GB2414346A - Multi-frequency antenna with radiating and tuning elements printed on a circuit board - Google Patents
Multi-frequency antenna with radiating and tuning elements printed on a circuit board Download PDFInfo
- Publication number
- GB2414346A GB2414346A GB0506863A GB0506863A GB2414346A GB 2414346 A GB2414346 A GB 2414346A GB 0506863 A GB0506863 A GB 0506863A GB 0506863 A GB0506863 A GB 0506863A GB 2414346 A GB2414346 A GB 2414346A
- Authority
- GB
- United Kingdom
- Prior art keywords
- printed conductor
- frequency
- frequency antenna
- antenna
- adjusting line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 66
- 238000010586 diagram Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A multiple frequency antenna 20 comprises at least one conductor 12, 14, 16, 18 on one side of a printed circuit board 30 and at least one frequency tuning element 22, 24, 26 formed on the other side of the board. The patterns formed by the printed conductors are not limited and may include circles, rectangles and curved or straight lines or preferably continuous hairpin lines. The length of the tuning elements 22, 24, 26 may be one eighth to three eighths that of the resonating elements 16, 14, 18, respectively. The tuning elements 22, 24, 26 may be arranged adjacent to a central region of the resonating elements 12, 14, 16, 18. The antenna 20 may be tuned such that the resonance frequencies of the antenna are within a frequency band such as 210 MHz to 240 MHz. The antenna 20 may be used for transmitting and / or receiving digital signals in a number of different wavebands.
Description
24 1 4346
MULTI-FREQUENCY ANTENNA
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multi-frequency antenna and, more particularly, to a multi-frequency antenna with metal lines on a printed circuit board.
2. Description of the Related Art
With developments in digital wireless communications technologies, there exists not only conventional analog signal broadcasting utilizing Frequency Modulation (FM) and Amplitude Modulation (AM), but there is now also digital audio broadcasting (DAB) and digital audio radio (DAR).
Digital broadcasting has better noise resistance characteristics, is well suited for data transmission, and so should replace analog broadcasting in the future. The frequency band of digital broadcasting is between 210 MHz and 240 MHz (which the so-called third frequency upper band).
As shown in FIG. 1, a prior art multi-frequency antenna 10 is mounted on a printed circuit board 30 and composed of a first printed conductor 12, a second printed conductor 14, a third printed conductor 16 and a fourth printed conductor 18, which are all continuous, hairpin lines. The resonance frequency of the first printed conductor 12 is 245MHz, the resonance frequency of the second printed conductor 14 is 280MHz, the resonance frequency of the third printed conductor 16 is 245MHz, and the resonance frequency of the fourth printed conductor 18 is 260MHz. The resonance frequency is inversely proportional to the printed conductor. However, the prior art multi-frequency antenna 10 has the disadvantage that most of the resonance frequencies of the antenna 10 are not in the third frequency band, and so the receiver gain for digital broadcasting in the prior art multi-frequency antenna 10 is low.
Therefore, it is desirable to provide a multi-frequency antenna to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
A main objective of the present invention is to provide a multi-frequency antenna for receiving a digital broadcasting signal and outputting the digital broadcasting signal to an external communications circuit, the multi-frequency antenna comprises: at least one printed conductor placed on a front side of the multi-frequency antenna for receiving the digital broadcasting signal; and at least one frequency adjusting line placed on a rear side of the multi-frequency antenna and below the at least one printed conductor.
Furthermore, patterns of the at least one printed conductor and the at least one frequency adjusting line can be circles, rectangles, curved lines, straight lines or continuous hairpin lines.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic drawing of a prior art multi-frequency antenna; FIG. 2 is a schematic drawing of a multi-frequency antenna according to the present invention; FIG. 3 is a waveform diagram of current intensity; and FIG. 4 is a waveform diagram of return loss.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in FIG. 2, a multi-frequency antenna 20 of the present invention not only comprises the prior art multi-frequency antenna 10 including the first printed conductor 12, the second printed conductor 14, the third printed conductor 16 and the fourth printed conductor 18 on a front side of the printed circuit board 30, but also a first frequency adjusting line 22, a second frequency adjusting line 24, and a third frequency adjusting line 26 on a rear side of the printed circuit board 30.
