Dual-polarized radiation element and planar oscillator thereof

1. A planar oscillator for a dual polarized radiation element of an array of antenna, comprising:

An oscillator portion formed by four oscillator arms, the four oscillator arms defining two orthogonal half-wave oscillators, each oscillator arm being of a square and these oscillator arms being arranged in a square configuration, each oscillator arm having a feeding terminal defined at a corner thereof facing another oscillator arm;

A connective portion connected among these oscillator arms so that these arms are connected with each other; and

A medium base plate on which the oscillator portion and connective portion are printed and a plurality of through holes is defined.

2. The planar oscillator according to claim 1 , wherein the connective portion is of a square shape and is disposed at the periphery of the oscillator portion and connected with four corners of the periphery of the oscillator portion.

3. The planar oscillator according to claim 1 , wherein the connective portion includes four extension frames each of which has a rectangular frame and two extension arms extended from two ends of a breaking location of a longitudinal side of the rectangular frame; the two extension arms of each extension arm are connected with two adjacent sides of two adjacent oscillator arms respectively.

4. The planar oscillator according to claim 3 , wherein an opening is defined between two adjacent corners of two adjacent extension frames.

5. The planar oscillator according to claim 1 , wherein the oscillator portion is formed integrally with the connective portion.

6. A dual polarized radiation element for forming an array of antennae, comprising:

A planar oscillator according to claim 1 ; and

A balanced feeding connector the bottom portion of which is secured onto a metal reflection plate of the array of antennae, while the top portion thereof is fixed to the planar oscillator for supporting a connective element for feeding power to the planar oscillator.

7. The dual polarized radiation element according to claim 6 , wherein the balanced feeding connector comprises two identical medium plates; each medium plate has a notch defined at its middle portion longitudinally such that the two medium plates are connected with each other in a crossed manner; two bumps are formed on the top portion of each medium plate; each medium plate has a micro-strip line formed at one side thereof and extended from the bumps to the bottom of the medium plate, said micro-strip line passing through the through holes defined in the medium base plate of the planar oscillator for connecting with the feeding terminal so as to be grounded; each medium plate also has another micro-strip line formed at the other side thereof for coupling the signals to one of the two half-wave oscillator; and these micro-strip lines constitute the connective element.

8. The dual polarized radiation element according to claim 6 , wherein the balanced feeding connector is of a cylinder shape; a cross groove is defined at the central portion of the balanced feeding connector for dividing the connector into four sectored posts; an embossment is formed on the top portion of each sectored post; a receiving hole is defined in the post and extended from the embossment downwardly to the bottom portion of the post for receiving the connective element; the connective element is of a coaxial cable and has an external conductor and internal conductor; the external conductor is connected with the inner wall of the sectored post, while the internal conductor thereof reaches the respective embossment and passes through the through hole of the medium plate of the planar oscillator so as to be connected to the feeding terminal provided on the other oscillator arm.