EP0432729B1 - Radio frequency signal combining/sorting apparatus - Google Patents

Radio frequency signal combining/sorting apparatus Download PDF

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Publication number
EP0432729B1
EP0432729B1 EP19900123813 EP90123813A EP0432729B1 EP 0432729 B1 EP0432729 B1 EP 0432729B1 EP 19900123813 EP19900123813 EP 19900123813 EP 90123813 A EP90123813 A EP 90123813A EP 0432729 B1 EP0432729 B1 EP 0432729B1
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EP
European Patent Office
Prior art keywords
channel
channel filters
combining
sorting apparatus
radio frequency
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.)
Expired - Lifetime
Application number
EP19900123813
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German (de)
English (en)
French (fr)
Other versions
EP0432729A3 (en
EP0432729A2 (en
Inventor
Toshio Nishikawa
Youhei Ishikawa
Koichi Takehara
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP1325536A external-priority patent/JPH0828603B2/ja
Priority claimed from JP1331611A external-priority patent/JPH0828604B2/ja
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP0432729A2 publication Critical patent/EP0432729A2/en
Publication of EP0432729A3 publication Critical patent/EP0432729A3/en
Application granted granted Critical
Publication of EP0432729B1 publication Critical patent/EP0432729B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators
    • H01P7/105—Multimode resonators
    • 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
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters

Definitions

  • the present invention generally relates to communication equipment and more particularly, to a radio frequency signal combining/sorting apparatus which composes a plurality of transmission signals for transmission to a common output line or antenna.
  • the antenna sharing technique at the base station is essential from the economical point of view, and development of an efficient radio frequency signal combining/sorting apparatus for composing many input signals into one output signal has been strongly demanded.
  • the radio frequency signal combining/sorting apparatus is not limited in its application, only to the antenna sharing device as referred to above, but may also be applied generally to a power combining device having a construction as shown in Fig. 15 or 16.
  • the known power combining device PA includes so-called 3dB hybrid circuits H1,H2 and H3 connected to each other and respectively grounded through resistors R1,R2 and R3 for dummy loads, input terminals IN1 and IN2 for the 3dB hybrid circuit H1, input terminals IN3 and IN4 for the 3dB hybrid circuit H2, and an output terminal OUT led out from the 3dB hybrid circuit H3.
  • the 3dB hybrid circuit H1 combines the power of the signals inputted from the input terminals IN1 and IN2 for application to one input of the 3dB hybrid circuit H3, while the 3dB hybrid circuit H2 combines the power of the signals inputted from the input terminals IN3 and IN4 so as to be applied to the other input of said 3dB hybrid circuit H3.
  • the 3dB hybrid circuit H3 subjects both signals thus inputted to power combination for output thereof.
  • the known power combining device PB in Fig. 16 includes input terminals IN1,IN2, --- and INn respectively coupled to channel filters F1,F2, --- and Fn each constituted by a band-pass filter, through isolators I1,I2,--- and In, a power combining circuit (or junction unit) JU coupled with said channel filters F1,F2,--- and Fn, and an output terminal OUT led out from the circuit JU.
  • the so-called 3dB hybrid combining system shown in Fig. 15 is of a simplified system without frequency characteristics in principle, since half of the power is absorbed by dummy loads each time the power passes through the 3dB hybrid circuit, it is not generally used as the signal combining/sorting apparatus for effecting power transmission.
  • junction unit combining system shown in Fig. 16 through employment of the channel filters for passing band region of the predetermined channels, by inputting signals of the corresponding channels, the power composition may be effected at a small sharing loss, and therefore, the system is generally employed as the radio frequency signal combining/sorting apparatus.
  • an essential object of the present invention is to provide a radio frequency signal combining/sorting apparatus which is so arranged to employ channel filters not provided with very high Q value and frequency temperature stability, and yet, to be applicable to a system having many channels, with small channel intervals.
  • Another object of the present invention is to provide a radio frequency signal combining/sorting apparatus of the above described type in which resonators used therein as channel filters are further reduced in size so as to achieve compact size, low loss and cost reduction of the apparatus on the whole including composite parts.
