Patent EP0604203A2 successfully refreshed from Google Patents.
EP0604203A2
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EP
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Wide band flat power detector
Assignee: Harris Corp
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Filing: 1993-12-21
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Granted: —
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Expires: 2013-12-21
Abstract
Abstract A wideband detector having a substantially flat response is made by using the signal at the isolation (15) port of a coupler (11,13). As the response or transfer characteristic at the isolation port is substantially linear, a matching network (23) having the inverse or opposite transfer characteristic with respect to frequency may be connected to the coupler. The addition of the matching network transfer characteristic to the transfer characteristic of the coupler in the isolation port produces a superposition. The matching network transfer characteristic compensates for the linear varying transfer characteristic at the coupler isolation port to produce a substantially flat output of the matching network. The detector (25) connected to the matching network output will then produce a detector signal which is substantially flat over the frequency range of the bandspread of interest.
Inventors
- 👤 James A. Leanes
- 👤 Wang Chiu Wu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:49
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/10; G01R21/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
Claim 1 A broadband power detector coupled to a power source and producing a flat output signal with respect to frequency and indicative of the power of said power source over a finite width frequency band comprising a directional coupling means having a primary and secondary circuit and, within said secondary circuit, an isolation port and coupling port; said coupling means coupling said power source to said isolation port, said primary circuit connected to a load having an impedance matching the output impedance of the primary circuit, a matching network having an input port and output port; said matching network input port connected to said coupling means isolation port, said coupling network producing an output signal at said isolation port which varies substantially linearly with respect to frequency over said finite frequency band, said matching network having an input to output port response which compensates for said substantially linear variation of said isolation port output signal with respect to frequency, and said matching network producing a flat output signal which is substantially invariant with respect to frequency over said finite frequency band.
Claim 2
Dependent Claim
54 words
Claim 2 A power detector as claimed in claim 1 wherein said input to output responses of said matching network over said finite width frequency band is the opposite to, or the inverse of, said linearly varying output signal with respect to frequency over said finite frequency band, of said coupling means isolation port.
Claim 3
Dependent Claim
29 words
Claim 3 A power detector as claimed in claim 1 or 2, wherein said directional coupling means has a matched impedance connected to said directional coupling means coupling port.
Claim 4
Dependent Claim
51 words
Claim 4 A power detector as claimed in any one of claims 1 to 3 including a detector means connected to said matching network output port and said detector produces a signal indicative of power from said power source in response to said matching network output signal at said output port.
Claim 5
Dependent Claim
32 words
Claim 5 A power detector as claimed in claim 4 wherein said detector is a diode detector, said diode detector has an internal junction capacitance and said matching network includes junction capacitance.
Claim 6
Dependent Claim
53 words
Claim 6 A power detector as claimed in any one of claims 1 to 5 wherein said power source produces a primary current in said coupling means secondary circuit propagating in a direction toward said coupling port and a secondary current in said coupling means propagating in a direction toward said isolation port.
Claim 7
Dependent Claim
53 words
Claim 7 A power detector as claimed in claim 6 wherein said power source produces a current in said coupling means primary circuit; and said secondary current in said coupling means in said secondary circuit propagates substantially in the direction of said current in said coupling means primary circuit, as a reflected wave.
Claim 8
Dependent Claim
42 words
Claim 8 A power detector as claimed in claim 7 wherein said output signal at said isolation port increases with respect to increasing frequency and said matching network input to output port response is a decreasing response with respect to increasing frequency.
Claim 9
Dependent Claim
39 words
Claim 9 A power detector as claimed in claim 8 wherein said matching network response decreases at a rate which is substantially that of the rate of increase of said isolation port output signal with respect to increasing frequency.
Claim 10
Dependent Claim
170 words
Claim 10 A method of producing a power indicative signal which is flat with respect to frequency over a finite width frequency band, comprising the steps of connecting a primary circuit of a directional coupler to a source of power having frequencies varying over a finite width frequency band, connecting the output port of said primary circuit to a matched impedance, producing a signal at said coupler isolation port with respect to the frequency of said power source, over said finite width frequency band, connecting the coupling port of the secondary circuit of said directional said coupler to a matched impedance and the isolation port of said coupler to a matching network, connecting the signal at the output of said isolation port to said matching network which has a linear transfer characteristic with respect to frequency and which compensates for said linearly varying output at said isolation port; and producing a flat output signal with respect to frequency over said finite frequency bandwidth, at the output of said matching network.
Claim 11
Dependent Claim
41 words
Claim 11 A method as claimed in claim 10 including the step of using a matching network having a decreasing slope linear transfer characteristic with respect to increasing frequency where the output at said isolation port increases linearly with increasing frequency.
Claim 12
Dependent Claim
35 words
Claim 12 A method as claimed in Claim 11 including the step of connecting a diode detector to the said output signal at the output of said matching network to produce said power indicative signal.
Claim 13
Dependent Claim
26 words
Claim 13 A method as claimed in claim 12 including the step of making the junction capacitance of said diode detector part of said matching network.
Claim 14
Dependent Claim
41 words
Claim 14 A method as claimed in claim 13 including the step of inducing a current flow in the secondary circuit of the coupler and transmitting the current induced in the secondary circuit of said coupling means to said matching network.
References Cited (Backward Citations)
US5159298A
Cited
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