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Multi-band PIFA

A multi-band antenna and frequency band technology, applied to electrical components, devices that enable antennas to work in different bands at the same time, electrical short antennas, etc., can solve problems affecting antenna performance, etc.

Inactive Publication Date: 2008-09-24
SONY ERICSSON MOBILE COMM AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while parasitic elements can improve antenna performance in one of the wireless communication bands, parasitic elements often adversely affect the performance of antennas in other wireless communication bands

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0012] figure 1 A block diagram of an exemplary wireless communication device 10 is illustrated. The wireless communication device 10 includes a controller 20 , a memory 30 , a user interface 40 , a transceiver 50 and a multi-band antenna 100 . The controller 20 controls the operation of the wireless communication device 10 in response to programs stored in the memory 30 and instructions provided by a user via the user interface 40 . Transceiver 50 interfaces wireless communication device 10 with a wireless network using antenna 100 . It is understood that transceiver 50 may operate in accordance with one or more of any known wireless communication standards, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Global System for Mobile Communications (GSM), Global Positioning System (GPS), Personal Digital Cellular (PDC), Advanced Mobile Phone System (AMPS), Personal Communications Device (PCS), Wideband CDMA (WCDMA), etc.

[0013] The multiba...

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Abstract

The method and apparatus described herein improves the impedance matching of a multi-band antenna (100). In particular, the multi-band antenna (100) comprises a radiating element (110) vertically displaced from an antenna ground plane (132) by feed and ground elements (116, 118), and a parasitic element (120) interposed between the feed and ground elements (116, 118). When the multi-band antenna (100) operates in the first frequency band, a selection circuit (140) connects the parasitic element (120) to the ground plane (132) to capacitively couple the ground element (118) to the feed element (116). However, when the multi-band antenna (100) operates in the second frequency band, the selection circuit (140) disables the capacitive coupling. By applying the capacitive coupling only when the multi-band antenna (100) operates in the first frequency band, the present invention improves the performance of the antenna (100) in the first frequency band without adversely affecting the performance of the antenna (100) in the second frequency band.

Description

technical field [0001] The present invention relates generally to wireless communication antennas and, more particularly, to multi-band antennas for wireless communication devices. Background technique [0002] Wireless communication devices typically use multi-band antennas to transmit and receive data such as Advanced Mobile Phone System (AMPS), Personal Communications Services (PCS), Personal Digital Cellular (PDC), Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA) Wireless signals in multiple wireless communication frequency bands. Due to its small size and multi-band capability, the planar inverted-F antenna (PIFA) represents a general-purpose multi-band antenna for wireless communication devices. A PIFA typically includes a radiating element separate from the antenna ground plane. Since the spacing between the radiating elements and the ground plane affects the impedance matching associated with multiband antennas, PIFAs typically in...

Claims

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Application Information

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IPC IPC(8): H01Q9/04H01Q5/00H01Q5/10H01Q5/371
CPCH01Q5/00H01Q9/045H01Q5/371H01Q5/0058H01Q9/0442
Inventor M·奥兹卡
Owner SONY ERICSSON MOBILE COMM AB
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