  • a radio frequency signal combining/sorting apparatus which includes a plurality of channel filters which allow band regions of respective transmission channels to pass therethrough, isolators connected to respective inputs of said channel filters, a plurality of sets of power comparing circuits including branch lines for composing outputs of said channel filters as one output, and hybrid circuits arranged to compose outputs per two sets of said power composing circuits.
  • the band regions of said respective channel filters are selected in such relation as the band regions of the respective channel filters of the same power composing circuit being spaced from each other to a largest extent.
  • the band regions of the respective channel filters connected to one power composing circuit are allocated in every other channel alternately. Therefore, the channel interval of the respective signals inputted to the one power composing circuit is doubled for enlarging, thereby to reduce interference with respect to the neighboring channels. Therefore, requirements for the Q value and frequency temperature stability to the respective channel filters are alleviated. On the contrary, even in the case where channel filters provided with the same Q value and frequency temperature stability are employed, it becomes possible to apply the apparatus to a system in which a larger number of channels are set at small channel intervals.
  • a radio frequency signal combining/sorting apparatus which includes a channel filter unit formed with signal input coupling means receiving holes and signal output coupling means receiving holes, and provided with a plurality of TM mode dielectric resonators respectively adapted to allow band regions of specific channels to pass therethrough.
  • the dielectric resonators are arranged on the same plane at least as said signal output coupling means receiving holes, and a junction unit having a circuit board in which the signal output coupling means project from the surface thereof, and on which branched lines including transmission lines for composing outputs of said signal output coupling means are provided.
  • the junction unit is combined with said channel filter unit to constitute said radio frequency signal combining/sorting apparatus.
  • the radio frequency signal combining/sorting apparatus in the above embodiment of the present invention is broadly divided into the channel filter unit and the junction unit each having constructions as described above, which are combined with each other to provide one radio frequency signal combining/sorting apparatus.
  • the channel filter unit may be compact in size and low in the insertion loss.
  • the signal output coupling means to be coupled with the outputs of the respective dielectric resonators of the channel filter unit is integrally formed with the junction unit, by combining the junction unit into one unit with the channel filter unit, a radio frequency signal combining/sorting apparatus still more reduced in size on the whole may be constituted.
  • the invention is defined in claim 1.
  • Fig. 1 a schematic circuit diagram representing general construction in principle, of a radio frequency signal combining/sorting apparatus G1 according to the present invention, which generally includes channel filters F1,F3, --- and Fn-1, and F2,F4, --- and Fn which respectively allow band regions of allocated transmission channels to pass therethrough, isolators I1,I3, --- and In-1, and I2,I4, --- and In connected to inputs of the respective channel filters, a power composing circuit JU1 (Junction unit) connected to outputs of the channel filters F1,F3, --- and Fn-1 and constituted by branch lines for composing the respective outputs as one output, another power composing circuit JU2 (Junction unit) connected to outputs of the channel filters F2,F4, --- and Fn and constituted by other branch lines, a 3dB hybrid circuit H connected to outputs of said power composing circuits JU1 and JU2 and grounded through a resistor or dummy load R.
  • JU1 power composing circuit JU1
  • JU2
  • the signals inputted from the input terminals IN1,IN3, --- and INn-1 are filtered by the channel filters F1,F3, --- and Fn-1 independently of the signals inputted from the input terminals IN2,IN4, --- and In so as to be composed as one output by the power composing circuit JU1.
  • the signals inputted from the input terminals In2,In4, --- and INn are filtered by the channel filters F2,F4, --- and Fn independently of the signals inputted from the input terminals In1, IN3, --- and INn-1, so as to be composed as one output by the power composing circuit JU2.
  • these two outputs are composed as one output by the 3dB hybrid circuit H.
  • Fig. 2 shows transmission characteristics of the channel filters F1 to F6 in the channel filters F1 to Fn.
  • f1 to f6 correspond to resonance frequencies of the channel filters F1 to F6, and the transmission characteristics of the channel filters at the side connected to the power composing circuit JU1 are shown in the upper stage, with those of the filters at the side connected to the power composing circuits JU2 are given in the lower stage.
  • the band regions of the respective channel filters connected to one power composing circuit are alternately allocated to every other channel. Therefore, the interval between the respective signals inputted to one power composing circuit is doubled for enlarging, thereby to reduce interference with respect to the neighboring channels. Accordingly, requirements of Q value and frequency temperature stability for the respective channel filters may be alleviated. Conversely, even in the case where channel filters provided with the same Q value and frequency temperature stability are employed, they can be applied to a system in which more channels are set through a narrow channel interval.
  • Figs. 3 to 8(C) show constructions of a radio frequency signal combining/sorting apparatus according to one preferred embodiment of the present invention
  • Fig. 3 is a perspective exploded view of the radio frequency signal combining/sorting apparatus G1, with its channel filter unit and junction unit shown as separated from each other
  • Fig. 4 is a perspective view of the combining/sorting apparatus G1 of Fig. 3, with its channel filter unit and junction unit combined with each other to constitute apparatus.
  • the radio frequency signal combining/sorting apparatus G1 generally includes a channel filter unit 100 and a junction unit 101 shown as separated from each other for clarity.
  • the channel filter unit 100 further includes a metallic case 1 of a rectangular cubic box-like configuration open as its upper portion and eight TM mode dielectric resonators F1 to F8 accommodated in said case 1.
  • Each of these dielectric resonators F1 to F8 is constituted by a cavity of a metallized ceramic material of a hexahedron configuration and a dielectric member in a square pillar shape provided in said cavity as will be described in more detail later.
  • On the upper surfaces of the respective dielectric resonators F1 to F8 in Fig. 3 there are formed signal input coupler inserting holes Hi and signal output coupler inserting holes Ho.
  • threaded holes 2 to 13 are formed to receive screws for fixing the junction unit 101.
  • the junction unit 101 shown in Fig. 3 is mainly constituted by two substrates 15 and 16 of ceramic material, branch lines formed between said two substrates, signal input coupling means, signal output coupling means, and input and output connectors to be mentioned hereinbelow.
  • the ceramic substrates 15 and 16 are mounted with eight signal input connectors IN1 to IN8 and one signal output connector indicated by OUT on the upper surface thereto.
  • holes 22 to 33 are formed in positions corresponding to the threaded holes 2 to 13 for fixing the junction unit 101 onto the channel filter unit 100 by screws (not shown).
  • the channel filter unit 100 and the junction unit 101 are combined as shown in Fig. 4, thereby to constitute the eight channel radio frequency signal combining/sorting apparatus G1.
  • the dielectric resonator represented as F includes a square ceramic member 50 in a square box-like configuration open at opposite sides, and metallized on the outer sides thereof, with a square pillar-like inner dielectric member 51 being integrally formed with a bottom 50a of the ceramic member 50, and ceramic side plates 53 and 55 metallized in inner faces thereof facing the open sides of the ceramic member 50.
  • the dielectric resonator having a ceramic cavity is constituted.
  • the holes Hi and Ho for receiving the signal input coupling means and signal output coupling means are formed on the upper surface of the ceramic member 50.
  • Fig. 6 showing the cross section of the one dielectric resonator F of Fig. 5 after assembly, there is formed the shielded cavity by an electrode layer 52 formed on the outer side of the ceramic member 50, and electrodes 54 and 56 formed in the inner faces of the ceramic side plates 53 and 55, and by the functions of said cavity and the inner dielectric member 51, the resonator functions as a TM110 mode dielectric resonator.
  • junction unit 101 construction of the junction unit 101 will be described with reference to Figs. 7 to 8(C).
  • Fig. 7 represents the branch lines formed over the upper surface of the ceramic substrate 15 and particularly made of transmission lines.
  • a so-called tri-plate type transmission line is indicated by Numeral 45.
  • Figs. 8(A), 8(B) and 8(C) respectively show fragmentary cross sections taken along the lines 8A-8A, 8B-8B, and 8(C) and 8(C) in Fig. 7.
  • the ceramic substrate 15 is constituted by forming electrode layers 41 over upper and under surfaces of a ceramic plate 40, while the other ceramic substrate 16 is also composed by forming electrode layers 43 over upper and under surfaces of a ceramic plate 42.
  • a groove g is formed, along which groove, a dielectric member 44 is provided, with an electrode 45 further formed on the dielectric member 44 as shown.
