CN114784471A - Double-frequency filtering power divider from differential to single end - Google Patents
Double-frequency filtering power divider from differential to single end Download PDFInfo
- Publication number
- CN114784471A CN114784471A CN202210414621.9A CN202210414621A CN114784471A CN 114784471 A CN114784471 A CN 114784471A CN 202210414621 A CN202210414621 A CN 202210414621A CN 114784471 A CN114784471 A CN 114784471A
- Authority
- CN
- China
- Prior art keywords
- line
- microstrip
- microstrip line
- shaped
- stepped impedance
- 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.)
- Pending
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 238000002955 isolation Methods 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 8
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 8
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 230000007704 transition Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006880 cross-coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention provides a differential-to-single-ended double-frequency filtering power divider, which aims to improve the out-of-band selectivity and the common mode suppression degree of the differential-to-single-ended double-frequency filtering power divider and comprises a dielectric substrate, wherein a U-shaped input microstrip line and an E-shaped output microstrip line which are opposite in back are printed on the upper surface of the dielectric substrate, a pair of folding stepped impedance resonators which are symmetrical relative to an axis AA ', a first stepped impedance microstrip line and a second stepped impedance microstrip line which are symmetrical relative to the AA' and have the same structure, and the free end of a middle microstrip arm in the E-shaped output microstrip line is connected with an isolation resistor; a metal floor is printed on the lower surface of the medium substrate, a first stepped impedance gap line and a second stepped impedance gap line which are mutually connected are etched on one side of an axis AA ', and a third stepped impedance gap line and a fourth stepped impedance gap line which are mutually connected are etched on the other side of the axis AA'; the isolation resistor is connected with the metal floor through the metalized through hole.
Description
Technical Field
The invention belongs to the technical field of microwave and radio frequency, and relates to a differential-to-single-ended double-frequency filtering power divider which can be applied to a radio frequency front end of a wireless communication system.
Background
In recent years, with the rapid development of communication technology, the demand for miniaturization, multiple functions and low cost of a communication system is increasing, and in a radio frequency front end circuit, a filter and a power divider are often used at the same time, so that the use of a conventional single-function device leads to an increase in the system volume and cost. Therefore, a power divider having a filter characteristic has been widely studied as such a multifunctional device. Meanwhile, in order to satisfy the communication functions of different frequency bands, the dual-frequency/multi-frequency filtering power divider has gradually been studied deeply. Modern wireless systems are facing increasingly complex electromagnetic environments, which makes higher demands on the anti-interference capability of the radio frequency front end. The differential structure has been widely paid attention to and applied by virtue of its obvious advantages in resisting environmental noise and improving the dynamic range of the system. The differential-to-single-ended filtering power divider is an important device for connecting a differential system and a single-ended system, and plays a role in power distribution and filtering, so that the differential-to-single-ended dual-frequency filtering power divider is concerned by numerous scholars at home and abroad more and more, and the research on the differential-to-single-ended dual-frequency filtering power divider has profound significance.
For example, in 2022 He Zhu et al, in IEEE TRANSACTIONS ON circits AND SYSTEMS ii: in the EXPRESS BRIEFS journal (volume.68, No.7, JULY 2021), the article "Dual-Band and Tri-Band-to-Single enhanced Power Dividers With Band Common-Mode Suppression" is published, a differential to single ended dual frequency filtering power divider based on two pairs of uniform impedance resonators is proposed, the microstrip-to-slot structure is adopted, common mode is inhibited in the whole working frequency band, two pairs of uniform impedance resonators are adopted to respectively control two pass bands, but the use of uniform impedance slot lines in the microstrip-to-slot structure of the differential-to-single-ended dual-frequency filtering power divider still results in an insignificant common-mode signal rejection effect, and because the number of the coupling loops introduced between the input port and the output port is small, only four transmission zeros are arranged out of band, and the out-of-band selectivity is poor.
