US3589794A — Optical circuits

Claim 1

Independent Claim 89 words

A reactive termination for a waveguide comprising: a pair of transmission lines extending coextensively over a coupling interval to form a 3 db. directional coupler having two pairs of conjugate ports; one branch of one pair of conjugate branches being both the input and output branch of said termination; a source of incident wave energy coupled to said one branch; the other branch of said one pair of conjugate branches being resistively terminated; and a third transmission line connecting the branches of said second pair of conjugate branches together.

Claim 2

Dependent Claim 89 words

A reactive termination for a waveguide comprising: a pair of transmission lines extending coextensively over a coupling interval to form a 3 db. directional coupler having two pairs of conjugate ports; one branch of one pair of conjugate branches being both the input and output branch of said termination; a source of incident wave energy coupled to said one branch; the other branch of said one pair of conjugate branches being resistively terminated; and a third transmission line connecting the branches of said second pair of conjugate branches together.

Claim 3

Dependent Claim 27 words

The termination according to claim 1 wherein said transmission lines comprise a low-loss dielectric substrate and an elongated, low-loss guiding strip of higher refractive index embedded therein.

Claim 4

Dependent Claim 87 words

A band-rejection filter for electromagnetic wave energy comprising: a length of transmission line; and at least one resonant cavity tuned to the band of frequencies to be rejected; first and second directional coupling means for coupling wave energy between said line and said cavity at two different locations along said cavity; characterized in that said cavity is a closed loop, supportive of traveling waves; and in that wave energy coupled from said line into said cavity at said two locations induce therein two equal, oppositely propagating waves.

Claim 5

Dependent Claim 87 words

A band-rejection filter for electromagnetic wave energy comprising: a length of transmission line; and at least one resonant cavity tuned to the band of frequencies to be rejected; first and second directional coupling means for coupling wave energy between said line and said cavity at two different locations along said cavity; characterized in that said cavity is a closed loop, supportive of traveling waves; and in that wave energy coupled from said line into said cavity at said two locations induce therein two equal, oppositely propagating waves.

Claim 6

Dependent Claim 31 words

The filter according to claim 40 including a plurality of resonant cavities longitudinally distributed along said line, and wherein said line is directionally coupled to each cavity at two different locations.

Claim 7

Dependent Claim 15 words

The filter according to claim 4 wherein said cavities are tuned to the same frequencies.

Claim 8

Dependent Claim 11 words

The filter according to claim 4 wherein said cavities are stagger-tuned.

Claim 9

Dependent Claim 26 words

The filter according to claim 3 wherein said cavity is a figure-eight, and wherein said transmission line is directionally coupled to each loop of said figure-eight.

Claim 10

Dependent Claim 26 words

The filter according to claim 7 wherein the crossed portions of said cavity at the crossover region of said figure-eight are electrically isolated from each other.

Claim 11

Dependent Claim 17 words

The filter according to claim 7 wherein the crossed portions of said cavity intersect at right angles.

Claim 12

Dependent Claim 41 words

The filter according to claim 3 wherein said cavity is a ring, and said transmission line includes a loop; and wherein one coupling location is along said transmission line outside said loop, and the second coupling location is along said loop.

Claim 13

Dependent Claim 41 words

The filter according to claim 3 wherein said cavity is a closed loop; wherein said transmission line intersects said cavity at right angles at two positions; and wherein said transmission line is directionally coupled to opposite sides of said intersected loop.

Claim 14

Dependent Claim 40 words

The filter according to claim 3 where said cavity is a closed loop; wherein said transmission line extends across said cavity; and wherein said transmission line is directionally coupled to the portions of said cavity lying on opposite sides thereof.

Claim 15

Dependent Claim 30 words

The filter according to claim 3 wherein said cavity is a closed loop; and wherein said transmission line intersects said cavity at two locations at an angle less than 90*.

Claim 16

Dependent Claim 28 words

The filter according to claim 5 wherein said transmission lines comprise: a low-loss dielectric substrate and an elongated, low-loss dielectric guiding strip of higher refractive index embedded therein.

Claim 17

Dependent Claim 54 words

A band-rejection filter for electromagnetic wave energy comprising: a section of transmission line; a resonant cavity tuned to the band of frequencies to be rejected; characterized in that said cavity is a right-angle figure-eight; and in that said transmission line intersects said cavity at the crossover region of said figure-eight at a 45* angle.

Claim 18

Dependent Claim 54 words

A band-rejection filter for electromagnetic wave energy comprising: a section of transmission line; a resonant cavity tuned to the band of frequencies to be rejected; characterized in that said cavity is a right-angle figure-eight; and in that said transmission line intersects said cavity at the crossover region of said figure-eight at a 45* angle.

Claim 19

Dependent Claim 59 words

A band-pass filter for electromagnetic wave energy comprising: first and second transmission lines having closed loop terminations; and at least one resonant cavity tuned to the band of frequencies to be passed; characterized in that said cavity is a closed loop, traveling wave structure; and in that wave energy is directionally coupled between said cavity and said loop terminations.

Claim 20

Dependent Claim 59 words

A band-pass filter for electromagnetic wave energy comprising: first and second transmission lines having closed loop terminations; and at least one resonant cavity tuned to the band of frequencies to be passed; characterized in that said cavity is a closed loop, traveling wave structure; and in that wave energy is directionally coupled between said cavity and said loop terminations.

Claim 21

Dependent Claim 33 words

The filter according to claim 16 wherein each of said transmission lines and said cavity comprise: a low-loss dielectric substrate and an elongated, low-loss dielectric guiding strip of higher refractive index embedded therein.

Claim 22

Dependent Claim 27 words

The filter according to claim 16 including a plurality of resonant cavities cascaded between said lines wherein each cavity is directionally coupled to the next adjacent cavity.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-06-28	1974-12-28	1975-06-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-06-28	1978-12-28	1979-06-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-06-28	1982-12-28	1983-06-29	$7700.00	Window Closed / Lapsed

Optical circuits

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