CN105514547A - Low-pass band-pass five-duplex based on novel frequency separation structure - Google Patents
Low-pass band-pass five-duplex based on novel frequency separation structure Download PDFInfo
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The invention discloses a low-pass band-pass five-duplex based on a novel frequency separation structure, which achieves through a microstrip circuit, and comprises a low-pass wave filter (T1) and four different center frequencies of band-pass wave filters (T2,T3,T4 and T5). The low-pass band-pass five-duplex based on the novel frequency separation structure can adjust a transmission zero on a band-pass side of the low-pass wave filter in a certain range by leading in a stepped impedance side line, thereby improving selectivity. The low-pass band-pass five-duplex based on the novel frequency separation structure can generate attenuation poles outside a low-pass wave filter band pass by leading in a defected ground structure, and greatly enlarges a stopband suppression range of a wave filter. The low-pass band-pass five-duplex based on the novel frequency separation structure can conveniently increase the channel number of multiple duplexes by using the novel frequency separation structure, and can control the center frequency of the band-pass channels. The low-pass band-pass five-duplex based on the novel frequency separation structure greatly reduces the effect of mutual interference between various channels by being excellently matched with the network, and enables various ports to have excellent isolation. The low-pass band-pass five-duplex based on the novel frequency separation structure has the advantages that the low-pass band-pass five-duplex based on the novel frequency separation structure is excellent in frequency selectivity, high out-of-band rejection, high isolation, small volume and simple and reliable structure and the like.
Description
Technical field
The present invention relates to the technical field of plane microstrip filter, particularly logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction.
Background technology
In recent years, the development of the communications industry is more and swifter and more violent.Various communication innovative technology is widely used in military or civilian field, and as satellite communication, mobile communication etc., the life for us provides huge facility.Such as, along with the appearance of various communication standard, GSM, CDMA, WCDMA, TD-LTE, WiFi, WiMAX etc., people need to divide more and more and more and more thinner to frequency range.Being on the increase of communications band, also more and more higher to the sensitivity requirement of receiver.Therefore, the signal between each channel how is made not interfere with each other the key technical problem become in Communication System Design.
In a wireless communication system, if be that each frequency range is equipped with a secondary receipts/antenna all separately, Circuits System volume will inevitably be made to become huge, also can mutually disturb between even each antenna.So optimal method is receive-transmit system share common antenna, and combining filter (multiplexer) is adopted to be separated by the signal of different frequency range.Therefore Microwave Multiplexer is as one of important component part in modern wireless communication systems, and its performance quality largely determines the work quality of system.Current available frequency spectrum resource growing tension, therefore requires more and more higher to each subfilter frequency selective characteristic of multiplexer.In order to improve message capacity and avoid the interference between adjacent channel, require that each output port of multiplexer will have high isolation and Out-of-band rejection; In order to improve signal to noise ratio, require will there be low insertion loss in passband; And in order to reduce the distortion of signal, require in passband, have smooth amplitude-frequency characteristic and group delay property; In order to meet Modern communications terminals trend toward miniaturization, require that multiplexer has more small size and weight.
In the multiplexer proposed at present, commonly band leads to-bandpass-type multiplexer, because the matching network simplicity of design of this type multiplexer, easily realizes high isolation between different frequency bands.And comprise the multiplexer of lowpass structures, because matching network design is complicated, uncommon at present.And the logical multiplexer of existing low pass-band only comprises two passages mostly, and be still short of to some extent in performance.
Data is presented at 2002, the people such as Yo-ShenLin deliver and are entitled as " Lumped-ElementCoplanar-WaveguideDiplexer " article in european microwave meeting (EuropeanMicrowaveconference), coplanar waveguide structure is adopted to devise the logical duplexer of low pass-band, but the pass-band performance of duplexer is short of to some extent, this structure as shown in Figure 1.