Disclosure of Invention
The present invention provides a differential-to-single-ended dual-band filtering power divider aiming at the deficiencies of the prior art, and aims at improving the out-of-band selectivity and the common mode rejection degree of the differential-to-single-ended dual-band filtering power divider and meeting the requirements of a mobile communication system on excellent performance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a dual-frequency filtering power divider from differential to single-end comprises a rectangular dielectric substrate 1, and a U-shaped input microstrip line 2 and an E-shaped output microstrip line 3 which are printed on the back of the upper surface of the rectangular dielectric substrate 1 and are opposite to each other; a middle line AA 'which is symmetrical relative to a group of opposite sides of the rectangular medium substrate 1 and is used for realizing a pair of folded stepped impedance resonators 4 with double-frequency characteristics, and a first stepped impedance microstrip line 5 and a second stepped impedance microstrip line 6 which are symmetrical relative to the middle line AA' and have the same structure are printed between the U-shaped input microstrip line 2 and the E-shaped output microstrip line 3, the first stepped impedance microstrip line 5 and the second stepped impedance microstrip line 6 are both composed of a quasi-U-shaped microstrip line and a linear microstrip line connected with a long arm of the quasi-U-shaped microstrip line, and each linear microstrip line is coupled with the folded stepped impedance resonators 4 which are positioned on the same side of the linear microstrip line; the free end of the middle microstrip arm of the E-shaped output microstrip line 3 is connected with an isolation resistor 7;
a metal floor 8 is printed on the lower surface of the rectangular medium substrate 1, a first stepped impedance gap line 9 is etched on the metal floor 8 at the projection position of the U-shaped input microstrip line 2, and a second stepped impedance gap line 10 connected with the first stepped impedance gap line 9 is etched on the projection position of the quasi-U-shaped microstrip structure and used for realizing the coupling with the first stepped impedance microstrip line 5; a third stepped impedance slot line 11 is etched at the projection position of the E-shaped output microstrip line 3 of the metal floor 8, and a fourth stepped impedance slot line 12 connected with the third stepped impedance slot line 11 is etched at the projection position of the quasi-U-shaped microstrip structure and used for realizing the coupling with the second stepped impedance microstrip line 6; the second stepped impedance gap line 10 and the fourth stepped impedance gap line 12 are formed by connecting an L-shaped gap line and a first linear gap line;
the isolation resistor 7 is connected with the metal floor 8 through a metalized through hole 13.
Preferably, the U-shaped input microstrip line 2 is formed by connecting a rectangular microstrip bottom parallel to AA 'and two rectangular microstrip arms parallel to a midline BB' of the other group of opposite sides of the rectangular dielectric substrate 1, and the free ends of the two rectangular microstrip arms are used as differential input ports; the E-type output microstrip line 3 is formed by connecting a rectangular microstrip bottom parallel to AA 'and three parallel rectangular microstrip arms, the middle lines of two short sides of the middle rectangular microstrip arm are superposed with BB', the rectangular microstrip bottom is used for realizing the average power distribution, the free ends of the rectangular microstrip arms on two sides are used as single-end output ports, and the middle microstrip arm and an isolation resistor 7 connected with the middle microstrip arm are used for adjusting the isolation degree between the two single-end output ports; two rectangular microstrip arms of the U-shaped input microstrip line 2 and three rectangular microstrip arms of the E-shaped output microstrip line 3 are all 50-ohm impedance line widths; the middle point of the bottom edge of the U-shaped input microstrip line 2 and the middle point of the bottom edge of the E-shaped output microstrip line 3 are positioned on BB'.
Preferably, the first stepped impedance slot line 9 is formed by connecting a first rectangular slot and a second linear slot, the length of the second linear slot is equal to the width of the microstrip bottom of the U-shaped input microstrip line 2, and the stepped line of the first stepped impedance slot line 9 is aligned with the inner edge of the microstrip bottom of the U-shaped input microstrip line 2; the third stepped impedance gap line 11 is formed by connecting a second rectangular gap and a third linear gap, the length of the third linear gap is equal to the width of the E-shaped output microstrip line 3 microstrip bottom, and the stepped line of the third stepped impedance gap line 11 is aligned with the inner edge of the E-shaped output microstrip line 3 microstrip bottom.
Preferably, the first stepped impedance microstrip line 5 includes a connection point of a quasi-U microstrip line and a linear microstrip line, and is aligned with a stepped line of a second stepped impedance slot line 10 etched on the metal floor 8 at a position corresponding to the quasi-U microstrip line; the second stepped impedance microstrip line 6, the connection point of the quasi-U microstrip line and the linear microstrip line included therein, is aligned with the stepped line of the fourth stepped impedance slot line 12 etched on the metal floor 8 at the position corresponding to the quasi-U microstrip line.
Preferably, the folded stepped impedance resonator 4 is formed by connecting two folded microstrip lines having different widths.
Preferably, the two arms of the quasi-U-shaped microstrip line on the first stepped-impedance microstrip line 5 and the second stepped-impedance microstrip line 6 are parallel to AA'.
Preferably, the long arm of the L-shaped slot line on the second stepped impedance slot line 10 and the long arm of the L-shaped slot line on the fourth stepped impedance slot line 12 are parallel to AA'.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the quasi-U-shaped microstrip line of the first stepped impedance microstrip line and the quasi-U-shaped microstrip line of the second stepped impedance microstrip line which are symmetrical about the axis AA 'are printed between the U-shaped input microstrip line and the E-shaped output microstrip line which are opposite to each other on the back of the upper surface of the rectangular dielectric substrate, the L-shaped slot line of the second stepped impedance slot line and the fourth stepped impedance slot line which are symmetrical about the axis AA' are etched on the lower surface of the rectangular dielectric substrate, and the quasi-U-shaped microstrip line and the L-shaped slot lines are mutually coupled, so that seven transmission zeros can be generated at two sides and the middle of a passband from two differential modes to a single end, and the out-band selectivity of the dual-frequency filtering power divider from the differential mode to the single end is improved.