The frequency adjusting lines are preferably positioned correspondingly to a center section of the printed conductors. As shown in FIG. 2, the second frequency adjusting line 24 is placed beneath the second printed conductor 14 and correspondingly to a center section of the second printed conductor 14; the third frequency adjusting line 26 is placed beneath the fourth printed conductor 18 and correspondingly to a center section of the fourth printed conductor 18. The resonance frequencies of the second printed conductor 14, the third printed conductor 16 and the fourth printed conductor 18 are coupled to each other and to the first printed conductor 12, and the first printed conductor 12 receives and outputs the digital broadcasting signal to an external communications circuit (not shown).
Therefore, the distances between the printed conductors and the first printed conductor 12 determine the coupling capabilities of the resonance frequency.
Since the physical distance between the third printed conductor 16 and the first frequency adjusting line 22 is the greatest, in order to increase the coupling capability of the resonance frequency of the first frequency adjusting line 22, the first frequency adjusting line 22 is placed beneath both the first printed conductor 12 and the third printed conductor 16 in a manner that corresponds to the central portions of the first printed conductor 12 and the third printed conductor 16. The patterns formed by the first printed conductor 12, the second printed conductor 14, the third printed conductor 16, the fourth printed conductor 18, the first frequency adjusting line 22, the second frequency adjusting line 24, and the third frequency adjusting line 26 are not limited; the patterns may include circles, rectangles, and curved or straight lines, with continuous hairpin lines being preferred. Furthermore, the lengths of the first frequency adjusting line 22, the second frequency adjusting line 24, and the third frequency adjusting line 26 are respectively preferred to be one-eighth to three-eighth the length of the third printed conductor 16, the second printed conductor 14, and the fourth printed conductor 18.
As shown in FIG. 3, graph line 32 depicts current generated by the resonance of the fourth printed conductor 18 when receiving a digital broadcasting signal without the third frequency adjusting line 26; graph line 34 depicts the current generated by the resonance of the fourth printed conductor 18 when receiving the digital broadcasting signal with the third frequency adjusting line 26 being placed beneath the fourth printed conductor 18. As shown in the drawing, the addition of the third frequency adjusting line 26 enhances the current generated by the resonance of the fourth printed conductor 18 to improve the receiving capabilities and noise resistance capabilities of the fourth printed conductor 18.
The return loss can be used to compare the receiving capabilities of the prior art multi-frequency antenna 10 with those of the multi-frequency antenna 20 of the present invention. As shown in FIG. 4, frequency is on the horizontal axis of the waveform diagram, and the return loss is on the vertical axis, waveform 42 is the resonance frequency of a prior art multi-frequency antenna 10, wherein the frequencies of the received signals of the first printed conductor 12, the second printed conductor 14, the third printed conductor 16, and the fourth printed conductor 18 are 215MHz, 228MHz,260MHz, and 273MHz, which are for the most part not in the third frequency band; waveform 44 shows the resonance frequency of the multi- frequency antenna 20, wherein the frequencies of the received signal of the first printed conductor 12, the second printed conductor 14, the third printed conductor 16, and the fourth printed conductor 18 are 210MHz, 219MHz, 230MHz, and 240MHz. Therefore, the first frequency adjusting line 22 biases the resonance frequency of the first printed conductor 12 from 215MHz to 21 OMHz, the resonance frequency of the third printed conductor 16 from 260MHz to 230MHz, and so on. Accordingly, the multi-frequency antenna 20 of the present invention is capable of supporting all resonance frequencies in the third frequency band, and so the multi- frequency antenna has better receiving capabilities within the required bandwidth than the
prior art multi-frequency antenna 10.
