Antenna for communication device

• US 5,554,996 A
• Filed: 09/08/1995
• Issued: 09/10/1996
• Est. Priority Date: 07/15/1994
• Status: Expired due to Term

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Chatzipetros, Argyrios
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US08/525,896
• Time in Patent Office: 368 Days
• Field of Search: 343/702, 343/833, 343/893, 343/901, 455/89, 455/277, 455/347, 455/351
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H04B 1/3838 Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
• CPC Class Codes: H04M 1/0202 Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03

Abstract

A diversity handset (100) used in a personal communication system includes a flap (104), a first antenna (108) and second antenna (110). The second antenna (110) consists of two portions, the first portion being a direct feed portion (202) printed onto a substrate (206), and the second portion consisting of a parasitic radiator (116) located within the flap (104). The first and second portions (202) and (116) of the second antenna (110) are inductively coupled together between the flap (104) and the substrate (206). Diversity is maintained with the flap (104) open or closed as well as with the flap removed from the handset (100).

Claims

1. A communication device, comprising:

a housing;

a substrate located within the housing;

an extendible antenna coupled to the housing;

a direct feed radiator disposed upon the substrate, the direct feed radiator and extendible antenna providing antenna diversity to said communication device; and

a flap;

the housing including a means for receiving the flap and coupling the flap to the housing, the flap including a parasitic radiator positioned to inductively couple to the direct feed radiator when the flap is coupled to the housing.

2. A communication device as described in claim 1, wherein the flap operates between a first position and a second position when coupled to the housing, the first position allowing the direct feed radiator to operate as an independent antenna while the second position allows the direct feed radiator inductively coupled to the parasitic radiator to operate as the independent antenna.

3. A communication device comprising:

a housing having a first end and a second end, the housing defining a cavity;

a transceiver circuit located within the cavity;

a flap rotatably coupled to the housing at the first end, the flap rotatable between a closed position adjacent the housing and an open position projecting from the housing;

an antenna including;

a direct feed portion located within the cavity proximate the first end of the housing and directly coupled to the transceiver circuit;

a resonant parasitic radiator portion positioned within the flap so as to be inductively coupled with the direct feed portion when the flap is in the open position; and

an extendible antenna coupled to the second end of the housing and configured to be extended from the second end of the housing, the extendible antenna being directly coupled to the transceiver circuit to provide antenna diversity for the communication device.

4. A communication device as described in claim 3 wherein the direct feed portion comprises a substantially quarter wavelength direct feed radiator and wherein the resonant parasitic radiator portion comprises a substantially half wavelength resonant parasitic radiator portion.

5. A communication device as described in claim 3 wherein the resonant parasitic radiator portion resonates at a predetermined frequency of interest in response to the direct feed portion.

6. A communication device as described in claim 3 wherein, when the flap is in the open position, one of the antenna and the extendible antenna selectively receive and transmit radio frequency signals, and when the flap is in the closed position, one of the direct feed portion and the extendible antenna selectively receive and transmit radio frequency signals.