2. According to the invention, the first ladder impedance gap line and the third ladder impedance gap line are adopted, and the ladder-shaped gap lines enhance the coupling capacity of the U-shaped input microstrip line and the E-shaped output microstrip line with the gap lines, so that excellent common-mode signal suppression is realized.
3. The invention adopts a pair of folded stepped impedance resonators as microstrip resonators, can realize two differential modes with adjustable center frequency to a single-ended passband by adjusting the length and the width of two folded microstrip lines with different widths, and has the advantages of small size, simple structure and easy realization.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a diagram showing the relationship between the structures on the upper and lower surfaces of the dielectric substrate according to the present invention;
FIG. 3 is a diagram showing dimensions of various structures on the upper surface of a dielectric substrate according to the present invention;
FIG. 4 is a diagram showing dimensions of various structures on the lower surface of a dielectric substrate according to the present invention;
FIG. 5 is an S-parameter empirical graph of differential mode return loss, differential mode to single ended insertion loss, and isolation of two single ended output ports of the present invention;
FIG. 6 is a diagram of amplitude balance versus phase balance according to the present invention;
figure 7 is an S-parameter map of common mode return loss and common mode to single-ended insertion loss of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, 2, 3 and 4, the present invention includes a rectangular dielectric substrate 1, and a U-shaped input microstrip line 2 and an E-shaped output microstrip line 3 printed on the back of the upper surface of the rectangular dielectric substrate 1, the U-shaped input microstrip line 2 is formed by connecting a rectangular microstrip bottom parallel to AA 'and two rectangular microstrip arms parallel to BB' of a rectangular dielectric substrate 1, the free ends of the two rectangular microstrip arms are used as differential input ports, the E-shaped output microstrip line 3 is formed by connecting a rectangular microstrip bottom parallel to AA 'and three parallel rectangular microstrip arms, the central lines of two short sides of the middle rectangular microstrip arm are superposed with BB', the rectangular microstrip bottom is used for realizing the average distribution of power, the free ends of the rectangular microstrip arms on two sides are used as single-ended output ports, and the middle microstrip arm and the isolation resistor 7 connected with the middle microstrip arm are used for adjusting the isolation between the two single-ended output ports; two rectangular microstrip arms of the U-shaped input microstrip line 2 and three rectangular microstrip arms of the E-shaped output microstrip line 3 are all 50-ohm impedance line widths; the middle point of the bottom edge of the U-shaped input microstrip line 2 and the middle point of the bottom edge of the E-shaped output microstrip line 3 are positioned on BB'; a pair of folded stepped impedance resonators 4 which are symmetrical with respect to AA 'and used for realizing dual-frequency characteristics, and a first stepped impedance microstrip line 5 and a second stepped impedance microstrip line 6 which are symmetrical with respect to AA' and have the same structure are printed between the U-shaped input microstrip line 2 and the E-shaped output microstrip line 3; the folded stepped impedance resonator 4 is formed by connecting two folded microstrip lines with different widths; the first stepped impedance microstrip line 5 and the second stepped impedance microstrip line 6 are both composed of a quasi-U-shaped microstrip line and a linear microstrip line connected with a long arm of the quasi-U-shaped microstrip line, two arms of the quasi-U-shaped microstrip line are parallel to AA' and are not equal in length, wherein the microstrip arm connected with the linear microstrip line is longer, and each linear microstrip line is coupled with the folded stepped impedance resonator 4 positioned on the same side of the linear microstrip line; and the free end of the middle microstrip arm of the E-shaped output microstrip line 3 is connected with an isolation resistor 7.
A metal floor 8 is printed on the lower surface of the rectangular medium substrate 1, a first stepped impedance slot line 9 is etched on the metal floor 8 at the projection position of the U-shaped input microstrip line 2, and a second stepped impedance slot line 10 connected with the first stepped impedance slot line 9 is etched on the projection position of the quasi-U-shaped microstrip structure and used for realizing the coupling with the first stepped impedance microstrip line 5; a third stepped impedance slot line 11 is etched at the projection position of the E-shaped output microstrip line 3 of the metal floor 8, and a fourth stepped impedance slot line 12 connected with the third stepped impedance slot line 11 is etched at the projection position of the quasi-U-shaped microstrip structure and used for realizing the coupling with the second stepped impedance microstrip line 6; the first stepped impedance microstrip line 5 comprises a connection point of a quasi-U-shaped microstrip line and a linear microstrip line, and is aligned with a stepped line of a second stepped impedance gap line 10 etched on a metal floor 8 at a position corresponding to the quasi-U-shaped microstrip line; the second stepped impedance microstrip line 6 comprises a connection point of a quasi-U-shaped microstrip line and a linear microstrip line, and is aligned with a stepped line of a fourth stepped impedance slot line 12 etched on the metal floor 8 at a position corresponding to the quasi-U-shaped microstrip line; the second stepped impedance gap line 10 and the fourth stepped impedance gap line 12 are formed by connecting an L-shaped gap line and a first linear gap line, and the long arm of the L-shaped gap line is parallel to AA'; the first stepped impedance gap line 9 is formed by connecting a first rectangular gap and a second linear gap, the length of the second linear gap is equal to the width of the microstrip bottom of the U-shaped input microstrip line 2, and the stepped line of the first stepped impedance gap line 9 is aligned with the inner edge of the microstrip bottom of the U-shaped input microstrip line 2; the third stepped impedance slot line 11 is formed by connecting a second rectangular slot and a third linear slot, the length of the third linear slot is equal to the width of the bottom of the 3 microstrip of the E-type output microstrip line, and the stepped line of the third stepped impedance slot line 11 is aligned with the inner edge of the bottom of the 3 microstrip of the E-type output microstrip line, wherein the first rectangular slot, the second rectangular slot, the first linear slot line, the second linear slot line and the third linear slot line are all located on BB 'and are symmetrical about BB'.
