Dielectric Waveguide Slot Antenna

• US 20120068900A1
• Filed: 09/19/2011
• Published: 03/22/2012
• Est. Priority Date: 09/17/2010
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: TOKO Incorporated (Murata Manufacturing Co Limited)
• Inventors: YATABE, Yukikazu, Ito, Kazuhiro
• Granted Patent: US 9,373,892 B2
• Time in Patent Office: Days
• US Class Current: 343/767
• CPC Class Codes: H01Q 13/10 Resonant slot antennas

Abstract

A dielectric waveguide slot antenna which is capable of radiating a circularly-polarized wave comprises: a dielectric waveguide having a slot through which a dielectric is exposed in a part of an electrically conductive film formed on a surface of the dielectric waveguide; a printed circuit board having a via hole opposed to the slot with the same shape as that of the slot; and a conductor plate having a first through-hole opposed to and having approximately the same shape as the via hole, and a pair of second through-holes in a vicinity of the first through-hole. The dielectric waveguide, the printed circuit board and the conductor plate are joined together with aligning the slot, the via hole and the first through-hole with each other. The printed circuit board has a conductor layer formed in positions facing to the second through-holes, and the second through-holes are arranged point-symmetrically with each other.

Claims

1. A dielectric waveguide slot antenna comprising:

a dielectric waveguide having a slot through which a dielectric is exposed in a part of an electrically conductive film formed on a surface of the dielectric waveguide;

a printed circuit board having a via hole formed therein at a position opposed to the slot, the via hole having approximately the same shape as that of the slot; and

a conductor plate having a first through-hole formed therein at a position opposed to the via hole, and a pair of second through-holes formed in a vicinity of the first through-hole, the first through-hole having approximately the same shape as that of the via hole, wherein;

the dielectric waveguide, the printed circuit board and the conductor plate are joined together with aligning the slot, the via hole and the first through-hole with each other;

the printed circuit board has a conductor layer formed in positions facing to the second through-holes; and

the second through-holes are arranged point-symmetrically with each other with respect to the center of the first through-hole, and rotated with respect to the longitudinal direction of the first through-hole.

2. The dielectric waveguide slot antenna as defined in claim 1, wherein a rotation angle of each of the second through-holes is about 45°

with respect to the longitudinal direction of the first through-hole.

3. The dielectric waveguide slot antenna as defined in claim 1, wherein the second through-holes have a longitudinal length of about 1.4 times as long as a longitudinal length of the first through-hole.

4. The dielectric waveguide slot antenna as defined in claim 1, wherein the second through-holes are disposed away from the center of the first through-hole by a distance less than a half of the wavelength of a frequency to be used.

5. The dielectric waveguide slot antenna as defined in claim 1, wherein the via hole has a longitudinal length larger than a longitudinal length of the slot, and the first through-hole has a longitudinal length larger than the longitudinal length of the via hole.

6. A dielectric waveguide slot antenna comprising:

a dielectric waveguide having a slot through which a dielectric is exposed in a part of an electrically conductive film formed on a surface of the dielectric waveguide;

a printed circuit board having a via hole formed therein at a position opposed to the slot, the via hole having approximately the same shape as that of the slot; and

a conductor plate having a through-hole formed therein at a position opposed to the via hole, and a pair of grooves in a vicinity of the through-hole, the through-hole having approximately the same shape as that of the via hole, wherein;

the dielectric waveguide, the printed circuit board and the conductor plate are joined together with aligning the slot, the via hole and the through-hole with each other; and

the grooves are arranged point-symmetrically with each other with respect to the center of the through-hole, and rotated with respect to a longitudinal direction of the through-hole.

7. The dielectric waveguide slot antenna as defined in claim 6, wherein a rotation angle of each of the grooves is about 45°

with respect to the longitudinal direction of the through-hole.

8. The dielectric waveguide slot antenna as defined in claim 6, wherein the grooves have a longitudinal length of about 1.4 times as long as a longitudinal length of the through-hole.

9. The dielectric waveguide slot antenna as defined in claim 6, wherein the grooves are disposed away from the center of the through-hole by a distance less than a half of the wavelength of a frequency to be used.

10. The dielectric waveguide slot antenna as defined in claim 6, wherein the via hole has a longitudinal length larger than a longitudinal length of the slot, and the through-hole has a longitudinal length larger than the longitudinal length of the via hole.