WO2000049675A1 - Dämpfungsarme filter/schalteranordnung - Google Patents
Dämpfungsarme filter/schalteranordnung Download PDFInfo
- Publication number
- WO2000049675A1 WO2000049675A1 PCT/DE1999/002255 DE9902255W WO0049675A1 WO 2000049675 A1 WO2000049675 A1 WO 2000049675A1 DE 9902255 W DE9902255 W DE 9902255W WO 0049675 A1 WO0049675 A1 WO 0049675A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- line
- transmitter
- low
- circuit arrangement
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
Definitions
- the invention relates to a circuit arrangement for switching over the transmission characteristic of an HF line or filter and a switchable transmitter / receiver for transmitting / receiving HF signals with a first frequency fl and a second frequency f2 in the range of a higher harmonic of f1.
- harmonic suppression When generating high-frequency signals of a certain fundamental frequency fl, additional harmonic signals, in particular the frequency 2fl, are always generated due to the non-linearities of the components used. Effective suppression of these parasitic higher harmonics is desirable for many applications. If the harmonic suppression is realized with conventional filter technology such as low-pass filters or the like, problems arise, however, when an RF line or circuit arrangement is to be designed for two different frequencies, the higher frequency in each case being in the region of a higher harmonic of the lower frequency. An example of this are so-called dual-mode cell phones, which are both in the GSM frequency band in the 900 MHz and in the
- PCN frequency band in the range of 1710-1785 MHz should be operable.
- the invention is therefore based on the object of a switch arrangement for switching the transmission characteristic of an RF line or a filter between a first state for transmitting a first frequency fl and a second state for transmitting a second frequency f2 in the higher harmonic range of fl to propose, in which the higher harmonic of fl is suppressed in the first state and which has the lowest possible signal attenuation for both frequencies.
- the object is achieved by a switch arrangement with a ⁇ / 4-line element connected to the HF line, which can be connected in a switchable manner with a low-resistance termination.
- the ⁇ / 4 line element represents a ⁇ / 2 line element for the double frequency 2fl, which in the short-circuited state brings about effective damping of the harmonic wave, while the fundamental frequency is not damped. If, however, the connection of the ⁇ / 4 line element to the low-resistance termination, preferably ground, is interrupted, the higher frequency f2 in the region of 2fl is not attenuated. A conventional low-pass filter with a correspondingly high cutoff frequency can then be selected to suppress the harmonics of f2.
- the switch arrangement according to the invention can thus be used to switch between a frequency fl and a frequency f2 close to 2fl, with very low attenuation being possible for both frequencies, so that line paths and amplifier outputs can be used jointly for both frequencies.
- this can save costs, space and weight.
- the invention also proposes a switchable transmitter / receiver for transmitting / receiving RF signals with a first frequency fl and a second frequency f2 in the range of a higher harmonic of fl with a first RF unit for generating transmission signals of the frequencies fl and f2, a receiving unit for receiving signals of frequencies fl and f2, a signal output connected via a branch to the RF unit and the receiving unit, a ⁇ / 4 line element connected between the RF unit and the signal input / output, which by means of a first Switching element can be connected with a low-resistance termination, a line element arrangement arranged between the branching and the RF unit with two series-connected ⁇ / 8-
- Line elements whose connection point connects to a low-resistance connection by means of a second switching element. bar and a third switching element for switching between transmitting and receiving operation.
- the ⁇ ⁇ / 4 line element enables switching between low-attenuation transmission of frequency fl with simultaneous suppression of harmonic wave 2fl and low-attenuation transmission of frequency f2.
- the line element arrangement with two ⁇ / 8 line elements connected in series enables a high impedance of the respective operating frequency fl or f2 in reception mode at the junction in the direction of the transmission branch.
- the ⁇ / 4 line element can preferably be connected to ground by means of a switchable diode, for example a PIN diode.
- a low-pass filter with a suitable cutoff frequency can be provided to dampen higher harmonics of the higher frequency f2.
- ⁇ / 4 and ⁇ / 8 line elements can preferably be designed as strip lines, microstrip lines or coaxial cables.
- a suitable dielectric is, for example, printed circuit board material which does not incur any additional costs or a ceramic substrate which, owing to its higher dielectric constant, permits smaller dimensions of the line elements.