The isolation resistor 7 is connected with the metal floor 8 through a metalized through hole 13. Wherein:
the rectangular dielectric substrate 1 is made of F4BM-2 material with the relative dielectric constant of 2.2, the size of 46.2mm multiplied by 40.0mm and the thickness of 0.8 mm.
The U-shaped input microstrip line 2 is formed by connecting a rectangular microstrip bottom parallel to the AA 'and two rectangular microstrip arms parallel to the BB' of the rectangular dielectric substrate 1, and the free ends of the two rectangular microstrip arms are used as differential input ports for simultaneously inputting differential mode signals and common mode signals; the E-shaped output microstrip line 3 is formed by connecting a rectangular microstrip bottom parallel to the AA 'and three parallel rectangular microstrip arms, wherein a stepped impedance slot line positioned below the E-shaped output microstrip line 3 is isolated from a middle microstrip arm of the E-shaped output microstrip line 3, signals are coupled to realize transition from the slot line to the microstrip bottom, and good reverse phase power distribution is realized at the microstrip bottom, the middle point of the bottom edge of the U-shaped input microstrip line 2 and the middle point of the bottom edge of the E-shaped output microstrip line 3 are positioned on the BB', the input microstrip arms of the two U-shaped input microstrip lines 2 and the output microstrip arms of the two E-shaped output microstrip lines 3 have the same width and are both 50 omega impedance line widths, so that good feed port matching is ensured. Length L of two microstrip arms of U-shaped input microstrip line 2i1Length L of the base of the micro-strip of 14mmi2W is equal to the width of the micro-strip bottom when the width of the two micro-strip arms is 12mmi1Length L of two microstrip arms of E-type output microstrip line 3 of 2.5mmi3Length L of the base of the micro-strip of 14mmi4Length L of middle microstrip arm of E-type output microstrip line 3 of 12mmi5The widths of three microstrip arms and the microstrip bottom of the E-type output microstrip line 3 are W equal to each other when the microstrip arms and the microstrip bottom are 9mmi2＝2.5mm。
The folded stepped impedance resonator 4 is formed by connecting two folded microstrip lines with different widths, and is used for reducing the size of the microstrip resonator, and the two folded stepped impedance resonators4 symmetrical with respect to axis AA', for realizing a dual-frequency characteristic, length L of the folded microstrip line close to axis AA125.1mm, width W1Length L of folded microstrip line 0.6mm away from axis AA217.8mm, width W20.5mm, the spacing g between folded ladder impedance resonators11mm, the distance between the axis AA 'and the side, away from the axis AA', of the two arms of the U-shaped input microstrip line 2 is 23.1 mm.
The first stepped impedance microstrip line 5 and the second stepped impedance microstrip line 6 are both composed of a quasi-U-shaped microstrip line and a linear microstrip line connected with a long arm of the quasi-U-shaped microstrip line, wherein the quasi-U-shaped microstrip line is used for realizing the transition of differential mode signals from a slot line to the microstrip line, two arms of the quasi-U-shaped microstrip line are parallel to AA' and are not equal in length, the microstrip arm connected with the linear microstrip line is longer, and each linear microstrip line is coupled with the folded stepped impedance resonator 4 positioned on the same side of the linear microstrip line and is used for realizing the transition of the differential mode signals from the microstrip line to the slot line. The widths of the quasi U-shaped microstrip lines of the first stepped impedance microstrip line 5 and the second stepped impedance microstrip line 6 are W30.8mm long arm length L of quasi-U-shaped microstrip line310.6mm, length L of microstrip bottom43.7mm, short arm length L58.8mm, linear microstrip line length L615mm, width W40.5mm, the distance g between the first and second stepped- impedance microstrip lines 5 and 6 and the folded stepped-impedance resonator 420.45mm, partial length L for coupling7＝9mm。
The second stepped impedance slot line 10 and the fourth stepped impedance slot line 12 are both composed of an L-shaped slot line and a first linear slot line, one arm of the L-shaped slot line is parallel to AA' to smoothly realize signal transition between the microstrip lines and the slot lines, and meanwhile, cross coupling is formed between the L-shaped slot line in the two stepped impedance slot lines and the quasi-U-shaped microstrip lines of the first stepped impedance microstrip line 5 and the second stepped impedance microstrip line 6 to generate seven transmission zero points on two sides and in the middle of a passband from two differential modes to a single end, so that the out-of-band selectivity of the differential-to-single-end dual-band filter power divider is increased. Second step impedance gap line 10 and fourth stepThe impedance slot lines 12 are of the same size, wherein the total length L of the L-shaped slot liness115mm, width Ws11mm, first linear gap length Ls23.5mm, width Ws20.2mm, and the distance g between the long arms of the L-shaped slot lines of the second stepped impedance slot line 10 and the fourth stepped impedance slot line 123＝4.2mm。
The first stepped impedance slot line 9 consists of a first rectangular slot and a second linear slot, and forms a signal conversion structure from a microstrip line to a slot line with the U-shaped input microstrip line 2 of the rectangular dielectric substrate 1 right above, so as to transmit a differential mode signal and realize inherent common mode signal suppression, wherein the inner edge of the bottom edge of the U-shaped input microstrip line 2 is aligned with the stepped line of the first stepped impedance slot line 9, and the length of the second linear slot is the same as the width of the bottom edge of the U-shaped input microstrip line 2, so that signal transition is ensured; the third stepped impedance slot line 11 is composed of a second rectangular slot and a third linear slot, and forms a signal conversion structure from the slot line to the microstrip line with the E-shaped output microstrip line 3 of the rectangular dielectric substrate 1 right above, so as to transmit a differential mode signal and realize inherent common mode signal suppression, wherein the inner edge of the bottom edge of the E-shaped output microstrip line 3 is aligned with the stepped line of the third stepped impedance slot line 11, and the length of the third linear slot is the same as the width of the bottom edge of the E-shaped output microstrip line 3, so as to ensure signal transition. First rectangular gap length Ls38mm, width Ws35.5mm, the second linear gap and the third linear gap have the same size and the length Ls42.5mm, width Ws40.4mm, second rectangular gap length Ls58mm, width Ws5＝2.1mm。
The isolation resistor 7 is connected with the metal floor 8 through a metalized through hole 13, the resistance value of the isolation resistor 7 is 117ohm, and the isolation resistor and the middle microstrip arm of the E-shaped output microstrip line 3 are used for adjusting the isolation degree between the output ports.
The working principle of the invention is as follows: when signals are input by the U-shaped input microstrip line, microstrip differential mode signals in the signals excite an electric field of the first stepped impedance slot line below the input microstrip line, and microstrip common mode signals cannot excite an electric field of the first stepped impedance slot line, so that only differential mode signals are transmitted to the second stepped impedance slot line through the U-shaped input microstrip line, common mode signals are inhibited, the L-shaped slot line of the second stepped impedance slot line, the L-shaped slot line of the fourth stepped impedance slot line, the quasi-U-shaped microstrip line of the first stepped impedance microstrip line and the quasi-U-shaped microstrip line of the second stepped impedance microstrip line form cross coupling, seven transmission zeros can be generated in a stop band, the differential mode signals are transmitted to the first stepped impedance microstrip line on the upper layer through a transition structure from the second stepped impedance slot line to the first stepped impedance microstrip line and are transmitted to the folded stepped impedance resonator through the linear microstrip line parallel to the axis AA', the differential mode signal is finally divided into two paths of single-ended signals through the microstrip bottom of the E-shaped output microstrip line, the two paths of single-ended signals are output through rectangular microstrip arms on two sides of the E-shaped output microstrip line, and the middle microstrip arm of the E-shaped output microstrip line and the isolation resistor are used for adjusting the isolation degree between the output ports.
The technical effects of the present invention will be further explained by combining the actual measurement results as follows:
1. experimental conditions and contents:
the vector network analyzer N5230A was used to measure the relevant performance indicators of the present invention:
experiment one, measuring the differential mode return loss of the invention
Differential to single ended insertion loss
And isolation of two single-ended output ports
The results are shown in FIG. 5;
experiment two, the amplitude balance and the phase balance of the invention are measured, and the result is shown in figure 6;
experiment three, measuring the common mode return loss of the invention
And common mode to single ended insertion loss
The results are shown in FIG. 7.
2. And (3) analyzing an experimental result:
referring to fig. 5, the center frequencies of the two pass bands in this embodiment are 2.86GHz and 5.47GHz, respectively; maximum differential mode return loss in the first pass band
22.1dB, minimum differential mode to single-ended insertion loss
Is 3.57 dB; maximum differential mode return loss in the second pass band
38.9dB, minimum differential mode to single-ended insertion loss
Is 3.88 dB; there is one transmission zero on the left side of the passband from the first differential mode to the single end, which is located at 2.64GHz, there are 4 transmission zeros between the two differential mode to single end passbands, which are located at 3.11GHz, 3.61GHz, 4.64GHz, and 5.20GHz, respectively, and there are two transmission zeros on the right side of the passband from the second differential mode to the single end, which are located at 5.88GHz and 6.55GHz, as can be seen from fig. 5, the seven transmission zeros significantly improve the out-of-band selectivity.
Fig. 6 is a diagram showing an amplitude balance and a phase balance of a differential-to-single-ended dual-band filter power divider, in this embodiment, in two passbands, an amplitude difference between two output ports is smaller than ± 0.5dB, and a phase difference between two output ports is 180 ° ± 4 °, as can be seen from fig. 6, the differential-to-single-ended dual-band filter power divider realizes good inverse power distribution.
FIG. 7 is a diagram of common mode return loss for a differential to single ended dual frequency filtering power divider
And common mode to single ended insertion loss
S parameter of (1), common mode return loss in this embodiment
Less than or equal to 0.4dB in working frequency range, and common mode to single end insertion loss
Greater than or equal to 40.0dB, it can be seen from fig. 7 that the differential to single-ended dual-frequency filtering power divider achieves significant common mode rejection.
Claims (7)
1. A dual-frequency filtering power divider from differential to single-end comprises a rectangular dielectric substrate (1), and a U-shaped input microstrip line (2) and an E-shaped output microstrip line (3) which are printed on the upper surface of the rectangular dielectric substrate (1) and are opposite to each other at the back; the dual-band planar microstrip line is characterized in that a middle line AA ' which is symmetrical relative to a group of opposite sides of a rectangular medium substrate (1) and is used for realizing dual-frequency characteristics is printed between a U-shaped input microstrip line (2) and an E-shaped output microstrip line (3), a pair of folded stepped impedance resonators (4) which are symmetrical relative to the middle line AA ' and are used for realizing dual-frequency characteristics, and a first stepped impedance microstrip line (5) and a second stepped impedance microstrip line (6) which are symmetrical relative to the middle line AA ' and have the same structure, wherein the first stepped impedance microstrip line (5) and the second stepped impedance microstrip line (6) are both composed of a quasi-U-shaped microstrip line and a linear microstrip line connected with a long arm of the quasi-U-shaped microstrip line, and each linear microstrip line is coupled with the folded stepped impedance resonator (4) positioned on the same side of the quasi-U-shaped microstrip line; the free end of the middle microstrip arm of the E-shaped output microstrip line (3) is connected with an isolation resistor (7);
a metal floor (8) is printed on the lower surface of the rectangular medium substrate (1), a first stepped impedance slot line (9) is etched on the metal floor (8) at the projection position of the U-shaped input microstrip line (2), and a second stepped impedance slot line (10) connected with the first stepped impedance slot line (9) is etched on the projection position of the quasi-U-shaped microstrip structure and used for realizing the coupling with the first stepped impedance microstrip line (5); a third stepped impedance gap line (11) is etched at the projection position of the E-shaped output microstrip line (3) of the metal floor (8), and a fourth stepped impedance gap line (12) connected with the third stepped impedance gap line (11) is etched at the projection position of the quasi-U-shaped microstrip structure and used for realizing the coupling with the second stepped impedance microstrip line (6); the second stepped impedance gap line (10) and the fourth stepped impedance gap line (12) are formed by connecting an L-shaped gap line and a first linear gap line;
the isolation resistor (7) is connected with the metal floor (8) through a metalized through hole (13).
2. The differential-to-single-ended dual-frequency filtering power divider according to claim 1, wherein the U-shaped input microstrip line (2) is formed by connecting a rectangular microstrip bottom parallel to AA 'and two rectangular microstrip arms parallel to a middle line BB' of the other pair of paired edges of the rectangular dielectric substrate (1), and the free ends of the two rectangular microstrip arms are used as differential input ports; the E-type output microstrip line (3) is formed by connecting a rectangular microstrip bottom parallel to AA 'and three parallel rectangular microstrip arms, the middle lines of two short sides of the middle rectangular microstrip arm are superposed with BB', the rectangular microstrip bottom is used for realizing the average power distribution, the free ends of the rectangular microstrip arms on two sides are used as single-end output ports, and the middle microstrip arm and an isolation resistor (7) connected with the middle microstrip arm are used for adjusting the isolation degree between the two single-end output ports; two rectangular microstrip arms of the U-shaped input microstrip line (2) and three rectangular microstrip arms of the E-shaped output microstrip line (3) are all in 50-ohm impedance line width; the middle point of the bottom edge of the U-shaped input microstrip line (2) and the middle point of the bottom edge of the E-shaped output microstrip line (3) are positioned on BB'.
3. The differential-to-single-ended dual-frequency filtering power divider according to claim 1, wherein the first stepped impedance slot line (9) is formed by connecting a first rectangular slot and a second linear slot, the length of the second linear slot is equal to the width of the microstrip bottom of the U-shaped input microstrip line (2), and the stepped line of the first stepped impedance slot line (9) is aligned with the inner edge of the microstrip bottom of the U-shaped input microstrip line (2); the third stepped impedance gap line (11) is formed by connecting a second rectangular gap and a third linear gap, the length of the third linear gap is equal to the width of the microstrip bottom of the E-shaped output microstrip line (3), and the stepped line of the third stepped impedance gap line (11) is aligned with the inner edge of the microstrip bottom of the E-shaped output microstrip line (3).
