1. A metal plate antenna, comprising:
a radiating portion, being a metal plate, two ends of the radiating portion being a first end and a second end respectively, the first end and the second end being bended towards the same direction and being perpendicular to the radiating portion, one of the first end and the second end being the feeding end, wherein at least one of the first end and the second end has at least a plug-foot, the plug-foot is used for plugging into the inserting hole of a circuit board; and
at least two grounding pins, vertical connected to the radiating portion, one of the grounding pins being used for connecting with the grounding of the circuit board.
2. The metal plate antenna according to claim 1, wherein the radiating portion is symmetry in the reference of the symmetry axis of the radiating portion, the two symmetrical ends are the first end and the second end respectively.
3. The metal plate antenna according to claim 1, wherein the at least two grounding pins comprising a first grounding pin and a second grounding pin, the first grounding pin and the second grounding pin are configured on two sides of the symmetry axis of the radiating portion respectively.
4. The metal plate antenna according to claim 1, wherein the plug-foot is L shaped or convex shaped.
5. The metal plate antenna according to claim 1, wherein the metal plate antenna is integrally molded.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
I claim:
1. Active hydraulic anti-vibration support designed to be interposed between two rigid elements and comprising:
first and second rigid armatures intended to be fixed respectively to the two rigid elements to be connected,
an elastomer body linking the two armatures to one another and partially bounding a working chamber filled with liquid,
a flexible wall partially bounding a compensating chamber filled with liquid, which is connected to the working chamber by a throttled passage also filled with liquid,
an exciter member having a first face communicating with the liquid contained in the working chamber and a second opposing face isolated from said working chamber, said exciter member being movably mounted in a direction of displacement substantially perpendicular to the first and second faces of the exciter member, starting from a non-operating position,
a control device designed to displace the exciter member at least in a first direction in said direction of displacement into an end stop position,
an elastic return device permanently applying a force to the exciter member to return it to its non-operating position, in accordance with a certain elasticity curve which imparts said return force depending on the displacement undergone by this exciter member parallel with the direction of displacement, this curve having a tangent for a first displacement value corresponding to the non-operating position of the exciter member, and the return force having a certain threshold value for a second displacement value corresponding to the end stop position of the exciter member,
wherein the elasticity curve of the return device is non linear and is located below said tangent at least in the vicinity of the second displacement value.
2. Anti-vibration support as claimed in claim 1, in which the elasticity curve of the return device has a maximum between the first and second displacement values.
3. Anti-vibration support as claimed in claim 1 or claim 2, in which the elasticity curve of the return device has a minimum substantially on a level with the second displacement value.
4. Anti-vibration support as claimed in claim 1, in which the elasticity curve of the return device has a linear initial part.
5. Anti-vibration support as claimed in claim 1, in which, in the non-operating position, the return device is an elastomer membrane which is of a substantially truncated cone shape converging towards the working chamber from an annular base joined to a rigid partition bounding said working chamber.
6. Anti-vibration support as claimed in claim 5, in which the exciter member has a rigid central wall which is joined to the rigid partition by the elastomer membrane.
7. Anti-vibration support as claimed in claim 5, in which the elastomer membrane has an annular zone of a reduced thickness in the vicinity of its annular base.
8. Anti-vibration support as claimed in claim 1, in which the control device is a pneumatic chamber which is in contact with the second face of the exciter member and which is designed to be linked selectively either to a vacuum source or to the atmosphere.
9. Active anti-vibration system comprising:
at least one active hydraulic anti-vibration support as claimed in claim 8,
and an actuating device which is designed to be linked to at least one device serving as a sensor to receive information representative of the engine speed of the vehicle, this actuating device being designed to:
cyclically link the pneumatic chamber alternately with a vacuum source and with the atmosphere in order to cause the exciter member to vibrate so as to generate counter-vibrations in the working chamber if the information received by the device serving as a sensor indicates that the vehicle engine is operating at an idling speed;
and link the pneumatic chamber permanently to the vacuum source if the information received by the device serving as a sensor indicates that the vehicle engine is operating at a speed higher than the idling speed so that the exciter member is then retained in its end stop position.
10. Anti-vibration system as claimed in claim 9, in which the actuating device is designed so that the pneumatic chamber applies to the exciter member a mean force corresponding to a linear initial part of the elasticity curve of the return device when the engine is idling.