Microstrip arrangement

• US 6,266,016 B1
• Filed: 10/11/2000
• Issued: 07/24/2001
• Est. Priority Date: 11/21/1997
• Status: Expired due to Term

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Georgian, Spartak, Bergstedt, Leif
• Primary Examiner(s): Ho, Tan
• Application Number:
  US09/686,637
• Time in Patent Office: 286 Days
• Field of Search: 343/700.MS, 343/846, 343/848, 333/246, 333/238
• US Class Current: 343/700.0MS
• CPC Class Codes: H01P 3/084 Suspended microstriplines
• CPC Class Codes: H01Q 13/206 Microstrip transmission line antennas
• CPC Class Codes: H01Q 21/0081 using suspended striplines
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/045 with particular feeding means for circular polarisation H01Q9/0428
• CPC Class Codes: H05K 1/024 Dielectric details, e.g. changing the dielectric material around a transmission line
• CPC Class Codes: H05K 1/0245 Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
• CPC Class Codes: H05K 2201/09618 Via fence, i.e. one-dimensional array of vias
• CPC Class Codes: H05K 2201/09672 Superposed layout, i.e. in different planes parallel traces in one plane H05K2201/09236
• CPC Class Codes: H05K 2201/0979 Redundant conductors or connections, i.e. more than one current path between two points
• CPC Class Codes: H05K 2201/098 Special shape of the cross-section of conductors, e.g. very thick plated conductors
• CPC Class Codes: H05K 2201/09972 Partitioned, e.g. portions of a PCB dedicated to different functions; Boundary lines therefore; Portions of a PCB being processed separately or differently

Abstract

The invention relates to a microstrip arrangement comprising a first and a second microstrip conductor. The two microstrip conductors have essentially the same dimensions in their longitudinal direction and transverse direction, and are galvanically interconnected by means of at least one connection. The two microstrip conductors also extend essentially parallel to one another on either side of a dielectric material. As a result of this design of the microstrip arrangement, the field losses and also other influences caused by the dielectric material will be very considerably reduced, and in practice a resultant microstrip arrangement is obtained, which, with regard to its electrical performance, appears to be suspended in the air. Preferred embodiments comprise a microstrip antenna, a circuit board and a conductor application.

Claims

1. An antenna arrangement comprising:

a first ground plane;

a second ground plane separated from the first ground plane by at least a first and a second dielectric material, the second ground plane being substantially parallel to the first ground plane and having at least one opening;

a first microstrip conductor substantially parallel to the first and second ground planes and having substantially the same dimensions in the longitudinal and transverse directions as the at least one opening in the second ground plane;

a second microstrip conductor separated from the first microstrip conductor by at least a portion of the first dielectric material and galvanically coupled to the first microstrip conductor by at least one connector, the second microstrip conductor having substantially the same dimensions in the longitudinal and transverse directions as the first microstrip conductor and being substantially parallel to the first microstrip conductor; and

at least one radiating device, separated from the second ground plane by a third dielectric material;

wherein the first and second microstrip conductors and the at least one connector form a microstrip arrangement separated from each of the ground planes by the second dielectric material, the first and second microstrip conductors being substantially aligned with the at least one opening of the second ground plane in a direction perpendicular to the conductors, such that energy radiated from the microstrip arrangement is electro-magnetically coupled to the at least one radiating device.

2. The antenna arrangement according to claim 1, wherein at least one of the first and second microstrip conductors extends in the longitudinal and transverse directions into a cavity formed in the second dielectric material.

3. The antenna arrangement according to claim 1, wherein the at least one connector is comprised of a plurality of via holes.

4. The antenna arrangement according to claim 3, wherein the via holes are positioned substantially in the center of the microstrip conductors in relation to the longitudinal directions of the conductors and are spaced at a maximum distance of λ

/8 from one another, where λ

is a wavelength at which the microstrip arrangement is principally intended to operate.

5. The antenna arrangement according to claim 1, wherein the at least one connector is comprised of a continuous connection positioned substantially in the center of the microstrip conductors in relation to the longitudinal directions of the conductors.

6. The antenna arrangement according to claim 1, wherein the at least one connector is positioned to extend along at least a portion of the outer edges of the microstrip conductors.

7. The antenna arrangement according to claim 1, wherein the at least one radiating device is comprised of at least one patch element that is electro-magnetically coupled to the microstrip arrangement.

8. The antenna arrangement according to claim 1, wherein the outer edges of the microstrip conductors are beveled.

9. The antenna arrangement according to claim 1, wherein the first dielectric material and the second dielectric material comprise the same type of material to form a single dielectric layer having a first thickness between the first and second ground planes and a second thickness between the first and second microstrip conductors.