4. The differential-to-single-ended dual-frequency filtering power divider according to claim 1, wherein the first stepped impedance microstrip line (5) comprises a connection point of a quasi-U-shaped microstrip line and a linear microstrip line, and is aligned with a stepped line of a second stepped impedance slot line (10) etched on the metal floor (8) at a position corresponding to the quasi-U-shaped microstrip line; and the second stepped impedance microstrip line (6) comprises a connection point of a quasi U-shaped microstrip line and a linear microstrip line, and is aligned with a stepped line of a fourth stepped impedance slot line (12) etched on the metal floor (8) at a position corresponding to the quasi U-shaped microstrip line.
5. The differential-to-single-ended dual-band filtering power divider as claimed in claim 1, wherein said folded ladder impedance resonator (4) is formed by connecting two folded microstrip lines with different widths.
6. The differential-to-single ended dual-band filtering power divider as claimed in claim 1, wherein the first and second stepped-impedance microstrip lines (5, 6) have two arms of a quasi-U-shaped microstrip line parallel to AA'.
7. A differential-to-single ended dual frequency filtering power divider as claimed in claim 1, characterized in that the second (10) and fourth (12) ladder impedance slot lines have their long arms of L-shaped slot lines parallel to AA'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210414621.9A CN114784471A (en) | 2022-04-15 | 2022-04-15 | Double-frequency filtering power divider from differential to single end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210414621.9A CN114784471A (en) | 2022-04-15 | 2022-04-15 | Double-frequency filtering power divider from differential to single end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114784471A true CN114784471A (en) | 2022-07-22 |
Family
ID=82430973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210414621.9A Pending CN114784471A (en) | 2022-04-15 | 2022-04-15 | Double-frequency filtering power divider from differential to single end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114784471A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115332746A (en) * | 2022-08-25 | 2022-11-11 | 西安电子科技大学 | Single-ended to differential miniaturized filtering power divider |
| CN116598738A (en) * | 2023-07-17 | 2023-08-15 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
| RU2817507C1 (en) * | 2023-12-20 | 2024-04-16 | Самсунг Электроникс Ко., Лтд. | Microwave signal power divider and antenna array |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467063A (en) * | 1993-09-21 | 1995-11-14 | Hughes Aircraft Company | Adjustable microwave power divider |
| US6043722A (en) * | 1998-04-09 | 2000-03-28 | Harris Corporation | Microstrip phase shifter including a power divider and a coupled line filter |
| US20060022866A1 (en) * | 2002-01-17 | 2006-02-02 | The Ohio State University | Vehicle obstacle warning radar |
| US20070216494A1 (en) * | 2006-03-14 | 2007-09-20 | Lockheed Martin Corporation | Dynamic, non frequency dispersive, RF power division by means of variable dielectric material properties |
| JP2008046657A (en) * | 2007-09-28 | 2008-02-28 | Hitachi Chem Co Ltd | S-shape curved optical waveguide and optical device |
| WO2008099707A1 (en) * | 2007-02-16 | 2008-08-21 | Sanyo Electric Co., Ltd. | Optical pickup device and recording/reproduction device |
| WO2011119369A2 (en) * | 2010-03-26 | 2011-09-29 | Altera Corporation | Integrated circuits with configurable inductors |
| US8648669B1 (en) * | 2012-08-15 | 2014-02-11 | Werlatone, Inc. | Planar transmission-line interconnection and transition structures |
| US20140240056A1 (en) * | 2013-02-26 | 2014-08-28 | Raytheon Company | Symmetric Baluns and Isolation Techniques |
| US20170214380A1 (en) * | 2016-01-25 | 2017-07-27 | Hyundai Motor Company | Power divider |
| CN109244616A (en) * | 2018-09-27 | 2019-01-18 | 西安电子科技大学 | Double frequency based on coupled microstrip line not equal part model filters power splitter |
| CN111817001A (en) * | 2020-07-14 | 2020-10-23 | 电子科技大学 | Ka wave band is based on 1X 4 plane phased array of liquid crystal reflection formula looks ware |
| CN112768854A (en) * | 2020-12-29 | 2021-05-07 | 西安空间无线电技术研究所 | High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator |
| CN114204256A (en) * | 2021-11-29 | 2022-03-18 | 广东工业大学 | Broadband high-isolation patch antenna applied in full duplex and wireless communication equipment |
-
2022
- 2022-04-15 CN CN202210414621.9A patent/CN114784471A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467063A (en) * | 1993-09-21 | 1995-11-14 | Hughes Aircraft Company | Adjustable microwave power divider |
| US6043722A (en) * | 1998-04-09 | 2000-03-28 | Harris Corporation | Microstrip phase shifter including a power divider and a coupled line filter |