The prior art multi-frequency antenna 10 has higher resonance frequency gains, and so may have a smaller volume. The plurality of frequency adjusting lines can be added to the prior art multi-frequency antenna 10 to form the multi-frequency antenna 20 of the present invention, which is then capable of receiving digital broadcasting signals and improving return loss.
Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (9)
- WHAT IS CLAIMED IS: 1. A multi-frequency antenna for receiving a digitalbroadcasting signal and outputting the digital broadcasting signal to an external communication circuit, comprising: at least one printed conductor placed on a front side of the multi-frequency antenna for receiving the digital broadcasting signal; and at least one frequency adjusting line placed on a rear side of the multi-frequency antenna and below the at least one printed conductor.
- 2. The multi-frequency antenna as claimed in claim 1, wherein the pattern of the at least one printed conductor and the at least one frequency adjusting line are continuous hairpin lines.
- 3. The multi-frequency antenna as claimed in claim 1, wherein the pattern of the at least one printed conductor and the at least one frequency adjusting line are circles.
- 4. The multi-frequency antenna as claimed in claim 1, wherein the pattern of the at least one printed conductor and the at least one frequency adjusting line are rectangles.
- 5. The multi-frequency antenna as claimed in claim 1, wherein the pattern of the at least one printed conductor and the at least one frequency adjusting fine are straight lines.
- 6. The multi-frequency antenna as claimed in claim 1, wherein a length of the at least one frequency adjusting line is one-eighth to three-eighth length of the printed conductor.
- 7. The multi-frequency antenna as claimed in claim 1, wherein the at least one printed conductor is disposed at a position corresponding to a central portion of the at least one printed conductor.
- 8. The multi-frequency antenna as claimed in claim 1, wherein the digital broadcasting signal is transmitted in a third bandwidth.
- 9. A multi-frequency antenna substantially as described herein with reference to and as illustrated in figures 2 to 4 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW093114000A TWI238564B (en) | 2004-05-18 | 2004-05-18 | Multi-frequency printed antenna |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0506863D0 GB0506863D0 (en) | 2005-05-11 |
| GB2414346A true GB2414346A (en) | 2005-11-23 |
| GB2414346B GB2414346B (en) | 2008-03-12 |
Family
ID=34588651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0506863A Expired - Fee Related GB2414346B (en) | 2004-05-18 | 2005-04-05 | Bandwidth enhancement multi-resonator antenna |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2414346B (en) |
| TW (1) | TWI238564B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996038882A1 (en) * | 1995-06-02 | 1996-12-05 | Ericsson Inc. | Multiple band printed monopole antenna |
| WO2001013464A1 (en) * | 1999-08-18 | 2001-02-22 | Ericsson, Inc. | A dual band bowtie/meander antenna |
| US6198943B1 (en) * | 1999-05-17 | 2001-03-06 | Ericsson Inc. | Parasitic dual band matching of an internal looped dipole antenna |
| EP1396906A1 (en) * | 2002-08-30 | 2004-03-10 | Filtronic LK Oy | Tunable multiband planar antenna |
-
2004
- 2004-05-18 TW TW093114000A patent/TWI238564B/en not_active IP Right Cessation
-
2005
- 2005-04-05 GB GB0506863A patent/GB2414346B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996038882A1 (en) * | 1995-06-02 | 1996-12-05 | Ericsson Inc. | Multiple band printed monopole antenna |
| US6198943B1 (en) * | 1999-05-17 | 2001-03-06 | Ericsson Inc. | Parasitic dual band matching of an internal looped dipole antenna |
| WO2001013464A1 (en) * | 1999-08-18 | 2001-02-22 | Ericsson, Inc. | A dual band bowtie/meander antenna |
| EP1396906A1 (en) * | 2002-08-30 | 2004-03-10 | Filtronic LK Oy | Tunable multiband planar antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0506863D0 (en) | 2005-05-11 |
| TW200539506A (en) | 2005-12-01 |
| GB2414346B (en) | 2008-03-12 |
| TWI238564B (en) | 2005-08-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20090507 AND 20090513 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20140405 |