US3710272A
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Multi-stage type microwave amplifier
Assignee: NEC Corp
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Filing: 1971-10-04
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Granted: 1973-01-09
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Expires: 1991-10-04
Abstract
Abstract A microwave amplifier comprising a plurality of amplifier units connected in cascade fashion. Each of the amplifier units have substantially similar gain versus frequency characteristics, which characteristics are substantially flat over the entire operating frequency range. The units are connected by lines which in the microwave amplifier embodiment may be strip lines having electrical lengths which are selected in accordance with any one of a group of predetermined equations so as to provide a multistage microwave amplifier whose resultant gain versus-frequency characteristic is likewise substantially flat over the entire operating frequency range.
Inventors
- 👤 K Ayaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:26
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A multi-stage type microwave amplifier formed by connecting (2m+1) unit amplifiers (m being any integer equal to or greater than 1) having substantially equal gain versus frequency characteristics in cascade, in which a first group of m lines having respectively arbitrary electrical lengths of theta 1, theta 2, . . . theta m are inserted one by one at m locations between each of a selected group of said unit amplifiers, and a second group of lines having electrical lengths given by theta 1 + pi /2 (2m1 - 1), 2 + pi /2 (2m2- 1), . . . theta m + pi /2 (2mm- 1) (m1, m2, . . . mm being integers equal to or greater than one) at a frequency near the center of the amplification band are inserted one by one between the remaining unit amplifiers.
Claim 2
Dependent Claim
140 words
A multi-stage type microwave amplifier formed by connecting (2m+1) unit amplifiers (m being any integer equal to or greater than 1) having substantially equal gain versus frequency characteristics in cascade, in which a first group of m lines having respectively arbitrary electrical lengths of theta 1, theta 2, . . . theta m are inserted one by one at m locations between each of a selected group of said unit amplifiers, and a second group of lines having electrical lengths given by theta 1 + pi /2 (2m1 - 1), 2 + pi /2 (2m2- 1), . . . theta m + pi /2 (2mm- 1) (m1, m2, . . . mm being integers equal to or greater than one) at a frequency near the center of the amplification band are inserted one by one between the remaining unit amplifiers.
Claim 3
Dependent Claim
140 words
A multiple-stage type microwave amplifier comprising (2m+1) amplifier units each having substantially equal gain versus frequency characteristics, wherein m is any integer equal to or greater than 1; 2m lines each having an electrical length of o + theta 1'', theta o + theta 2'', . . . theta o + theta m'', theta o + pi - theta 1'', theta o + pi - theta 2'' . . . theta o + pi -theta m'' ( theta o being equal to or greater than zero) and theta 1'', theta 2'' . . . theta m'' satisfying the condition cos 2 theta 1'' + cos2 theta 2'' + . . . + cos2 theta m'' 0 at a frequency near the center of the amplifying band being inserted one by one between each of said (2m + 1) unit amplifiers.
Claim 4
Dependent Claim
140 words
A multiple-stage type microwave amplifier comprising (2m+1) amplifier units each having substantially equal gain versus frequency characteristics, wherein m is any integer equal to or greater than 1; 2m lines each having an electrical length of o + theta 1'', theta o + theta 2'', . . . theta o + theta m'', theta o + pi - theta 1'', theta o + pi - theta 2'' . . . theta o + pi -theta m'' ( theta o being equal to or greater than zero) and theta 1'', theta 2'' . . . theta m'' satisfying the condition cos 2 theta 1'' + cos2 theta 2'' + . . . + cos2 theta m'' 0 at a frequency near the center of the amplifying band being inserted one by one between each of said (2m + 1) unit amplifiers.
Claim 5
Dependent Claim
145 words
A multiple-stage type microwave amplifier comprising 1m amplifier units each having substantially equal gain versus frequency characteristics, wherein m is any integer equal to or greater than 1; (2m-1) lines each having electrical lengths of theta o, theta o + theta 2'', theta o + theta 3'', . . . theta o + theta m'', theta o + pi - theta 2'', theta o + pi - theta 3'' . . . . . theta o+ pi - theta m'' ( theta o being equal to or greater than zero) and theta 1'', theta 2'' . . . theta m'' satisfying the condition: cos2 theta 2'' + cos2 theta 3'' + . . . . . . .+ cos2 theta m'' - 1/2 at a frequency near the center of the amplifying band, being inserted one by one between each of the 2m unit amplifiers.