Data is also presented at 1999, M.H.Capstick delivers and is entitled as " Microstriplowpass-bandpassdiplexertopology " article on " IETELECTRONICSLETTERS ", adopts transmission line structure to devise the logical duplexer of plane low pass-band.Its design key thinking is the centre frequency place transmission zero of low pass filter being arranged on band pass filter passband, and this structure as shown in Figure 2.
Data is presented at again 2012, the people such as Pu-HuaDeng deliver and are entitled as " DesignofMicrostripLowpass-BandpassDiplexer " article on " IEEEMICROWAVEANDWIRELESSCOMPONENTSLETTERS ", describe the method for designing of the logical diplexer matching system of low pass-band based on planar microstrip structure.Duplexer is made up of high low-impedance line low pass filter and coupled resonators band pass filter, and its structure as shown in Figure 3.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art and deficiency, a kind of low pass-band based on novel frequency isolating construction is provided to lead to five multiplexers, the number of active lanes of multiplexer is made to obtain certain expansion, and under compact circuit size, in its frequency selectivity, isolation, band, the performance such as Insertion Loss and Out-of-band rejection increases, multiplexer of the present invention has five passages, therefore be called five multiplexers, wherein, low frequency channel is based on uniform impedance line and the design of stepped impedance line structure, and band circulation passage is based on coupled resonators structural design.
Object of the present invention is achieved through the following technical solutions:
A kind of low pass-band based on novel frequency isolating construction leads to five multiplexers, be produced on medium substrate 1 in the manner of a printed circuit board, the same face of described medium substrate 1 is manufactured with respectively the input feeder line head port1 for inputting electromagnetic wave signal, low pass filter T1 and its for exporting the output feeder line head port2 of electromagnetic wave signal, be operated in the first band pass filter T2 of frequency range 1 and it is for exporting the output feeder line head port3 of electromagnetic wave signal, be operated in the second band pass filter T3 of frequency range 2 and it is for exporting the output feeder line head port4 of electromagnetic wave signal, be operated in the 3rd band pass filter T4 of frequency range 3 and it is for exporting the output feeder line head port5 of electromagnetic wave signal, be operated in the 4th band pass filter T5 of frequency range 4 and it is for exporting the output feeder line head port6 of electromagnetic wave signal, transmission line 34, 35, the another side of this medium substrate is ground plate,
The first end of described transmission line 34 is connected with described input feeder line head port1, and its second end is connected with the input of described low pass filter T1; The first end of described transmission line 35 is connected with described output feeder line head port2, and its second end is connected with described low pass filter T1; Described first band pass filter T2 and the 3rd band pass filter T4 is positioned at the side of described transmission line 34, and described second band pass filter T3 and the 4th band pass filter T5 is positioned at the opposite side of described transmission line 34;
The input of described low pass filter T1 is parallel with four sections of open circuit minor matters 2,3,4,5, and the electrical length of above-mentioned four sections of minor matters lines is set to first, second, third and fourth quarter-wave corresponding to band pass filter centre frequency described successively respectively.
Further, the electrical length that first, second, third and fourth band pass filter described is placed on distance low pass filter T1 input is respectively respectively the quarter-wave strong point corresponding to band pass filter its center frequency.
Further, described low pass filter T1 comprises first and second open circuit Stepped Impedance minor matters, an open-circuit Low ESR minor matters 9a, 9b, high impedance connecting line 6;
Described transmission line 34 is that the incoming feeder of described low pass filter T1 is connected with described input feeder line head port1, and described transmission line 35 is that the output feeder of described low pass filter T1 is connected with described output feeder line head port2;
Described first and second open circuit Stepped Impedance minor matters and described open circuit Low ESR minor matters 9a, 9b symmetrical centered by described high impedance connecting line 6;
Wherein said first open circuit Stepped Impedance minor matters are formed by connecting by transmission line 7a, 8a of two sections of uneven impedances, described second open circuit Stepped Impedance minor matters are formed by connecting by transmission line 7b, 8b of two sections of uneven impedances, meanwhile, described transmission line 7a is connected with described transmission line 7b straight line.
Further, the ground plane of the medium substrate 1 between described transmission line 8a and described transmission line 8b is provided with four notching constructions 10,11,12,13, above-mentioned notching construction is symmetrical centered by described high impedance connecting line 6.
Further, described first band pass filter T2 comprises quarter-wave short circuit uniform impedance resonator 14,16, half-wavelength open circuit step electric impedance resonator 15, as the transmission line 36 of output feeder, wherein said resonator 14,16 is L-type, described resonator 15 is U-shaped, and its resonance frequency is the centre frequency of described first band pass filter T2, and described resonator 15 is between described resonator 14,16.
Further, described second band pass filter T3 comprises quarter-wave short circuit uniform impedance resonator 19,21, half-wavelength open circuit step electric impedance resonator 20, as the transmission line 37 of output feeder, wherein said resonator 19,21 is L-type, described resonator 20 is U-shaped, and its resonance frequency is the centre frequency of described second band pass filter T3, and described resonator 20 is between described resonator 19,21.
Further, described 3rd band pass filter T4 comprises quarter-wave short circuit uniform impedance resonator 24,26, half-wavelength open circuit step electric impedance resonator 25, as the transmission line 38 of output feeder, wherein said resonator 24,26 is L-type, described resonator 25 is U-shaped, and its resonance frequency is the centre frequency of described 3rd band pass filter T4, and described resonator 25 is between described resonator 24,26.
Further, described 4th band pass filter T5 comprises quarter-wave short circuit uniform impedance resonator 29,31, half-wavelength open circuit step electric impedance resonator 30, as the transmission line 39 of output feeder, wherein said resonator 29,31 is L-type, described resonator 30 is U-shaped, and its resonance frequency is the centre frequency of described 4th band pass filter T5, and described resonator 30 is between described resonator 29,31.
Further, described first band pass filter T2 is by described transmission line 34 feed, and its feed end A' is quarter-wave corresponding to described first band pass filter T2 centre frequency apart from the length of the input feedback point E of described low pass filter T1;
Described second band pass filter T3 is by described transmission line 34 feed, and its feed end B' is quarter-wave corresponding to described second band pass filter T3 centre frequency apart from the length of the input feedback point E of described low pass filter T1;
Described 3rd band pass filter T4 is by described transmission line 34 feed, and its feed end C' is quarter-wave corresponding to described 3rd band pass filter T4 centre frequency apart from the length of the input feedback point E of described low pass filter T1;
Described 4th band pass filter T5 is by described transmission line 34 feed, and its feed end D' is quarter-wave corresponding to described 4th band pass filter T5 centre frequency apart from the length of the input feedback point E of described low pass filter T1.
Further, described first band pass filter T2, described second band pass filter T3, described 3rd band pass filter T4, described 4th band pass filter T5 and described low pass filter T1 input feed or export feed and adopt tap feed or couple feed.
Further, each transmission line adopts microstrip line, and is the form of straight line or broken line.
The present invention has following advantage and effect relative to prior art:
1, stepped impedance minor matters introduced by low pass filter, and the position of the transmission zero that passband side is produced by these minor matters can control flexibly by regulating impedance ratio, thus improves the frequency selectivity of low frequency channel;
2, by introducing defect ground structure, introduce attenuation pole outward at low pass filter band, thus improve stopband suppression, widen stopband range, for the design of follow-up multiplexer brings very large benefit;
3, introduce the frequency separation structure of novel structure, under the basis keeping low pass filter performance constant, can increase port number more, and make the centre frequency of band circulation passage controlled, each interchannel isolation is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of lamped element co-planar waveguide duplexer in prior art;
Fig. 2 is the structural representation of the logical duplexer of a kind of low pass-band in prior art;
Fig. 3 is the structural representation of the logical duplexer of another kind of low pass-band in prior art;
Fig. 4 is the structural representation of logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction disclosed in the present embodiment;
Fig. 5 (a) is the low pass filter microstrip structure of five multiplexers disclosed in the present embodiment;
Fig. 5 (b) is the low pass filter lumped parameter equivalent circuit of five multiplexers disclosed in the present embodiment;
Fig. 6 is the scattering parameter simulation result figure of logical five multiplexers of the low pass-band of plane disclosed in the present embodiment.
Embodiment
For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment
Multiplexer is that a kind of Neng Ba mono-road signal is divided into the different multiple signals of frequency, or the radio-frequency devices of signal syntheses one road signals different for channelized frequencies.It operates mainly in communication system radio-frequency front-end, for separating of or synthesis characteristic frequency signal process, the interference signal of other frequencies of filtering.In some mixing communication systems, usually need to be separated intermediate frequency and local frequency, the multiplexer therefore with low frequency channel has important Research Significance.The current research for the logical multiplexer of planar microstrip low pass-band is also very few, the difficult point of research is to realize a wide band open-circuit condition, within the scope of the cut-off frequency of about low pass filter, namely ensure from zero frequency that band circulation passage is for the approximate open circuit of low frequency channel.In other words, will design good frequency separation network exactly, each path filter is mated good, each channel works independently and is not subject to other channel disturbance.Under the performance such as little, easy of integration in guarantee size, frequency selectivity is high, isolation is high and loss is little, Chinese scholars has proposed the structure of the logical multiplexer of some low pass-bands, and achieve effective achievement to a certain extent, and present design has outstanding performance in the requirement of the logical multiplexer of above low pass-band, and achieve the isolation of more frequency channel and Geng Gao under compact circuit size, overall performance is satisfactory.
Refer to Fig. 4, Fig. 4 is the structural representation of logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction disclosed in the present embodiment.A kind of low pass-band based on novel frequency isolating construction shown in Fig. 4 leads to five multiplexers, be produced on medium substrate 1 in the manner of a printed circuit board, the same face of described medium substrate 1 is manufactured with respectively the input feeder line head port1 for inputting electromagnetic wave signal, low pass filter T1 and its for exporting the output feeder line head port2 of electromagnetic wave signal, be operated in the first band pass filter T2 of frequency range 1 and it is for exporting the output feeder line head port3 of electromagnetic wave signal, be operated in the second band pass filter T3 of frequency range 2 and it is for exporting the output feeder line head port4 of electromagnetic wave signal, be operated in the 3rd band pass filter T4 of frequency range 3 and it is for exporting the output feeder line head port5 of electromagnetic wave signal, be operated in the 4th band pass filter T5 of frequency range 4 and it is for exporting the output feeder line head port6 of electromagnetic wave signal, transmission line 34, 35, the another side of this medium substrate is ground plate,
The first end of described transmission line 34 is connected with described input feeder line head port1, and its second end is connected with the input of described low pass filter T1; The first end of described transmission line 35 is connected with described output feeder line head port2, and its second end is connected with described low pass filter T1; Described first band pass filter T2 and the 3rd band pass filter T4 is positioned at the side of described transmission line 34, and described second band pass filter T3 and the 4th band pass filter T5 is positioned at the opposite side of described transmission line 34;
As shown in Figure 4, the input of low pass filter T1 is parallel with four sections of open circuit minor matters 2,3,4,5, and the electrical length of above-mentioned four sections of minor matters lines is set to first, second, third and fourth quarter-wave corresponding to band pass filter centre frequency described successively respectively.
Low pass filter T1 comprises first and second open circuit Stepped Impedance minor matters, an open-circuit Low ESR minor matters 9a, 9b, high impedance connecting line 6; Transmission line 34 is that the incoming feeder of low pass filter T1 is connected with input feeder line head port1, and transmission line 35 is that the output feeder of described low pass filter T1 is connected with output feeder line head port2;
Wherein, first and second open circuit Stepped Impedance minor matters and open circuit Low ESR minor matters 9a, 9b symmetrical centered by high impedance connecting line 6;
First open circuit Stepped Impedance minor matters are formed by connecting by transmission line 7a, 8a of two sections of uneven impedances, and the second open circuit Stepped Impedance minor matters are connect by transmission line 7b, 8b of two sections of uneven impedances and form, and meanwhile, transmission line 7a is connected with transmission line 7b straight line.Compare than conventional uniform impedance stub structure, a transmission zero can be given birth to by fecund, thus improve the band external characteristic of low pass filter.First and second open circuit Stepped Impedance minor matters are equivalent to shunt capacitance, open circuit Low ESR minor matters 9a, 9b are equivalent to shunt capacitance, high impedance connecting line 6 is equivalent to series inductance, and low pass filter microstrip structure and lumped parameter equivalent circuit thereof are respectively as shown in Fig. 5 (a), (b).
The ground plane of the medium substrate 1 between above-mentioned transmission line 8a and transmission line 8b is provided with four notching constructions 10,11,12,13, above-mentioned notching construction is symmetrical centered by high impedance connecting line (6).10,11,12,13 is the notching construction on ground plate, i.e. defect ground structure, and effect introduces attenuation pole outward at low pass filter band thus widen stopband to suppress.
The frequency separation structure of five multiplexers disclosed by the invention is realized by minor matters line 2,3,4,5 of opening a way, and they have two aspect effects: being equivalent to shunt capacitance on the one hand, going to meet Fig. 5 (b) lumped capacity C by designing suitable characteristic impedance
1value, on the other hand they are being with mid-band frequency f all for match circuit
0place provides short circuit condition.Specifically the electrical length of four sections of minor matters lines is set to respectively first, second, third and fourth band pass filter channel central frequency (suppose to be respectively f
01, f
02, f
03, f
04) corresponding to four/wavelength, as shown in Figure 4, A point is open circuit point, is frequency f through electrical length
01corresponding four/wavelength minor matters line 2 is to E point, and E point is for f
01short circuit, then through electrical length be frequency f
01four corresponding/wavelength transmission line is to A ' point, and A ' is for frequency f
01open circuit.Like this, turn right look from A ' point, the input impedance of low pass filter is infinitely great, so be f when signal is operated in centre frequency
01during passage, the load effect produced by low frequency channel can be similar to be ignored.In like manner, B point, C point, D point are open circuit point, are frequency f respectively through electrical length
02, f
03, f
04corresponding four/wavelength minor matters line 3,4,5 is to E point, and E point is for f
02, f
03, f
04equal short circuit, then be frequency f respectively through electrical length
02, f
03, f
04four corresponding/wavelength transmission line is to B ' point, C ' point, D ' point, and B ' point, C ' point, D ' point is respectively for frequency f
02, f
03, f
04open circuit, so turn right look from B ' point, C ' point, D ' point, the input impedance of low pass filter is infinity, is f when signal is operated in centre frequency
02, f
03, f
04during passage, the load effect produced by low frequency channel all can be similar to be ignored.So each interchannel can independent design, works alone, and the situation that there will not be interchannel mutually to disturb.
Known from accompanying drawing 4, first band pass filter T2 comprise quarter-wave short circuit uniform impedance resonator 14,16, half-wavelength open circuit step electric impedance resonator 15, transmission line 36 for output feeder, wherein transmission line 36 is linear pattern, resonator 14,16 is L-type, its resonator length is quarter-wave corresponding to described first band pass filter T2 centre frequency, one end is open circuit, and the other end is respectively by earth point 17,18 ground connection; Resonator 15 is U-shaped, two ends are open circuit, its resonance frequency is the centre frequency of the first band pass filter T2, its resonator length be 1/2nd wavelength corresponding to described first band pass filter T2 centre frequency and resonator 15 between resonator 14,16.
Second band pass filter T3 comprise quarter-wave short circuit uniform impedance resonator 19,21, half-wavelength open circuit step electric impedance resonator 20, transmission line 37 for output feeder, wherein transmission line 37 is linear pattern, resonator 19,21 is L-type, its resonator length is quarter-wave corresponding to described second band pass filter T3 centre frequency, one end is open circuit, and the other end is respectively by earth point 22,23 ground connection; Resonator 20 is U-shaped, two ends are open circuit, its resonance frequency is the centre frequency of the second band pass filter T3, its resonator length be 1/2nd wavelength corresponding to described second band pass filter T3 centre frequency and resonator 20 between resonator 19,21.
3rd band pass filter T4 comprise quarter-wave short circuit uniform impedance resonator 24,26, half-wavelength open circuit step electric impedance resonator 25, transmission line 38 for output feeder, wherein transmission line 38 and resonator 24,26 are L-type, its resonator length is quarter-wave corresponding to described 3rd band pass filter T4 centre frequency, one end is open circuit, and the other end is respectively by earth point 27,28 ground connection; Resonator 25 is U-shaped, two ends are open circuit, its resonance frequency is the centre frequency of the 3rd band pass filter T4, its resonator length be 1/2nd wavelength corresponding to described 3rd band pass filter T4 centre frequency and resonator 25 between resonator 24,26.
4th band pass filter T5 comprise quarter-wave short circuit uniform impedance resonator 29,31, half-wavelength open circuit step electric impedance resonator 30, transmission line 39 for output feeder, wherein transmission line 39 and resonator 29,31 are L-type, its resonator length is quarter-wave corresponding to described 4th band pass filter T5 centre frequency, one end is open circuit, and the other end is respectively by earth point 32,33 ground connection; Resonator 30 is U-shaped, two ends are open circuit, its resonance frequency is the centre frequency of the 4th band pass filter T5, its resonator length be 1/2nd wavelength corresponding to described 4th band pass filter T5 centre frequency and resonator 30 between resonator 29,31.
Input feed or the output feed of above-mentioned first band pass filter T2, the second band pass filter T3, the 3rd band pass filter T4, the 4th band pass filter T5 and low pass filter T1 adopt tap feed or couple feed.Above-mentioned each transmission line adopts microstrip line simultaneously, and is the form of straight line or broken line.
Port1 is used for input space electromagnetic wave signal, and Port2, Port3, Port4, Port5, Port6 are for exporting the useful signal of the particular frequency range after five path filters are selected, and all input/output ports are the matched impedance of 50 ohm.34 for connecting the incoming feeder of Port1, and 35,36,37,38,39 are respectively the output feeder connecting Port2, Port3, Port4, Port5, Port6.
Three-dimensional artificial software ZELANDIE3D is used to emulate filter, five multiplexer devices of the present invention's design use the relative dielectric constant of micro-belt substrate to be 2.55, medium level is 0.80mm, the low pass filter cutoff frequency of design is 1GHz, and the centre frequency of band pass filter is respectively 2.4GHz, 3.5GHz, 4.6GHz and 5.8GHz.
Fig. 6 shows the scattering parameter simulation result of logical five multiplexers of plane low pass-band, and frequency range is 0 to 8GHz.Transverse axis represents the frequency input signal of band pass filter of the present invention, and the longitudinal axis represents log-magnitude (dB).Insertion loss S is given in figure
21, S
31, S
41, S
51, S
61with return loss S
11amplitude-frequency response.S
m1(m=2,3,4,5,6) represent that its corresponding mathematical function is: 10*lg (P by the relation between the input power of five multiplexer signals of the present invention and the power output of each channel signal
i/ P
om) (dB)=20*lg|S
m1|, wherein, P
irepresent input power, P
omrepresent the power output of port m.In the signals transmission of band pass filter of the present invention, the Partial Power of signal is reflected back toward signal source, is become reflection power by the power reflected.S
11represent the relation between the input power of the signal of band pass filter in the present invention and the reflection power of signal, its corresponding mathematical function is: 10*lg (P
r/ P
i) (dB)=20*lg|S
11|, wherein, P
rrepresent reflection power, P
irepresent incident power.
As shown in Figure 6, low frequency channel cut-off frequency is 1GHz, and insertion loss absolute value is less than 0.6dB, and return loss absolute value is greater than 15.5dB.From 0 to 8GHz, there is the stopband of below-20dB to suppress, be with outer performance satisfactory.Other four band circulation passage centre frequencies are respectively 2.4GHz, 3.5GHz, 4.6GHz and 5.8GHz, minimum insertion loss is respectively 1.23dB, 1.74dB, 2.28dB and 2.95dB, and return loss absolute value is greater than 18dB, 17.2dB, 17.5dB and 15.7dB respectively.
In sum, disclosed in the present embodiment, a kind of plane low pass-band realized with microstrip circuit leads to five multiplexers, and it is that the low pass filter of 1GHz and four centre frequencies are respectively 2.4GHz, 3.5GHz, 4.6GHz and 5.8GHz band pass filter and form by a cut-off frequency.By introducing stepped impedance minor matters line, the transmission zero of pass band side can be made adjusted within the specific limits, thus improve selectivity.Can produce attenuation pole outside low pass filter band is logical by introducing defect ground structure, the stopband greatly having widened filter suppresses scope.By using novel frequency isolating construction, the number of active lanes of multiplexer can be increased easily, and centre frequency with circulation passage is controlled.Good matching network greatly reduces the impact that each interchannel disturbs mutually, makes each port of five multiplexers have good isolation.There is the advantages such as frequency selectivity is good, Out-of-band rejection is high, isolation is high, volume is little, simple and reliable for structure.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1., based on logical five multiplexers of low pass-band of novel frequency isolating construction, be produced in the manner of a printed circuit board on medium substrate (1), it is characterized in that:
The same face of described medium substrate (1) is manufactured with respectively the input feeder line head port1 for inputting electromagnetic wave signal, low pass filter (T1) and it is for exporting the output feeder line head port2 of electromagnetic wave signal, be operated in first band pass filter (T2) of frequency range 1 and it is for exporting the output feeder line head port3 of electromagnetic wave signal, be operated in second band pass filter (T3) of frequency range 2 and it is for exporting the output feeder line head port4 of electromagnetic wave signal, be operated in the 3rd band pass filter (T4) of frequency range 3 and it is for exporting the output feeder line head port5 of electromagnetic wave signal, be operated in the 4th band pass filter (T5) of frequency range 4 and it is for exporting the output feeder line head port6 of electromagnetic wave signal, transmission line (34, 35), the another side of this medium substrate is ground plate,
The first end of described transmission line (34) is connected with described input feeder line head port1, and its second end is connected with the input of described low pass filter (T1); The first end of described transmission line (35) is connected with described output feeder line head port2, and its second end is connected with described low pass filter (T1); Described first band pass filter (T2) and the 3rd band pass filter (T4) are positioned at the side of described transmission line (34), and described second band pass filter (T3) and the 4th band pass filter (T5) are positioned at the opposite side of described transmission line (34);
The input of described low pass filter (T1) is parallel with four sections of open circuit minor matters (2,3,, and the electrical length of above-mentioned four sections of minor matters lines is set to first, second, third and fourth quarter-wave corresponding to band pass filter centre frequency described successively respectively 4,5).
2. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 1, is characterized in that,
The electrical length that first, second, third and fourth band pass filter described is placed on distance low pass filter (T1) input is respectively respectively quarter-wave strong point corresponding to band pass filter its center frequency.
3. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 1, is characterized in that,
Described low pass filter (T1) comprises first and second open circuit Stepped Impedance minor matters, open-circuit Low ESR minor matters (9a, 9b), high impedance connecting line (6);
The incoming feeder that described transmission line (34) is described low pass filter (T1) is connected with described input feeder line head port1, and the output feeder that described transmission line (35) is described low pass filter (T1) is connected with described output feeder line head port2;
Described first and second open circuit Stepped Impedance minor matters and described open circuit Low ESR minor matters (9a, 9b) symmetrical centered by described high impedance connecting line (6);
Wherein said first open circuit Stepped Impedance minor matters are by the transmission line (7a of two sections of uneven impedances, 8a) be formed by connecting, described second open circuit Stepped Impedance minor matters are by the transmission line (7b of two sections of uneven impedances, 8b) be formed by connecting, meanwhile, described transmission line (7a) is connected with described transmission line (7b) straight line.
4. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 2, is characterized in that,
The ground plane of the medium substrate (1) between described transmission line (8a) and described transmission line (8b) is provided with four notching constructions (10,11,12,13), above-mentioned notching construction is symmetrical centered by described high impedance connecting line (6).
5. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 1, is characterized in that,
Described first band pass filter (T2) comprises quarter-wave short circuit uniform impedance resonator (14,16), half-wavelength open circuit step electric impedance resonator (15), transmission line (36) as output feeder, wherein said resonator (14,16) be L-type, described resonator (15) is for U-shaped, its resonance frequency is the centre frequency of described first band pass filter (T2), and described resonator (15) is positioned between described resonator (14,16).
6. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 1, is characterized in that,
Described second band pass filter (T3) comprises quarter-wave short circuit uniform impedance resonator (19,21), half-wavelength open circuit step electric impedance resonator (20), transmission line (37) as output feeder, wherein said resonator (19,21) be L-type, described resonator (20) is for U-shaped, its resonance frequency is the centre frequency of described second band pass filter (T3), and described resonator (20) is positioned between described resonator (19,21).
7. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 1, is characterized in that,
Described 3rd band pass filter (T4) comprises quarter-wave short circuit uniform impedance resonator (24,26), half-wavelength open circuit step electric impedance resonator (25), transmission line (38) as output feeder, wherein said resonator (24,26) be L-type, described resonator (25) is for U-shaped, its resonance frequency is the centre frequency of described 3rd band pass filter (T4), and described resonator (25) is positioned between described resonator (24,26).
8. logical five multiplexers of a kind of low pass-band based on novel frequency isolating construction according to claim 1, is characterized in that,
Described 4th band pass filter (T5) comprises quarter-wave short circuit uniform impedance resonator (29,31), half-wavelength open circuit step electric impedance resonator (30), transmission line (39) as output feeder, wherein said resonator (29,31) be L-type, described resonator (30) is for U-shaped, its resonance frequency is the centre frequency of described 4th band pass filter (T5), and described resonator (30) is positioned between described resonator (29,31).
9., according to logical five multiplexers of the arbitrary described a kind of low pass-band based on novel frequency isolating construction of claim 1 to 8, it is characterized in that,
Described first band pass filter (T2) is by described transmission line (34) feed, and its feed end (A') is quarter-wave corresponding to described first band pass filter (T2) centre frequency apart from the length of input feedback point (E) of described low pass filter (T1);
Described second band pass filter (T3) is by described transmission line (34) feed, and its feed end (B') is quarter-wave corresponding to described second band pass filter (T3) centre frequency apart from the length of input feedback point (E) of described low pass filter (T1);
Described 3rd band pass filter (T4) is by described transmission line (34) feed, and its feed end (C') is quarter-wave corresponding to described 3rd band pass filter (T4) centre frequency apart from the length of input feedback point (E) of described low pass filter (T1);
Described 4th band pass filter (T5) is by described transmission line (34) feed, and its feed end (D') is quarter-wave corresponding to described 4th band pass filter (T5) centre frequency apart from the length of input feedback point (E) of described low pass filter (T1).
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