- Figure 1 is a block diagram of an embodiment of a switch arrangement according to the invention
- Figure 2 is a block diagram of an embodiment of a transmitter / receiver according to the invention
- FIG. 3 shows a computer simulation of the frequency response of a transmitter / receiver according to the invention in transmission mode with the frequency fl;
- FIG. 4 shows a computer simulation of the frequency response of a transmitter / receiver according to the invention in transmission mode at frequency f2;
- FIG. 5 shows a computer simulation of the frequency response of a transmitter / receiver according to the invention in reception mode at frequency f1;
- FIG. 6 shows a computer simulation of the frequency response of a transmitter / receiver according to the invention in reception mode at frequency f2;
- Figure 7 is a block diagram of another embodiment of a circuit arrangement according to the invention.
- FIG. 1 shows schematically a block diagram of an exemplary embodiment of a switch arrangement according to the invention for switching the transmission characteristic of an HF line 2.
- a signal input 3 and a signal output 4 are shown schematically.
- a ⁇ / 4 line element is arranged at a junction between input 3 and output 4 and is connected to ground via a switchable PIN diode 6.
- the ⁇ / 4 line element can be designed as a strip line, microstrip line or coaxial conductor, with conventional printed circuit board material, for example glass fiber reinforced plastic or a ceramic material, being suitable as the dielectric.
- a low-pass filter 8, 9 is additionally arranged, the cut-off frequency of which is selected such that the lower frequency fl and the higher one Frequency f2 are both transmitted with low attenuation, but harmonics 2f2 are damped.
- the switchable PIN diode 6 can be used to switch the switch arrangement between the two states - low-loss transmission of fl and suppression of 2fl when the diode 6 is closed and low-loss transmission of f2 when the diode 6 is open. If the diode 6 is switched to forward operation, ie the ⁇ / 4 line element 5 is short-circuited to ground, then the ⁇ / 4 circuit element 5 acts with respect to signals of the fundamental frequency fl as a ⁇ / 4-line transformer short-circuited to ground, so that the short-circuiting effect occurs through the HF line 2 is transformed into signals of the frequency f 1 being idle and these signals can be conducted with very little attenuation.
- the ⁇ / 4 line element represents a ⁇ 2/2 line element, so that no impedance transformation takes place.
- two or more ⁇ / 4 line elements can be connected in series.
- FIG. 2 shows schematically in a block diagram an exemplary embodiment of a switchable transmitter / receiver 10 according to the invention.
- An HF connection 22 is connected via a branch 23 to a transmitting branch with an HF unit or amplifier 11 and a receiving branch with a receiving unit 13, 14 .
- a conventional low-pass filter 20, 21 can be arranged between the RF connection 22 and the branch 23.
- the receiving unit consists of a crossover 13 and receivers 14, 14 for receiving signals of the frequency fl RX or f2 R.
- Arranged between branch 23 and crossover 13 is a switchable through a control terminal D PIN diode 19 for switching the RF signal from the RF terminal 22 to the receiving branch in the receiving mode and for isolating the RF signal to the receiving branch in the transmitting mode.
- a directional coupler 12 can be arranged between the RF unit 11, which has amplifier output stages for the frequencies fl and f2, and the branching point 23. This function is preferably combined with that of the two ⁇ / 8 line transformers 17.
- ⁇ / 4- line elements 15 are arranged as in the switch arrangement of Figure 1, each of which can be short-circuited to ground by means of a PIN diode which can be switched via a control connection A or B. With closed diodes 16, which operate in the forward mode, harmonics of the frequency 2fl are effectively suppressed when the HF unit 11 is operated at the fundamental frequency fl with a low-attenuation transmission of the frequency fl.
- Such low-attenuation transmission of the high-frequency signals from the amplifier output stage to the antenna is particularly important in the case of mobile telephones in which a low power consumption is urgently desired for reasons of space and weight.
- the connection between the ⁇ / 4 line element 15 and ground is interrupted by the diodes 16, the frequency f2, which is in the range of the second harmonic 2fl of the basic frequency fl, can also be transmitted to the HF connection 22 with low attenuation in this switching state .
- the low-pass filter 20, 21 with a correspondingly selected cutoff frequency serves to suppress the harmonics of f2.
- a line element arrangement with two ⁇ / 8 line elements 17 is provided, the connection point 24 of which is in turn connected to ground via a switchable PIN diode 18.
- the switch C In reception mode at frequency fl, the switch C (diode 18) is open, so that the branch 23 at frequency fl is terminated with ⁇ / 2 at idle via the line elements 17, 17, 15.
- the switch C In contrast, the switch C (diode 18) is closed in the receive mode at frequency f2, so that the branching point 23 is terminated with ⁇ 2/4 with respect to ground at the operating frequency f2. This prevents the reception signal from being diverted into the transmission branch.
