Double resonant wideband patch antenna and method of forming same

• US 6,034,637 A
• Filed: 12/23/1997
• Issued: 03/07/2000
• Est. Priority Date: 12/23/1997
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: McCoy, Danny O., Balzano, Quirino
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US08/996,899
• Time in Patent Office: 805 Days
• Field of Search: 343/700 MS, 343/846, 343/848, 343/847
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 5/342 for different propagation modes H01Q5/314 takes precedence
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

A double resonant wideband patch antenna (100) includes a planar resonator (101) forms a substantially trapezoidal shape having a non-parallel edge (103) for providing a substantially wide bandwidth. A feed line (107) extends parallel to the non-parallel edge (103) for coupling while a ground plane (111) extends beneath the planar resonator for increasing radiation efficiency.

Claims

1. A double resonant wideband patch antenna comprising:

a unitary planar resonator forming a trapezoidal shape;

a parasitically coupled substantially L-shaped feed line extending along at least one non-parallel edge of the planar resonator; and

a ground plane extending beneath the planar resonator for increasing radiation efficiency.

2. A double resonant wideband patch antenna as in claim 1 wherein the feedline is positioned in parallel with the one non-parallel edge.

3. A wideband patch antenna having at least two points of resonance over a predetermined frequency range comprising:

a unitary planar trapezoidal resonator having a single non-parallel edge;

a parasitically coupled substantially L-shaped feed line positioned below the planar trapezoidal resonator for feeding the single non-parallel edge with radio frequency (RF) energy; and

a ground plane positioned below the planar trapezoidal resonator and feed line for increasing radiation efficiency.

4. A wideband patch antenna as in claim 3 wherein the feed line is fed from one side and has a uniform width extending along the non-parallel edge of the planar trapezoidal resonator.

5. A method for providing a double resonant wideband patch antenna including the steps of:

positioning a unitary planar resonator having a trapezoidal shape with one non-uniform edge on a first substrate;

positioning a parasitically coupled substantially L-shaped feed line on a second substrate in proximity to the one-non uniform edge; and

positioning a ground plane on a second substrate beneath the feed line for increasing radiation efficiency of the double resonant wideband patch antenna.

6. A method of providing a double resonant wideband patch antenna as in claim 5 further including the steps of:

orienting the feed line such that it extends parallel to the non-uniform edge of the first substrate.

7. A method for providing a double resonator wideband patch antenna as in claim 5, wherein the feed line has a uniform width.