1. A multiband radio antenna device for a radio communication terminal, the multiband radio antenna device comprising:
a flat ground substrates;
a flat parasitic element in a plane parallel to said ground substrate, the flat parasitic element having a ground connection,
a flat antenna element having a feeding point and a ground connection, wherein said antenna element has a first longitudinal member, a first transverse member extending from a first end portion of said first longitudinal member, and a second transverse member extending from said first longitudinal member in the same direction as said first transverse member, wherein said parasitic element extends parallel to said second transverse member, wherein said second transverse member extends from a center portion of said first longitudinal member, wherein said parasitic element extends between said first and second transverse members, along and adjacent to an outer portion of said second transverse member from a center portion of the second transverse member, wherein said feeding point is disposed at said center portion of the second transverse member, wherein a first ground connection of the antenna element is disposed at an end portion, opposite said longitudinal member, of the second transverse member, and wherein a second ground connection of the antenna element is disposed at a center portion of said first transverse member.
2. The multiband radio antenna device as recited in claim 1, wherein said parasitic element has a first ground connection disposed adjacent to said feeding point.
3. The multiband radio antenna device as recited in claim 1, wherein said antenna element has a second longitudinal member extending from said end portion of said second transverse member, away from said first transverse member.
4. The multiband radio antenna device as recited in claim 3, wherein said antenna element has a third transverse member extending from an end portion of said second longitudinal member opposite said second transverse member, towards said first longitudinal member.
5. The multiband radio antenna device as recited in claim 4, wherein said antenna element has a fourth transverse member extending from said first longitudinal member between said second and said third transverse members.
6. The multiband radio antenna device as recited in claim 1, wherein said feeding point is disposed on a protruding member at said center portion of the second transverse member, protruding towards first transverse member.
7. The multiband radio antenna device as recited in claim 6, wherein said protruding member is tapered towards said first transverse member.
8. The multiband radio antenna device as recited in claim 7, wherein said parasitic element has a leg member extending parallel to a side of the tapered protruding member facing away from said first longitudinal member.
9. The multiband radio antenna device as recited in claim 1 a an outer portion, extending from said center portion, of said first transverse member has a side edge facing said second transverse member, which side edge extends at an angle towards said second transverse member, such that said first transverse member widens towards its outer end.
10. The multiband radio antenna device as recited in claim 1 wherein said ground plane has a longitudinal length of one third of a selected base band.
11. A radio communication terminal comprising:
a radio transmitter; and
a multiband radio antenna device coupled to the radio transmitter, the multiband radio antenna device comprising,
a flat ground substrate,
a flat parasitic element in a plane parallel to said ground substrate, the flat parasitic element having a ground connection, and
a flat antenna element having a feeding point and a ground connection, wherein said antenna element has a first longitudinal member, a first transverse member extending from a first end portion of said first longitudinal member, and a second transverse member extending from said first longitudinal member in the same direction as said first transverse member, wherein said parasitic element extends parallel to said second transverse member, wherein said second transverse member extends from a center portion of said first longitudinal member, wherein said parasitic element extends between said first and second transverse members, along and adjacent to an outer portion of said second transverse member from a center portion of the second transverse member, wherein said feeding point is disposed at said center portion of the second transverse member, wherein a first ground connection of the antenna element is disposed at an end portion, opposite said longitudinal member, of the second transverse member, and wherein a second ground connection of the antenna element is disposed at a center portion of said first transverse member.
12. The radio communications terminal as recited in claim 11, wherein said parasitic element has a first ground connection disposed adjacent to said feeding point.
13. The radio communications terminal as recited in claim 11, wherein said antenna element has a second longitudinal member extending from said end portion of said second transverse member, away from said first transverse member.
14. The multiband radio antenna device as recited in claim 13, wherein said antenna element has a third transverse member extending from an end portion of said second longitudinal member opposite said second transverse member, towards said first longitudinal member.
15. The multiband radio antenna device as recited in claim 14, wherein said antenna element has a fourth transverse member extending from said first longitudinal member between said second and said third transverse members.
