Circuit board and SMD antenna for this
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.
1. A printed circuit board including a surface mounted device antenna with 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;
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 paths of the conductor sections and spacings between 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. A telecommunications device with a printed circuit board as claimed in claim 1 .
5. A telecommunications device with an antenna as claimed in claim 1 .
6. A printed circuit board including a surface mounted device antenna with 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 paths of the conductor sections and spacings between the conductor sections are configured to excite a first harmonic of the first resonant frequency, wherein at least one of the first and second track structure has conductor sections of different widths.
7. A telecommunication device with a printed circuit board as claimed in claim 6 .
8. A telecommunication device with an antenna as claimed in claim 6 .
9. A printed circuit board comprising:
a surface mounted antenna; and
a ground metallization configured to substantially surround said antenna;
wherein said antenna comprises:
a first resonant structure having one end connected to said ground metallization, and another end connected to a supply lead configured to couple an electromagnetic wave to be emitted into the antenna; and
a second resonant structure having an end connected to the supply lead;
wherein a length of said first resonant structure is configured dimensionally to excite a desired first resonant frequency; and
wherein a length of said second resonant structure is configured dimensionally to excite at least one of a desired second resonant frequency and a harmonic of the second resonant frequency.
10. The printed circuit board of claim 9 , wherein the first resonant structure includes conductor sections, and paths of said conductor sections and spacings between said conductor sections are configured to excite a first harmonic of said first resonant frequency.
11. A telecommunications device with a printed circuit board as claimed in claim 9 .
12. A telecommunications device with an antenna as claimed in claim 9 .