  • This electrode 45 constitutes the tri-plate type transmission line together with the electrode 41 of the ceramic substrate 15, and the electrode 43 of the ceramic substrate 16.
  • FIG. 8(B) shows the cross section at the portion where the signal output coupling means is provided (the cross section along the line 8B-8B in Fig. 7).
  • a through-hole 15a is formed at a predetermined portion of the ceramic substrate 15, and a coupling probe (i.e. signal output coupling means) 17 is extended through the dielectric member 44 and the electrode layer 45, with the end portion of the probe 17 projecting from the undersurface of the ceramic substrate 15 via the through-hole 15a.
  • Fig. 8(C) shows the cross section at the portion of the output connector (taken along the line 8C-8C in Fig. 7). At this portion, an opening is formed in the ceramic substrate 16, and the output connector OUT is mounted on the upper surface of the ceramic substrate 16, with a central conductor 18 of said connector being connected to the electrode 45 as illustrated.
  • through-holes are formed in the ceramic substrates 15 and 16, and central conductors of the respective input connectors extend through the under surface of the substrate 15 as the signal input coupling means such as the coupling probes, coupling loops, etc.
  • the coupling probes 17 projecting from the undersurface of the junction unit 101 are inserted into the signal output coupling means insertion holes of the respective dielectric resonators, while the central conductors of the respective signal input connectors are to be inserted into the signal input coupling means insertion holes of the respective dielectric resonators. Accordingly, the signals for the respective channels inputted from the signal input connectors are inputted to the respective corresponding dielectric resonators, and the signals produced in the signal output coupling means are subjected to the power composition by the branch lines 45 constituted by the transmission lines for output through the output connector OUT.
  • the branch line shown in Fig. 7 is so set that the electrical length from each output of the dielectric resonator (i.e. equivalent short-circuit face of the resonator) to the first branch point a or b becomes an odd multiple of 1/4 wavelength respectively, while the electrical length from the branch point a or b to another branch point at the second stage (i.e. the point where the central conductor of the output connector OUT is to be connected) becomes a integer multiple of 1/2 wavelength.
  • Figs. 9(A) to Fig. 11 show the radio frequency signal combining/sorting apparatus according to a second embodiment of the present invention.
  • Figs. 9(A) and 9(B) represent an external appearance of a 32 channel radio frequency signal combining/sorting apparatus G2, in which Fig. 9(A) is a view as observed from the signal input connector side, and Fig. 9(B) is a view as observed from the signal output connector side of said apparatus.
  • Figs. 9(A) and 9(B) on one surface of the main body B of the apparatus G2 (Fig. 9(A)), 32 input connectors IN1 to IN32 corresponding to the number of channels are arranged on the same plane, while on the opposite other surface thereof (Fig. 9 (B)), one output connector OUT is provided.
  • a plurality of air cooling fans represented by Numerals 60,61,62,63,64,65,66,67 etc. are mounted.
  • Fig. 10 is a schematic top plan view showing general construction in the interior of the combining/sorting apparatus G2, while Fig. 11 is a schematic side sectional view on an enlarged scale, taken along the line 11-11 in Fig. 10.
  • symbols F1 to F32 denote channel filters respectively composed of TM010 mode dielectric resonators which allow band regions of the allocated channels to pass therethrough.
  • the outputs of the odd numbered channel filters represented by F1 to F31 are composed as one output by the power composing circuit (referred to as a junction unit hereinafter) JU1 composed of the branch lines.
  • the respective outputs of the even numbered channel filters indicated by symbols F2 to F32 are composed as one output by the junction unit JU2.
  • the circulator C1 is adapted to lead the output of the junction unit JU1 to the output connector OUT, while the circulator C2 leads the output of the junction unit JU2 to the output connector OUT.
  • each of symbols JUa to JUh represents a junction unit in which the branch lines composed of the transmission lines are formed on the substrate, so as to compose four resonator outputs respectively.
  • the junction unit JUa composes the respective outputs of the resonators F1,F3,F9 and F11 at a point a.
  • the junction unit Juh composes the respective outputs of the resonators F22, F24,F30 and F32 at a point h.