| US20060022866A1 (en) * | 2002-01-17 | 2006-02-02 | The Ohio State University | Vehicle obstacle warning radar |
| US20070216494A1 (en) * | 2006-03-14 | 2007-09-20 | Lockheed Martin Corporation | Dynamic, non frequency dispersive, RF power division by means of variable dielectric material properties |
| WO2008099707A1 (en) * | 2007-02-16 | 2008-08-21 | Sanyo Electric Co., Ltd. | Optical pickup device and recording/reproduction device |
| JP2008046657A (en) * | 2007-09-28 | 2008-02-28 | Hitachi Chem Co Ltd | S-shape curved optical waveguide and optical device |
| WO2011119369A2 (en) * | 2010-03-26 | 2011-09-29 | Altera Corporation | Integrated circuits with configurable inductors |
| US8648669B1 (en) * | 2012-08-15 | 2014-02-11 | Werlatone, Inc. | Planar transmission-line interconnection and transition structures |
| US20140240056A1 (en) * | 2013-02-26 | 2014-08-28 | Raytheon Company | Symmetric Baluns and Isolation Techniques |
| US20170214380A1 (en) * | 2016-01-25 | 2017-07-27 | Hyundai Motor Company | Power divider |
| CN109244616A (en) * | 2018-09-27 | 2019-01-18 | 西安电子科技大学 | Double frequency based on coupled microstrip line not equal part model filters power splitter |
| CN111817001A (en) * | 2020-07-14 | 2020-10-23 | 电子科技大学 | Ka wave band is based on 1X 4 plane phased array of liquid crystal reflection formula looks ware |
| CN112768854A (en) * | 2020-12-29 | 2021-05-07 | 西安空间无线电技术研究所 | High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator |
| CN114204256A (en) * | 2021-11-29 | 2022-03-18 | 广东工业大学 | Broadband high-isolation patch antenna applied in full duplex and wireless communication equipment |
Non-Patent Citations (2)
| Title |
|---|
| HE ZHU: "Dual-band and Tri-band Balanced-to-Single-Ended Power Dividers with Wideband Common-mode Suppression", 《IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: EXPRESS BRIEFS》, pages 2332 - 2334 * |
| 蔡文新;潘健;: "双平衡式微波鉴相器的模拟研究与电路实现", 大众科技, no. 09 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115332746A (en) * | 2022-08-25 | 2022-11-11 | 西安电子科技大学 | Single-ended to differential miniaturized filtering power divider |
| CN116598738A (en) * | 2023-07-17 | 2023-08-15 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
| CN116598738B (en) * | 2023-07-17 | 2023-10-13 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
| RU2817507C1 (en) * | 2023-12-20 | 2024-04-16 | Самсунг Электроникс Ко., Лтд. | Microwave signal power divider and antenna array |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110444840B (en) | Double-frequency differential band-pass filter based on stub load resonator | |
| CN109755702B (en) | Four-frequency differential band-pass filter | |
| CN109546272B (en) | Double-frequency differential band-pass filter | |
| CN114784471A (en) | Double-frequency filtering power divider from differential to single end | |
| CN115332746B (en) | Single-ended to differential miniaturized filtering power divider | |
| CN108270061B (en) | Differential power divider with filtering characteristic | |
| CN111769347B (en) | Differential ultra-wideband band-pass filter based on multimode slot line resonator | |
| CN110380168B (en) | Unbalanced-to-balanced dual-broadband power division filter | |
| CN111864321A (en) | Balanced dual-passband filter based on stub loading slot line resonator | |
| CN114284673B (en) | Substrate integrated waveguide dual-band filtering balun | |
| CN108736120B (en) | Half-mode substrate integrated waveguide attenuator based on surface-mounted resistor type | |
| CN112768854B (en) | High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator | |
| CN112350042B (en) | Single-ended to differential magic T with filtering characteristics | |
| CN113708030B (en) | Balance ultra-wideband band-pass filter based on multimode slot line resonator | |
| CN111540996A (en) | Flexible power division ratio dual-band branch line millimeter wave coupler based on ridge gap waveguide | |
| CN115275545B (en) | Compact absorption type filtering power divider | |
| CN113224494B (en) | Dual-band power unequal directional coupler based on microstrip-slot line coupling line | |
| CN113540726B (en) | Differential double-frequency duplex power divider using novel matching network | |
| CN112886174B (en) | Four-way millimeter wave isolation characteristic isolation-free resistance power divider | |
| CN109586017B (en) | A kind of wideband MIMO differential filtering slot antenna | |
| CN209948010U (en) | Ultra-wideband filter with miniaturized broadside coupling structure | |
| CN113922020A (en) | Broadband high-rejection dual-passband filter composed of C-type resonators | |
| CN113708026B (en) | Differential 90-degree Scheffman phase shifter based on slot line | |
| Gu et al. | Miniaturization and harmonic suppression open-loop resonator bandpass filter with capacitive terminations | |
| CN111613856A (en) | Double-passband balance filter adopting double-layer circular patch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |