JP2007520964A5 - - Google Patents

Claims (29)

A multiband antenna having a feed end connectable to an electrical circuit for signal transmission and / or reception, the antenna comprising:
A spiral first antenna element;
A second antenna element extending coaxially outside the first antenna element, wherein the first antenna element extends beyond at least one end of the second antenna element. Two antenna elements;
Extending parallel to the longitudinal axis of both the first and second antenna elements and outside the first antenna element in a region extending between the second antenna element and one end of the first antenna element. A third linear antenna element extending,
The interaction between the first, second and third antenna elements provides an operating frequency band that is added to the band when the first antenna element is used alone;
An antenna characterized by that.   The antenna according to claim 1, wherein end portions of the second and third antenna elements are connected to each other.   3. The antenna according to claim 1, wherein the third antenna element extends from the second antenna element in a direction away from the end of the second antenna element closest to the supply end of the antenna. And antenna.   3. The antenna according to claim 1, wherein the third antenna element extends from the second antenna element in a direction away from the end of the second antenna element farthest from the supply end of the antenna. And antenna.   5. The antenna according to claim 3, wherein the second antenna element is in the vicinity of a central portion in a longitudinal direction of the first antenna element.   The antenna according to any of the preceding claims, wherein the second and third antenna elements extend together over substantially the entire length of the first antenna element.   An antenna according to any preceding claim, wherein the first antenna element is located outside the first antenna element in order to maintain a state of being physically spaced from the second and third antenna elements. An antenna comprising an extending insulating means. The antenna of claim 1, further comprising:
A fourth linear antenna element that is parallel to the longitudinal axis of the third antenna element and extends from the third antenna element on the opposite side of the first antenna element;
The interaction between the first, second, third and fourth antenna elements provides an operating frequency band that is added to the band when the first antenna element is used alone;
An antenna characterized by that.   9. The antenna according to claim 8, wherein end portions of the second and third antenna elements are connected to each other.   10. The antenna according to claim 8, wherein the third antenna element extends from the second antenna element in a direction away from the end of the second antenna element closest to the supply end of the antenna. And antenna.   10. The antenna according to claim 8, wherein the third antenna element extends from the second antenna element in a direction away from the end of the second antenna element farthest from the supply end of the antenna. And antenna.   The antenna according to claim 10 or 11, wherein the second antenna element is in the vicinity of a central portion in a longitudinal direction of the first antenna element.   13. The antenna according to claim 10, wherein the second and third antenna elements extend together over substantially the entire length of the first antenna element.   14. The antenna according to any one of claims 10 to 13, wherein the first antenna element is maintained physically spaced from the second, third and fourth antenna elements. An antenna comprising insulating means extending to the outside of the first antenna element.   The antenna according to any one of the preceding claims, further comprising an elongated insulating support, wherein the first antenna element is wound around the insulating support.   16. The antenna according to claim 15, wherein the insulating support includes an insulating sheath extending so as to cover both the insulating support and the first antenna element wound around the insulating support. Antenna.   The antenna according to claim 15 or 16, wherein the elongated insulating support is a glass fiber rod.   The antenna according to any one of the preceding claims, wherein one or more of the antenna elements are formed of conductive wires.   19. The antenna according to claim 18, wherein the conducting wire of the one or more antenna elements has an insulating coating.   20. The antenna according to claim 19, wherein the insulating coating is enamel.   The antenna according to any one of claims 1 to 17, wherein the one or more antenna elements are formed of a metal tape.   The antenna according to any one of the preceding claims, wherein the antenna includes a flexible metal spring portion extending between a feeding end of the antenna and one end of the first antenna element. Antenna.   23. The antenna according to claim 22, wherein the metal spring portion is a spiral metal spring having a short-circuit wire extending in parallel to reduce the inductive loading action of the spring.   An antenna according to any of the preceding claims, comprising an outer insulating sheath.   25. The antenna according to claim 24, wherein an outer surface of the outer insulating sheath is configured to reduce wind noise of the antenna.   4. An antenna according to any preceding claim, wherein the first antenna element and one or more other antenna elements each have four resonant frequency bands each having a center frequency of a ratio of about 1: 2: 3: 4. An antenna characterized by being relatively positioned so that   The antenna according to any one of the preceding claims, wherein the antenna is a vehicle mast antenna.   28. The antenna of claim 27, comprising means for securing the mast antenna to the vehicle roof such that the antenna extends at an angle of about 60 degrees with respect to the horizontal. .   An antenna according to any preceding claim, wherein the physical space between the first antenna element and one or more other antenna elements is at least 0.02 mm.