16. The multiband radio antenna device as recited in claim 11, wherein said feeding point is disposed on a protruding member at said center portion of the second transverse member, protruding towards first transverse member.
17. The multiband radio antenna device as recited in claim 16, wherein said protruding member is tapered towards said first transverse member.
18. The multiband radio antenna device as recited in claim 17, wherein said parasitic element has a leg member extending parallel to a side of the tapered protruding member facing away from said first longitudinal member.
19. The multiband radio antenna device as recited in claim 11 an outer portion, extending from said center portion, of said first transverse member has a side edge facing said second transverse member, which side edge extends at an angle towards said second transverse member, such that said first transverse member widens towards its outer end.
20. The multiband radio antenna device as recited in claim 11 wherein said ground plane has a longitudinal length of one third of a selected base band.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical apparatus, comprising:
an integrated module that accommodates a laser diode and a photo diode and terminates an optical fiber;
a circuit board electrically connected to a lead pin leading out of the integrated module; and
a case that accommodates the circuit board therein and that is formed of a material that includes a plastic substance;
wherein at least a part of the case abuts the integrated module;
impedance of the case is controlled by mixing a conductive filler into the case material; and
content of the conductive filler in the case material being approximately 20% to 30%.
2. An optical apparatus according to claim 1, wherein the integrated module includes a metal housing.
3. An optical apparatus according to claim 2, further comprising a conductive spring member which is mounted such that a leg portion thereof is engaged with a bottom portion of the case and that a flat plate portion which is continuously provided to the leg portion biases the metal housing toward the bottom portion of the case while the flat plate portion is brought into contact to a front surface of the metal housing.
4. An optical apparatus according to claim 3, wherein the flat plate portion is bent toward the front surface of the metal housing in a valley manner and has a spring property.
5. An optical apparatus according to claim 3, wherein the spring member is provided with a lead plate and connected to a ground terminal or a power supply terminal of the circuit board through the lead plate.
6. An optical apparatus according to claim 5, wherein the lead plate is connected to the ground terminal or the power supply terminal of the circuit board depending on a surface mount device shape.
7. An optical apparatus according to claim 5, wherein the lead plate is connected to the ground terminal or the power supply terminal of the circuit board depending on an insertion mount device shape.
8. An optical apparatus according to claim 1, wherein the optical fiber is led out of an end of the integrated module;
the case includes a bottom portion and a side wall portion;
a part of the side wall portion corresponding to a led out portion of the optical fiber is formed to be an opening; and
a sleeve protruding from an edge of the opening in a lead-out direction is provided to the case.
9. An optical apparatus, comprising:
an integrated module being coated with a plastic material whose impedance is controlled by mixing a conductive filler, which accommodates a laser diode and a photo diode and terminates an optical fiber;
a circuit board electrically connected to a lead pin that is led out of the integrated module;
a case that accommodates the circuit board and that is formed of a material that includes a plastic substance; and
content of the conductive filler in the case material being approximately 20% to 30%.
10. An optical apparatus, comprising:
an integrated module being coated with a synthetic resin material whose impedance is controlled by mixing a conductive filler, which accommodates a light emitting device and a light receiving device and terminates a single-core bidirectional optical fiber;
a circuit board electrically connected to a conductive terminal that is led out of the integrated module;
a case that accommodates the circuit board and that is formed of a material that includes a synthetic resin; and
content of the conductive filler in the case material being approximately 20% to 30%.
11. An optical apparatus, comprising:
an integrated module that accommodates a light emitting device and a light receiving device and terminates a single-core bidirectional optical fiber;
a circuit board electrically connected to a conductive terminal that is led out of the integrated module; and
a case that accommodates the circuit board and that is formed of a material that includes a synthetic resin;
wherein at least a part of the case is brought into contact with the integrated module;
impedance of the case is controlled by mixing a conductive filler into the material that includes the synthetic resin; and
content of the conductive filler in the material that includes the synthetic resin being approximately 20% to 30%.
12. An optical apparatus according to claim 1, wherein the impedance is controlled owing to a structure in which a resistant component is connected in parallel with an inductance component of an electrical crosstalk path formed between a light emitting side and a light receiving side of the integrated module.