Claim 6
Dependent Claim
145 words
A multiple-stage type microwave amplifier comprising 1m amplifier units each having substantially equal gain versus frequency characteristics, wherein m is any integer equal to or greater than 1; (2m-1) lines each having electrical lengths of theta o, theta o + theta 2'', theta o + theta 3'', . . . theta o + theta m'', theta o + pi - theta 2'', theta o + pi - theta 3'' . . . . . theta o+ pi - theta m'' ( theta o being equal to or greater than zero) and theta 1'', theta 2'' . . . theta m'' satisfying the condition: cos2 theta 2'' + cos2 theta 3'' + . . . . . . .+ cos2 theta m'' - 1/2 at a frequency near the center of the amplifying band, being inserted one by one between each of the 2m unit amplifiers.
Claim 7
Dependent Claim
123 words
A multiple-stage type microwave amplifier comprising (n) amplifier units each having substantially equal gain versus frequency characteristics, wherein n is any integer equal to or greater than 5; (n-1) lines each having electrical lengths of theta 1, theta 2 . . . theta n 1 (said lines having electrical lengths equal to or greater than zero) said lengths satisfying the conditions: e j2 + e j2 + . . . + e j2 0 e j2 j2 + . . . +e j2 0 2 < or = k < or = -3 at a frequency near the center of the amplifying band, being inserted one by one between each of n unit amplifiers (n < or = 5) having substantially equal characteristics.
Claim 8
Dependent Claim
123 words
A multiple-stage type microwave amplifier comprising (n) amplifier units each having substantially equal gain versus frequency characteristics, wherein n is any integer equal to or greater than 5; (n-1) lines each having electrical lengths of theta 1, theta 2 . . . theta n 1 (said lines having electrical lengths equal to or greater than zero) said lengths satisfying the conditions: e j2 + e j2 + . . . + e j2 0 e j2 j2 + . . . +e j2 0 2 < or = k < or = -3 at a frequency near the center of the amplifying band, being inserted one by one between each of n unit amplifiers (n < or = 5) having substantially equal characteristics.
Claim 9
Dependent Claim
147 words
A multistage microwave amplifier having a substantially flat gain versus frequency response curve over a predetermined portion of the microwave frequency range comprising: n transistor amplifier stages each having substantially equal gain versus frequency operating characteristics where n < or = 3; n-1 strip lines each being connected between the output of an amplifier stage and the input of the next amplifier stage, wherein the order of said strip lines relative to the amplifier stages may be arbitrarily selected; each of said strip lines being of a different electrical length (l) wherein the electrical length l1, l2 . . . ln 1 of each strip line is l1 lo; l2 lo+ 1/(2(n-1)) lambda g ; l3 lo+ 2/(2(n-1)) lambda g; . . . ln 1 lo+ n-2/(2(n-1)) lambda g where lambda g the wavelength of the signal to be amplified and where lo < or = 0.
Claim 10
Dependent Claim
147 words
A multistage microwave amplifier having a substantially flat gain versus frequency response curve over a predetermined portion of the microwave frequency range comprising: n transistor amplifier stages each having substantially equal gain versus frequency operating characteristics where n < or = 3; n-1 strip lines each being connected between the output of an amplifier stage and the input of the next amplifier stage, wherein the order of said strip lines relative to the amplifier stages may be arbitrarily selected; each of said strip lines being of a different electrical length (l) wherein the electrical length l1, l2 . . . ln 1 of each strip line is l1 lo; l2 lo+ 1/(2(n-1)) lambda g ; l3 lo+ 2/(2(n-1)) lambda g; . . . ln 1 lo+ n-2/(2(n-1)) lambda g where lambda g the wavelength of the signal to be amplified and where lo < or = 0.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |