US5101181A
Expired / Lapsed
US
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Logarithmic-periodic microwave multiplexer
Assignee: United States Department of the Navy
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Filing: 1990-06-12
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Granted: 1992-03-31
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Expires: 2010-06-12
Abstract
Abstract A multiport microwave multiplexer having components which are log-periodically scaled structures is shown and described. Circuit parameter values and characteristic frequencies are determined and a first output port is linked by a constant ratio to corresponding quantities that define the response of other networks. A capacitively end-coupled channelizer filter is used for each channel of the multiplexer.
Inventors
- 👤 Christen Rauscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:54
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
58 words
A multiport microwave frequency multiplexer comprising: an input port; at least two output ports; a first group of frequency sensitive components connecting said input port and said output ports, said frequency sensitive components forming a log-periodically scaled structure; and at least two low-pass filter structures being located between said input port and said at least two output ports.
Claim 2
Dependent Claim
58 words
A multiport microwave frequency multiplexer comprising: an input port; at least two output ports; a first group of frequency sensitive components connecting said input port and said output ports, said frequency sensitive components forming a log-periodically scaled structure; and at least two low-pass filter structures being located between said input port and said at least two output ports.
Claim 3
Dependent Claim
21 words
The multiplexer of claim 1 wherein there is at least one transmission line stub in each of said low-pass filter structures.
Claim 4
Dependent Claim
29 words
The multiplexer of claim 1 wherein said low-pass filter structure comprises a second group of frequency sensitive components which are each log-periodic scaled functions of other low-pass filter structures.
Claim 5
Dependent Claim
24 words
The multiplexer of claim 3 wherein said low-pass filter structure comprises frequency selective components which are log-periodically scaled functions of output-port frequency sensitive components.
Claim 6
Dependent Claim
23 words
The multiplexer of claim 1 further comprising equivalent substitution network means for simulating omitted segments of the log-periodically scaled structure at its input.
Claim 7
Dependent Claim
15 words
The multiplexer of claim 5 wherein said equivalent substitution network means comprises a two-port network.
Claim 8
Dependent Claim
22 words
The multiplexer of claim 1 further comprising equivalent substitution network means for simulating segments of the log-periodically scaled structure at a termination.
Claim 9
Dependent Claim
23 words
The multiplexer of claim 1 further comprising feedback circuitry for feeding signals from said output ports back to other ports in the multiplexer.
Claim 10
Dependent Claim
18 words
The multiplexer of claim 1 further comprising feedback circuitry connected between said output ports and said input port.
Claim 11
Dependent Claim
51 words
The multiplexer of claim 1 further comprising a trunk feeder network connected to at least one channelized filter, said channelized filter being connected to respective ones of said output ports, said trunk feeder comprising a cascade connection of filter sections, and said filter sections comprising scaled log-periodic functions of each other.
Claim 12
Dependent Claim
41 words
The multiplexer of claim 1 further comprising a trunk feeder network for distributing input port signals of the multiplexer to frequency-selective subcircuits that define each output frequency band, and wherein said trunk feeder network comprises a cascade of log-periodic filter elements.
Claim 13
Dependent Claim
33 words
The multiplexer of claim 1 wherein each of said output ports is connected to a channelizer filter including one output port having series-resonant-type driving-point impedance characteristics in the vicinity of channel passband frequencies.
Claim 14
Dependent Claim
25 words
The multiplexer of claim 1 wherein each of said output ports comprises a port of a circuit comprising a capacitively end-coupled transmission line channelizer filter.
Claim 15
Dependent Claim
20 words
The multiplexer of claim 13 wherein said capacitively end-coupled transmission line filter includes at least one transmission line resonator section.
Claim 16
Dependent Claim
34 words
The multiplexer of claim 13 wherein said capacitively end-coupled transmission line filter further comprises a means for moving unwanted parasitic passbands to higher frequencies away from the principal passband of said transmission line filter.
Claim 17
Dependent Claim
25 words
The multiplexer of claim 14 wherein said transmission line resonator section comprises a low-impedance input section, a high-impedance center section, and a low-impedance output section.
