Circuit board and SMD antenna

• US 6,683,576 B2
• Filed: 09/04/2002
• Issued: 01/27/2004
• Est. Priority Date: 09/04/2001
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Achim, Hilgers
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US10/234,799
• Publication Number:
  US 20030043081A1
• Time in Patent Office: 510 Days
• Field of Search: 343/702, 343/700.MS
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A printed circuit board (4) is described for surface mounting of electrical and/or electronic components, in particular an SMD (surface mounted device) antenna with a ceramic substrate (1) and at least one resonant track structure (20; 30), and such an antenna for single and multiband applications, in particular in the high-frequency and microwave range. Since one end of the track structure (20) of the antenna is connected to the ground metallization (41), a relatively large bandwidth is achieved with small dimensions of the antenna plus the possibility of smaller board design.

Claims

1. A printed circuit board for surface mounting of electrical components including a surface mounted device antenna with a ceramic substrate and at least one resonant conductor track structure, the printed circuit board comprising a ground metallization configured to substantially surround the antenna, and to connect to one end of the conductor track structure, the antenna comprising a first supply lead configured to connect one end of a first resonant track structure of the antenna to a ground potential and a second supply lead configured to couple an electromagnetic wave to be emitted into the antenna, which first track structure has a plurality of conductor sections, while the length of the conductor track structure is dimensioned so as to excite a desired first resonant frequency, and the paths and spacings of the conductor sections are configured to excite a first harmonic of the first resonant frequency, and a second resonant track structure, one end of which is connected to the second supply lead and the length of which is configured dimensionally to excite at least one of a desired second resonant frequency and a harmonic of the second resonant frequency.

2. An antenna as claimed in claim 1, wherein the spacing between the first and second track structures is configured such that the resonant frequencies of the antenna are excited by a combined capacitive and resonant coupling of the electromagnetic wave to be emitted.

3. An antenna as claimed in claim 1, wherein the first track structure has conductor sections of different widths.

4. An antenna as claimed in claim 1, wherein at least one of the first and second track structure has conductor sections of different widths.

5. A telecommunications device with a printed circuit board as claimed in claim 1.

6. A telecommunications device with an antenna as claimed in claim 1.

7. A telecommunications device with an antenna as claimed in claim 1, wherein the antenna is a printed wire antenna.