CN105826640B - A kind of bimodulus balun bandpass filter based on multimode resonator - Google Patents
A kind of bimodulus balun bandpass filter based on multimode resonator Download PDFInfo
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Abstract
The invention discloses a kind of bimodulus balun bandpass filter based on multimode resonator, including input terminal feeder line, Two-port netwerk output end feeder line, three port output end feeder lines, the first multimode resonator, the second multimode resonator, medium substrate, metal ground plate, the first multimode resonator and the second multimode resonator are the multimode resonator of plane of symmetry minor matters load；Wherein input terminal feeder line, Two-port netwerk output end feeder line, three port output end feeder lines, the first multimode resonator and the second multimode resonator are located at the upper surface of medium substrate, and metal ground plate is located at the lower surface of medium substrate；First multimode resonator includes two quarter-wave resonance devices, two plane of symmetry minor matters loading units, and the second multimode resonator includes two quarter-wave resonance devices, two plane of symmetry minor matters loading units.Balun bandpass filter structures of the present invention are simple, loss is low, selectivity is good, have preferable port match characteristic, are highly suitable for modern wireless communication systems.
Description
Technical field
The present invention relates to microwave passive component technical field, especially a kind of bimodulus balun band logical based on multimode resonator
Filter.
Background technique
In recent years, with modular structural units (Modular Building Block, MBB) and monolithic integrated microwave circuit
The development of (Monolithic Microwave Integrated Circuit, MMIC), inexpensive, highly integrated, miniaturization are
Have become very important Consideration in modern wireless communication systems Integrated design.To realize these design objects, have
The novel passive microwave device of multifunctional unit characteristic is just becoming current research hotspot both domestic and external, one of them is very popular
Project is exactly the design of high-performance balun filter.
Balun filter is an independent microwave passive component, it functionally realize in radio circuit filter and
Effective combination of balun, that is to say, that the function that balun filter has had both the filtering of signal and the constant amplitude of power is reversely distributed
Energy.Therefore, high performance balun filter can not only effectively reduce the size of system, and can simplify answering for system design
Miscellaneous degree, to further realize the low cost of wireless communication system, high-performance, Miniaturization Design.
2007, Lap Kun Yeung and Ke-Li Wu was in IEEE Transaction.Microwave Theory
" A Dual-Band Coupled-Line is delivered on Technique periodical (vol.55, no.11, pp.2406-2411,2007)
Balun Filter " proposes to come in the theoretical basis of Marchand balun in conjunction with the resonance characteristic of step electric impedance resonator real
The design method of existing balun filter.Although this design method design theory is relatively simple, since the structure introduces
Step electric impedance resonator, so that the narrower bandwidth of designed balun filter.Further, since the circuit is related to three line couplings
It closes, so that the stiffness of coupling between step electric impedance resonator and main transmission line must be enhanced using zigzag coupled mode, because
The structure of this balun filter is more complex, and circuit size is also larger.
2007, Eul-Young Jung and Hee-Yong Hwang were in IEEE Microwave Wireless
" A Balun-BPF Using a is delivered on Components Letters periodical (vol.17, no.9, pp.652-654,2007)
Dual Mode Ring Resonator ", proposition is symmetrically positioned two output ports on toroidal cavity resonator, while introducing and opening
Short out transversal realizes the Differential Output of signal and the bandpass characteristics of bimodulus, still, since the structure introduces stepping impedance,
Keep structure no longer symmetrical, causes the Differential Output performance of balun filter poor, simultaneously because it is not introduced into capacitive load, the balun
The size of filter is larger.
2008, Vicente Gonz á lez-Posadas, Carlos Mart í n-Pascual, Jos é Luis Jim é
Nez-Mart í n, and Daniel Segovia-Vargas is in IEEE Transactions on Antennas and
" Lumped-Element Balun is delivered on Propagation periodical (vol.01, no.56, pp.2101-2107,2008)
For UHF UWB Printed Balanced Antennas " proposes to pass through being collocated with each other between low pass and high-pass filter
Method to design balun filter.Although the balun of this design method design have the advantages that in low-frequency range it is small in size,
It is the correlation properties due to lamped element, its also lossy big, narrower bandwidth and amplitude and the not high disadvantage of the phase goodness of fit.
Summary of the invention
The purpose of the present invention is the field distributions of the main transmission line of the resonance mechanism and open-end using multimode resonator
Characteristic is filtered to provide the bimodulus balun band logical that a kind of structure is simple, loss is low, selectivity is good, with preferable port match performance
Wave device.
The technical solution for realizing the aim of the invention is as follows: a kind of bimodulus balun bandpass filtering based on multimode resonator
Device, including input terminal feeder line, Two-port netwerk output end feeder line, three port output end feeder lines, the first multimode resonator, the second multimode are humorous
Shake device, medium substrate, metal ground plate, and the first multimode resonator and the second multimode resonator are the more of plane of symmetry minor matters load
Mould resonator；Wherein input terminal feeder line, Two-port netwerk output end feeder line, three port output end feeder lines, the first multimode resonator and
Two multimode resonators are located at the upper surface of medium substrate, and metal ground plate is located at the lower surface of medium substrate；First multimode resonance
Device includes the first quarter-wave resonance device, the second quarter-wave resonance device, the first plane of symmetry minor matters loading unit, the
Two plane of symmetry minor matters loading units, the second multimode resonator include third quarter-wave resonance device, the 4th quarter-wave
Long resonator, third plane of symmetry minor matters loading unit, the 4th plane of symmetry minor matters loading unit.
The input terminal feeder line includes the main biography of a wavelength of 50 ohm microstrip conduction band of input terminal and open-end
Defeated line；Two-port netwerk output end feeder line includes 50 ohm microstrip conduction band of Two-port netwerk output end and Two-port netwerk output end quarter-wave
Long coupling line；Three port output end feeder lines include three port output ends, 50 ohm microstrip conduction band and three port output ends four/
One wave coupled-line；The main transmission line of one wavelength of input terminal is in the quarter-wave strong point and more than first apart from Single port feed point
First quarter-wave resonance device parallel coupling of mould resonator, the main transmission line of one wavelength of input terminal is apart from Single port
At 3/4ths wavelength of feed point with the 4th quarter-wave resonance device parallel coupling of the second multimode resonator；Two-port netwerk is defeated
Second quarter-wave resonance device parallel coupling of outlet quarter-wave coupling line and the first multimode resonator；Three ports
The third quarter-wave resonance device parallel coupling of output end quarter-wave coupling line and the second multimode resonator.
The structure size of the Two-port netwerk output end feeder line and three port output end feeder lines is identical, the first multimode resonator and
Second multimode resonator is the multimode resonator of the identical plane of symmetry minor matters load of structure size.
First quarter-wave resonance device of first multimode resonator and the second quarter-wave resonance device phase
Mutually vertical, the first plane of symmetry minor matters loading unit, the second plane of symmetry minor matters loading unit are connected with each other, and respectively with the one or four point
One of wave resonator, the second quarter-wave resonance device be distributed at 45 degree of angles, the second multimode resonator the three or four/
One wave resonator, the 4th quarter-wave resonance device are mutually perpendicular to, third plane of symmetry minor matters loading unit, the 4th plane of symmetry
Minor matters loading unit be connected with each other, and respectively with third quarter-wave resonance device, the 4th quarter-wave resonance device at
45 degree of angle distributions.
Compared with prior art, the present invention its remarkable advantage are as follows: (1) structure is simple, can realize on monolithic pcb board, just
In process, production cost is low；(2) have the function of providing the filtering in constant amplitude reverse signal, impedance matching and frequency, be
The RF components such as balancing antenna no longer need to when feeding using impedance matching section and filter；(3) selectivity is good, insertion loss is small,
Output port has the characteristics such as matched well performance.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the bimodulus balun bandpass filter the present invention is based on multimode resonator.
Fig. 2 is the overlooking structure diagram of the bimodulus balun bandpass filter the present invention is based on multimode resonator.
Fig. 3 is the structure size schematic diagram of the bimodulus balun bandpass filter embodiment 1 the present invention is based on multimode resonator.
Fig. 4 is the S parameter analogous diagram of the multimode balun bandpass filter embodiment 1 the present invention is based on multimode resonator.
Fig. 5 is two output port width of the bimodulus balun bandpass filter embodiment 1 the present invention is based on multimode resonator
Spend the analogous diagram of difference.
Fig. 6 is a kind of two output ends of the bimodulus balun bandpass filter embodiment 1 based on multimode resonator of the present invention
The analogous diagram of mouth phase difference.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments.
In conjunction with Fig. 1~2, the present invention is based on the bimodulus balun bandpass filter of multimode resonator, including input terminal feeder line 1,
Two-port netwerk output end feeder line 2, three port output end feeder lines 3, the first multimode resonator 4, the second multimode resonator 5, medium substrate
6, metal ground plate 7, the first multimode resonator 4 and the second multimode resonator 5 are the multimode resonator of plane of symmetry minor matters load；
Wherein input terminal feeder line 1, Two-port netwerk output end feeder line 2, three port output end feeder lines 3, the first multimode resonator 4 and the second multimode
Resonator 5 is located at the upper surface of medium substrate 6, and metal ground plate 7 is located at the lower surface of medium substrate 6；First multimode resonator 4
Include the first quarter-wave resonance device 41, the second quarter-wave resonance device 42, the first plane of symmetry minor matters loading unit
43, the second plane of symmetry minor matters loading unit 44, the second multimode resonator 5 include third quarter-wave resonance device the 51, the 4th
Quarter-wave resonance device 52, third plane of symmetry minor matters loading unit 53, the 4th plane of symmetry minor matters loading unit 54.
The input terminal feeder line 1 includes the master of a wavelength of 50 ohm microstrip conduction band 11 of input terminal and open-end
Transmission line 12；Two-port netwerk output end feeder line 2 includes 50 ohm microstrip conduction band 21 of Two-port netwerk output end and Two-port netwerk output end four
/ mono- wave coupled-line 22；Three port output end feeder lines 3 include three port output ends, 50 ohm microstrip conduction band 31 and three ends
Mouth output end quarter-wave coupling line 32；The main transmission line 12 of one wavelength of input terminal is apart from four points of Single port feed point
One of at wavelength with 41 parallel coupling of the first quarter-wave resonance device of the first multimode resonator 4, one wavelength of input terminal
Main transmission line 12 at 3/4ths wavelength apart from Single port feed point with the 4th quarter-wave of the second multimode resonator 5
Long 52 parallel coupling of resonator；The two or four of Two-port netwerk output end quarter-wave coupling line 22 and the first multimode resonator 4
42 parallel coupling of/mono- wave resonator；Three port output end quarter-wave coupling lines 32 and the second multimode resonator 5
51 parallel coupling of third quarter-wave resonance device.
The Two-port netwerk output end feeder line 2 is identical with the structure size of three port output end feeder lines 3, the first multimode resonator
4 and second multimode resonator 5 be structure size identical plane of symmetry minor matters load multimode resonator.
The the first quarter-wave resonance device 41 and the second quarter-wave resonance device of first multimode resonator 4
42 are mutually perpendicular to, the first plane of symmetry minor matters loading unit 43, the second plane of symmetry minor matters loading unit 44 be connected with each other, and respectively with
First quarter-wave resonance device 41, the second quarter-wave resonance device 42 are distributed at 45 degree of angles, the second multimode resonator 5
Third quarter-wave resonance device 51, the 4th quarter-wave resonance device 52 be mutually perpendicular to, third plane of symmetry minor matters add
Carrier unit 53, the 4th plane of symmetry minor matters loading unit 54 are connected with each other, and respectively with third quarter-wave resonance device 51, the
Four quarter-wave resonance devices 52 are distributed at 45 degree of angles.
The present invention is based on the bimodulus balun bandpass filters of multimode resonator, wherein the first multimode resonator more than 4 and second
The first quarter-wave resonance device 41, the second quarter-wave resonance device 42, third quarter-wave of mould resonator 5
Resonator 51, the 4th quarter-wave resonance device 52 length and width determine the position of passband, adjust first plane of symmetry
Minor matters loading unit 43, the second plane of symmetry minor matters loading unit 44, third plane of symmetry minor matters loading unit 53, the 4th plane of symmetry branch
Section loading unit 54 can change the position of two modes, so that passband is more flat；The main biography of one wavelength of input terminal
The spacing of defeated line 12 and the first quarter-wave resonance device 41 of coupling in parallel, the 4th quarter-wave resonance device 52
The intensity effect coupled to it is larger, and the smaller stiffness of coupling of spacing is bigger, and the amplitude and phase goodness of fit of two output ports is got over
It is high.
The present invention is based on the bimodulus balun bandpass filters of multimode resonator, manufacture work by printed circuit board in manufacture
Skill carries out processing corrosion to the metal covering in circuit substrate front and the back side to metal pattern needed for formation.
Present invention is further described in detail combined with specific embodiments below.
Embodiment 1
The structure of bimodulus balun bandpass filter based on multimode resonator as shown in Figure 1, top view as shown in Fig. 2, having
It is as shown in Figure 3 to close dimensions.Used 7 relative dielectric constant of medium substrate is 3.38, with a thickness of 0.635mm, loss angle
Just it is cut to 0.0035.50 ohm microstrip conduction band 11 of input terminal, 50 ohm microstrip conduction band 21 of Two-port netwerk output end and three ports
The characteristic impedance of 50 ohm microstrip conduction band 31 of output end is 50 ohm, and width is W1=1.4mm.In conjunction with Fig. 3, balun
Each dimensional parameters of filter are as follows: W1=1.4mm, L1=4mm, W2=1.2mm, L2=69mm, W3=1.4mm, L3=4mm,
W4=0.7mm, L4=14.35mm, W5=0.7mm, L5=28.3mm, W6=0.6mm, L6=1.2mm, W7=1.6mm, L7=
2.6mm, S1=0.1mm, S2=0.1mm.The entire area of balun filter be 35 × 75mm, corresponding guide wavelength having a size of
0.75λg×1.63λg, wherein λgFor the corresponding guide wavelength of passband central frequency.
This example balun filter is the modeling and simulating in electromagnetic simulation software HFSS.13.Fig. 4 is balun in this example
The S parameter analogous diagram of filter, it can be seen from the figure that the passband central frequency of the balun filter is 3.45GHz, opposite band
Width is 17.4%, and return loss is lower than 15dB in passband.There are four transmission zeros, and the example balun is filtered respectively outside passband
Device has selectivity well.
Fig. 5 is two Differential Output port amplitude differences of balun filter in this example, it can be seen from the figure that the example
Two Differential Output port amplitude differences in balun filter passband are within 0.4dB.
Fig. 6 is two Differential Output port phase differences of balun filter in this example, it can be seen from the figure that the example
Two Differential Output port phase differences in balun filter passband are within 180 ± 5 degree.
In conclusion the present invention is based on the bimodulus balun bandpass filters of multimode resonator, in conjunction with multimode resonator and end
Holding the Field distribution characteristic of the transmission line of open circuit to realize, a kind of structure is simple, loss is low, selectivity is good, has preferable port
Bimodulus balun bandpass filter with performance, the balun filter are highly suitable for modern wireless communication systems.
Claims (2)
1. a kind of bimodulus balun bandpass filter based on multimode resonator, it is characterised in that: including input terminal feeder line (1),
Two-port netwerk output end feeder line (2), third port output end feeder line (3), the first multimode resonator (4), the second multimode resonator
(5), medium substrate (6), metal ground plate (7), the first multimode resonator (4) and the second multimode resonator (5) are the plane of symmetry
The multimode resonator of minor matters load；Wherein input terminal feeder line (1), second port output end feeder line (2), the feedback of third port output end
Line (3), the first multimode resonator (4) and the second multimode resonator (5) are located at the upper surface of medium substrate (6), metal ground plate
(7) it is located at the lower surface of medium substrate (6)；First multimode resonator (4) includes the first quarter-wave resonance device (41), the
Two quarter-wave resonance devices (42), the first plane of symmetry minor matters loading unit (43), the second plane of symmetry minor matters loading unit
(44), the second multimode resonator (5) includes third quarter-wave resonance device (51), the 4th quarter-wave resonance device
(52), third plane of symmetry minor matters loading unit (53), the 4th plane of symmetry minor matters loading unit (54)；
The input terminal feeder line (1) includes the master of a wavelength of 50 ohm microstrip conduction band (11) of input terminal and open-end
Transmission line (12)；Second port output end feeder line (2) includes 50 ohm microstrip conduction band (21) of second port output end and second
Port output end quarter-wave coupling line (22)；Third port output end feeder line (3) includes 50 Europe of third port output end
Nurse microstrip line conduction band (31) and third port output end quarter-wave coupling line (32)；The main transmission of one wavelength of input terminal
Line (12) is in the quarter-wave strong point of distance input port feed point and first quarter-wave of the first multimode resonator (4)
Resonator (41) parallel coupling, 3/4ths waves of the main transmission line (12) of one wavelength of input terminal in distance input port feed point
The 4th quarter-wave resonance device (52) parallel coupling of strong point and the second multimode resonator (5)；Second port output end four
Second quarter-wave resonance device (42) parallel coupling of/mono- wave coupled-line (22) and the first multimode resonator (4)；
The third quarter-wave resonance of third port output end quarter-wave coupling line (32) and the second multimode resonator (5)
Device (51) parallel coupling；
First quarter-wave resonance device (41) of first multimode resonator (4) and the second quarter-wave resonance device
(42) it being mutually perpendicular to, the first plane of symmetry minor matters loading unit (43), the second plane of symmetry minor matters loading unit (44) are connected with each other, and
It is distributed respectively with the first quarter-wave resonance device (41), the second quarter-wave resonance device (42) at 45 degree of angles, second
Third quarter-wave resonance device (51), the 4th quarter-wave resonance device (52) of multimode resonator (5) are mutually perpendicular to,
Third plane of symmetry minor matters loading unit (53), the 4th plane of symmetry minor matters loading unit (54) are connected with each other, and respectively with the three or four
/ mono- wave resonator (51), the 4th quarter-wave resonance device (52) are distributed at 45 degree of angles.
2. the bimodulus balun bandpass filter according to claim 1 based on multimode resonator, it is characterised in that: described
Two-port netwerk output end feeder line (2) is identical with the structure size of third port output end feeder line (3), the first multimode resonator (4) and
Second multimode resonator (5) is the multimode resonator of the identical plane of symmetry minor matters load of structure size.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848503B (en) * | 2017-03-24 | 2020-05-29 | 中国振华集团云科电子有限公司 | Thin film filter and method for manufacturing thin film filter |
| CN107256997A (en) * | 2017-06-09 | 2017-10-17 | 南京理工大学 | Ultra wide band balun wave filter based on the line of rabbet joint |
| CN107369899B (en) * | 2017-07-18 | 2023-03-21 | 华南理工大学 | Filtering antenna array based on multi-mode resonator |
| CN113871830A (en) * | 2020-06-30 | 2021-12-31 | 富华科精密工业（深圳）有限公司 | Balun structure and electronic device with same |
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| CN1983712A (en) * | 2005-12-16 | 2007-06-20 | 财团法人工业技术研究院 | Balance to non-balance transducer with filter function |
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