Claim 18
Dependent Claim
17 words
The multiplexer of claim 14 wherein said transmission line resonator section comprises a low-high-low characteristic impedance profile.
Claim 19
Dependent Claim
13 words
The multiplexer of claim 15 wherein there are two transmission line resonator sections.
Claim 20
Dependent Claim
54 words
A multiport microwave frequency multiplexer comprising: an input port; at least two output ports; frequency sensitive components connecting said input port and said output ports, said frequency sensitive components forming a log-periodically scaled structure; and a low-pass filter structure being located between said input port and one of said at least two output ports.
Claim 21
Dependent Claim
54 words
A multiport microwave frequency multiplexer comprising: an input port; at least two output ports; frequency sensitive components connecting said input port and said output ports, said frequency sensitive components forming a log-periodically scaled structure; and a low-pass filter structure being located between said input port and one of said at least two output ports.
Claim 22
Dependent Claim
33 words
The multiplexer of claim 19 wherein each of said output ports is connected to a channelizer filter including one output port having series-resonant-type driving-point impedance characteristics in the vicinity of channel passband frequencies.
Claim 23
Dependent Claim
25 words
The multiplexer of claim 19 wherein each of said output ports comprises a port of a circuit comprising a capacitively end-coupled transmission line resonator section.
Claim 24
Dependent Claim
20 words
The multiplexer of claim 21 wherein said capacitively end-coupled transmission line filter includes at least one transmission line resonator section.
Claim 25
Dependent Claim
34 words
The multiplexer of claim 21 wherein said capacitively end-coupled transmission line filter further comprises a means for moving unwanted parasitic passbands to higher frequencies away from the principal passband of said transmission line filter.
Claim 26
Dependent Claim
25 words
The multiplexer of claim 23 wherein said transmission line resonator section comprises a low-impedance input section, a high-impedance center section, and a low-impedance output section.
Claim 27
Dependent Claim
17 words
The multiplexer of claim 21 wherein said transmission line resonator section comprises a low-high-low characteristic impedance profile.
Claim 28
Dependent Claim
13 words
The multiplexer of claim 22 wherein there are two transmission line resonator sections.
Claim 29
Dependent Claim
35 words
A multiport microwave frequency multiplexer comprising: a logarithmic periodic structure, said structure comprising: a trunk line; and a plurality of channelizer filters; wherein said trunk line further comprises at least one frequency sensitive filter component.
Claim 30
Dependent Claim
35 words
A multiport microwave frequency multiplexer comprising: a logarithmic periodic structure, said structure comprising: a trunk line; and a plurality of channelizer filters; wherein said trunk line further comprises at least one frequency sensitive filter component.
Claim 31
Independent Claim
99 words
A method of constructing a microwave multiplexer circuit having an input and at least one output, comprising the steps of: selecting an output frequency band for each output port; selecting components of said multiplexer circuit so as to form an assembly of log-periodically scaled subcircuits, with one port of each such subcircuit being an output port; placing a capacitively end-coupled transmission line channelizer filter in each multiplexer subcircuit; incorporating in each of said subcircuits, sections which are connected to said channelizer filters; and placing low-pass filter sections between each subcircuit, and log-periodically scaling components of said low-pass filter sections.
Claim 32
Independent Claim
99 words
A method of constructing a microwave multiplexer circuit having an input and at least one output, comprising the steps of: selecting an output frequency band for each output port; selecting components of said multiplexer circuit so as to form an assembly of log-periodically scaled subcircuits, with one port of each such subcircuit being an output port; placing a capacitively end-coupled transmission line channelizer filter in each multiplexer subcircuit; incorporating in each of said subcircuits, sections which are connected to said channelizer filters; and placing low-pass filter sections between each subcircuit, and log-periodically scaling components of said low-pass filter sections.
Claim 33
Dependent Claim
26 words
The method of constructing a microwave multiplexer of claim 28 wherein a barbell transmission line segment is provided as a means for shifting a parasitic passband.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |