonate at the second harmonic frequency to act as a band stop filter at that frequency. In a second embodiment, the elongated coupling port includes a pair of opposed projections positioned mid-way between the ends of the port to form a pair of inductors and a capacitor between them which acts as a band stop filter at the second harmonic frequency.，下面是Second harmonic filter for high frequency source专利的具体信息内容。
1. A high frequency system comprising: means for generating electromagnetic energy at a fundamental frequency and at the second harmonic frequency of the fundamental frequency including a housing having a port which is substantially dimensioned for transfer of said electromagnetic energy at the fundamental frequency therethrough but has at least one dimension which is a predetermined degree different than the optimum dimension for transfer of said electromagnetic energy at the fundamental frequency therethrough so that said port has a predetermined impedance value at the fundamental frequency; and filter means for attenuating said energy at the second harmonic frequency of said fundamental frequency including member means proximate to and extending transversely of said port being dimensioned to provide a value of inductance and capacitance for attenuating said energy at the second harmonic frequency, one of said values of inductance and capacitance of each member means being selected at least in part to offset said predetermined impedance value of said port at the fundamental frequency.
2. A high frequency system according to claim 1 wherein said member means is spaced from said port a predetermined distance and is dimensioned so as to form a resonant circuit at said second harmonic frequency for attenuating said energy at said second harmonic frequency.
3. A high frequency system according to claim 2 further including a dielectric member interposed between said filter means member and said port for supporting said filter means member in spaced relationship to said port and said housing.
4. A high frequency system according to claim 3 wherein said dielectric member is a flat sheet.
5. A high frequency system according to claim 4 wherein said filter means member comprises a mEtallic material disposed on said flat sheet.
6. A high frequency system according to claim 5 wherein said sheet has a predetermined thickness for spacing said filter means member said predetermined distance.
7. A high frequency system according to claim 6 wherein said filter means member has a predetermined area confronting said port so that said predetermined distance establishes resonance at the second harmonic frequency to attenuate said second harmonic energy.
8. A high frequency system according to claim 1 wherein said member means comprises a projection from said housing.
9. A high frequency system according to claim 8 wherein said projection has a surface capacitively coupled to said housing to provide said capacitance value and a projecting dimension to provide said inductance value.
10. A high frequency system according to claim 9 wherein said projection is disposed at least partly within said port.
11. A high frequency system according to claim 10 wherein said projection is disposed wholly within said port.
12. A high frequency system according to claim 8 wherein said member means comprises a second projection from said housing opposing said first mentioned projection.
13. A high frequency system according to claim 12 wherein each of said projections has a surface confronting the surface of the other to provide said capacitance value and each of said projections has projecting dimensions to provide said inductance value.
14. A high frequency system according to claim 13 wherein said projections are disposed at least partly within said port.
15. A high frequency system according to claim 14 wherein said projections are disposed wholly within said port.
16. A doppler intrusion alarm system comprising: means for generating electromagnetic energy at a fundamental frequency and at the second harmonic frequency of the fundamental frequency including a housing having a port which is substantially dimensioned for transfer of said electromagnetic energy at the fundamental frequency therethrough but has at least one dimension which is a predetermined degree different than the optimum dimension for transfer of said electromagnetic energy at the fundamental frequency therethrough so that said port has a predetermined impedance value at the fundamental frequency; filter means for attenuating said energy at the second harmonic frequency of said fundamental frequency including member means proximate to and extending transversely of said port being dimensioned to provide a value of inductance and capacitance for attenuating said energy at the second harmonic frequency, one of said values of inductance and capacitance of each member means being selected at least in part to offset said predetermined impedance value of said port at the fundamental frequency; means for radiating said generated electromagnetic energy and for receiving a reflected portion of said radiated energy; and receiver means for detecting a frequency difference between said generated energy and said reflected portion of said generated energy whereby the movement of an intruder may be detected and an alarm may be provided.
17. A doppler intrusion alarm system according to claim 16 wherein said member means is spaced from said port a predetermined distance and is dimensioned so as to form a resonant circuit at said second harmonic frequency for attenuating said energy at said second harmonic frequency.
18. A doppler intrusion alarm system according to claim 17 further including a dielectric member interposed between said filter means member and said port for supporting said filter means member in spaced relationship to said port and said housing.
19. A doppler intrusion alarm system according to claim 18 wherein said dielectric member is a flat sheet.
20. A doppler intrusion alarm system according to claim 19 wherein said filter means member comprises a metallic material disposed on said flat sheet.
21. A doppler intrusion alarm systEm according to claim 20 wherein said sheet has a predetermined thickness for spacing said filter means member said predetermined distance.
22. A doppler intrusion alarm system according to claim 21 wherein said filter means member has a predetermined area confronting said port so that said predetermined distance establishes resonance at the second harmonic frequency to attenuate said second harmonic energy.
23. A doppler intrusion alarm system according to claim 16 wherein said filter means member means comprises a projection from said housing.
24. A doppler intrusion alarm system according to claim 23 wherein said projection has a surface capacitively coupled to said housing to provide said capacitance value and a projecting dimension to provide said inductance value.
25. A doppler intrusion alarm system according to claim 24 wherein said projection is disposed at least partly within said port.
26. A doppler intrusion alarm system according to claim 25 wherein said projection is disposed wholly within said port.
27. A doppler intrusion alarm system according to claim 23 wherein said member means includes a second projection from said housing opposing said first mentioned projection.
28. A doppler intrusion alarm system according to claim 27 wherein each of said projections has a surface confronting the surface of the other to provide said capacitance value and each of said projections has projecting dimensions to provide said inductance value.
29. A doppler intrusion alarm system according to claim 28 wherein said projections are disposed at least partly within said port.
30. A doppler intrusion alarm system according to claim 29 wherein said projections are disposed wholly within said port.
31. A high frequency system according to claim 1 wherein said member means is disposed at least partly within said port.
32. A high frequency system according to claim 1 wherein said member means is disposed wholly within said port.
33. A high frequency system according to claim 1 wherein said member means is disposed wholly outside of said port.
34. A doppler intrusion alarm system according to claim 16 wherein said member means is disposed at least partly within said port.
35. A doppler intrusion alarm system according to claim 16 wherein said member means is disposed wholly within said port.
36. A doppler intrusion alarm system according to claim 16 wherein said member means is disposed wholly outside of said port.
37. A doppler intrusion alarm system according to claim 16 wherein said port has at least one dimension which is a predetermined degree lesser than the optimum dimension for transfer of said energy at the fundamental frequency therethrough so that said port has an inductance value at the fundamental frequency, and wherein said capacitance value of said member means is selected at least in part to offset said inductance value of said port at the fundamental frequency.
38. A high frequendy system according to claim 1 further including a dielectric member interposed between said filter means member and said port for supporting said filter means member in spaced relationship to said port and said housing.
39. A high frequency system according to claim 38 wherein said dielectric member is a flat sheet.
40. A high frequency system according to claim 39 wherein said filter means member comprises a metallic material disposed on said flat sheet.
41. A high frequency system according to claim 40 wherein said sheet has a predetermined thickness for spacing said filter means member said predetermined distance.
42. A high frequency system according to claim 41 wherein said filter means member has a predetermined area confronting said port so that said predetermined distance establishes resonance at the second harmonic frequency to attenuate said energy at the second harmonic.
43. A high frequency system comprising: means for generating electromagnetic energy at a fundamental frequency and at the second harmoNic frequency of the fundamental frequency including a housing having a port for transfer of said electromagnetic energy at the fundamental frequency therethrough; and filter means for attenuating said energy at the second harmonic frequency of said fundamental frequency including first and second opposed projections from said housing proximate to and extending transversely of said port being dimensioned to provide a value of inductance and capacitance for attenuating said energy at the second harmonic frequency.
44. A high frequency system according to claim 43 wherein each of said projections has a surface confronting the surface of the other to provide said capacitance value and each of said projections has projecting dimensions to provide said inductance value.
45. A high frequency system according to claim 43 wherein said projections are disposed at least partly within said port.
46. A high frequency system according to claim 43 wherein said projections are disposed wholly within said port.
47. A high frequency system according to claim 43 wherein said projections are disposed wholly outside of said port.
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