Planar dual frequency band antenna

• US 5,926,139 A
• Filed: 07/02/1997
• Issued: 07/20/1999
• Est. Priority Date: 07/02/1997
• Status: Expired due to Term

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Korisch, Ilya A.
• Primary Examiner(s): Le, Hoanganh
• Assistant Examiner(s): VANNUCCI, JAMES
• Application Number:
  US08/887,021
• Time in Patent Office: 748 Days
• Field of Search: 343/700 MS, 343/702, 343/718, 343/725, 343/843
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• 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 5/371 Branching current paths
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

A single planar antenna for use in two frequency bands includes radiating portions for the two bands joined by a connecting portion and spaced from a ground plane. Each radiating portion is formed as a planar inverted F-antenna. A grounding pin interconnects the connecting portion and the ground plane and a single feed pin connects the connecting portion to the input/output port of transceiver circuitry.

Claims

1. A planar dual frequency band antenna for use in a radio transceiver device comprising:

a planar dielectric substrate having first and second major surfaces;

a first layer of conductive material on the first major surface of said substrate to function as a ground plane for the antenna;

a unitary second layer of conductive material on the second major surface of said substrate to function as a radiating element for the antenna, the second layer having a first radiating portion shaped and sized to function as a first planar inverted F-antenna for a first of the frequency bands, a second radiating portion shaped and sized to function as a second planar inverted F-antenna for the second of the frequency bands, and a connecting portion joining said first and second radiating portions of said second layer;

a grounding pin extending through said substrate and interconnecting said first layer and the connecting portion of said second layer; and

a feed pin connected to said connecting portion of said second layer and coupled to circuitry of said radio transceiver device.

2. The antenna according to claim 1 wherein said second layer has an overall configuration shaped generally like the letter J.

3. The antenna according to claim 2 wherein at least one of said first and second radiating portions of said second layer meanders.

4. The antenna according to claim 1 wherein each of said radiating portions extends from said feed pin approximately one-quarter of the wavelength at the center frequency of the respective frequency band.

5. The antenna according to claim 1 wherein said feed pin extends through said first layer and said substrate and is insulated from said first layer.