- the position of the four switches A, B, C and D (diodes 16, 16, 18 and 19) for the respective operating states of the transmitter / receiver in FIG. 2 is shown in the following truth table:
- a 1 means that the switch is closed (diode in forward mode), 0 that the switch is open and - that the switch position is irrelevant.
- FIGS. 3 to 6 A computer simulation of a preferred circuit arrangement according to the invention shown in FIG. 7 with a total of three line element branches 15 is shown in FIGS. 3 to 6.
- the attenuation between the ports [1] and [2] (transmission case) or [2] and [3] (reception case) (reference numerals 25, 26, 27) is plotted as a function of the frequency.
- the spread of the damping values results from a Monte Carlo simulation taking into account a realistic spread of the component parameters.
- Figure 3 shows the frequency response during transmitter operation with a frequency fl (see above truth table). It can be clearly seen from FIG. 3 that the attenuation in the range of the GSM transmission frequency (approx. 900 MHz) is very low, but in the range of the second harmonic is between 40 dB and 60 dB.
- FIG. 5 shows the circuit arrangement according to the invention in reception mode at the lower frequency f1. It is essential that the damping is again as low as possible in the range of the working frequency of 900 MHz.
- FIG. 6 shows the transceiver in the receive mode at the higher frequency f2.
- the attenuation is again minimized in the range of this operating frequency (between 1700 MHz and 1800 MHz).
- the circuit arrangement according to the invention thus enables low-loss transmission and reception operation with simultaneous harmonic suppression at two frequencies fl and f2, the frequency f2 being in the region of a harmonic of the frequency fl, in particular 2fl.
- the invention is particularly applicable to mobile telephones which can be used both in the GSM frequency band and in the PCN frequency band.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99947250A EP1153457A1 (de) | 1999-02-19 | 1999-07-21 | Dämpfungsarme filter/schalteranordnung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19907131 | 1999-02-19 | ||
DE19907131.4 | 1999-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000049675A1 true WO2000049675A1 (de) | 2000-08-24 |
Family
ID=7898140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/002255 WO2000049675A1 (de) | 1999-02-19 | 1999-07-21 | Dämpfungsarme filter/schalteranordnung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1153457A1 (de) |
CN (1) | CN1359549A (de) |
WO (1) | WO2000049675A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1237222A1 (de) * | 2001-02-27 | 2002-09-04 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Mehrband-Transformationsstufe für eine Mehrband-HF-Umschaltvorrichtung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62112401A (ja) * | 1985-11-11 | 1987-05-23 | Sumitomo Electric Ind Ltd | 高調波除去ダイオ−ドスイツチ回路 |
EP0833455A2 (de) * | 1996-09-30 | 1998-04-01 | Nokia Mobile Phones Ltd. | Austauschbare Zubehör-Module für ein Funktelefon |
-
1999
- 1999-07-21 WO PCT/DE1999/002255 patent/WO2000049675A1/de not_active Application Discontinuation
- 1999-07-21 CN CN 99816254 patent/CN1359549A/zh active Pending
- 1999-07-21 EP EP99947250A patent/EP1153457A1/de not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62112401A (ja) * | 1985-11-11 | 1987-05-23 | Sumitomo Electric Ind Ltd | 高調波除去ダイオ−ドスイツチ回路 |
EP0833455A2 (de) * | 1996-09-30 | 1998-04-01 | Nokia Mobile Phones Ltd. | Austauschbare Zubehör-Module für ein Funktelefon |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 11, no. 325 (E - 551) 22 October 1987 (1987-10-22) * |
S.D. CHOI: "HIGH-POWER MICROSTRIP SWITCH", NASA TECH BRIEFS., vol. B73-10451, March 1974 (1974-03-01), NASA. WASHINGTON., US, XP002125239 * |
VINOGRADOV S V ET AL: "LOW-PASS MICROSTRIP FILTERS WITH ELECTRICALLY TUNABLE CHARACTERISTICS", TELECOMMUNICATIONS AND RADIO ENGINEERING,US,BEGELL HOUSE, INC., NEW YORK, NY, vol. 44, no. 1, pages 93-96, XP000136789, ISSN: 0040-2508 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1237222A1 (de) * | 2001-02-27 | 2002-09-04 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Mehrband-Transformationsstufe für eine Mehrband-HF-Umschaltvorrichtung |
WO2002069435A1 (en) * | 2001-02-27 | 2002-09-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiband r. f. switching device |
US7005940B2 (en) | 2001-02-27 | 2006-02-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiband R. F. switching device |
Also Published As
Publication number | Publication date |
---|---|
EP1153457A1 (de) | 2001-11-14 |
CN1359549A (zh) | 2002-07-17 |
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