  • the outputs of these junction units are composed by the branch lines JU1 and JU2 constituted by coaxial cables or the like and supplied to the circulators C1 and C2 respectively.
  • the branch lines of the junction units JUa to JUh are so set that the electrical length thereof from each resonator to the branch point is an odd multiple of 1/4 wavelength.
  • the electrical length from the junction unit to the branch point i or j is set to be an integer multiple of 1/2 wavelength.
  • the electrical length from the respective outputs of the channel filters F1,F3,F9 and F11 (equivalent short-circuiting faces of the respective resonators) to the first branch point a, the electrical length from the respective outputs of the channel filters F5,F7,F13 and F15 to the first branch point c, the electrical length from the respective outputs of the channel filters F17,F19,F25 and F27 to the first branch point c, and the electrical length from the respective outputs of the channel filters F21,F23,F29 and F31 to the first branch point g are respectively set to be odd multiples of 1/4 wavelength.
  • the electrical length from the respective outputs of the channel filters F2,F4,F10 and F12 to the first branch point b, the electrical length from the respective outputs of the channel filters F6,F8,F14 and F16 to the first branch point d, the electrical length from the respective outputs of the channel filters F18,F20,F26 and F28 to the first branch point f, and the electrical length from the respective outputs of the channel filters F22,F24,F30 and F32 to the first branch point h are respectively set to be odd multiples of 1/4 wavelength.
  • the electrical length from the branch points a,c,e and g to the branch point i at the second stage is set to be integer multiples of 1/2 wavelength.
  • the electrical length from the branch point b,d,f, and h to the branch point j at the second stage is set to be integer multiples of 1/2 wavelength.
  • a ceramic cavity 70 has a pillar-like inner dielectric member integrally formed between a bottom wall and a top wall of the cavity, whereby the TM010 mode dielectric resonator is constituted.
  • Signal input coupling loop 72 and signal output coupling loop 73 with respect to this resonator are provided on the bottom wall and top wall of said ceramic cavity 70.
  • 32 channel filters having the construction as described above are accommodated in the metallic case.
  • input connectors IN2,IN4,IN6 and IN8 there are provided input connectors IN2,IN4,IN6 and IN8, and isolators I2,I4,I6 and I8 for supplying signals from the respective input connectors to the coupling loops of the respective resonators (channel filters).
  • the branch line as the junction unit JUb for coupling the respective outputs of the channel filters F2,F4,F10 and F12 (the outputs of the above coupling loops) as shown in Fig. 10, with the point b by the electrical length in the odd multiple of 1/4 wavelength
  • the branch line as the junction unit JUd for coupling the respective outputs of the channel filters F6,F8,F14 and F16 as shown in Fig. 10, with the point d by the electrical length in the odd multiple of 1/4 wavelength.
  • the branch line at the first stage thereof is constituted by the pattern on the board, four example, as a strip line or transmission line, while the branch line at the second stage is constituted by a coaxial cable and the like.
  • the signals inputted from the signal input connectors in the odd numbers represented by the respective input connectors IN1 to IN31 are subjected to the power composition by the four junction units and coaxial cable, etc. so as to be supplied to the circulator C1
  • the signals inputted from the signal input connectors in the even numbers represented by the respective input connectors IN2 to IN32 are subjected to the power composition by the four junction units and coaxial cable etc. so as to be supplied to the circulator C2.
  • Half of the input power to the circulators C1 and C2 is respectively absorbed by the dummy loads R2 and R1, and the composition signal is outputted from the output terminal OUT.
  • the air cooling fans 60 to 67 are adapted to suppress temperature rise of the dielectric resonators by directly cooling the cavities of the 32 dielectric resonators.
  • the air cooling fans 63 and 64 suppress heat generation of the dummy loads R1 and R2. Since the respective dielectric resonators are each of TM mode, with the inner dielectric member being directly in contact with the two faces of the cavity (i.e. by integral molding), the heat of the inner dielectric member is efficiently radiated from its surface through the cavity for reduction of the temperature rise in the inner dielectric member.
  • the frequency variation is stabilized, with a reduction of the insertion loss.
  • the dielectric resonators of single mode are employed as the channel filters, the arrangement may, for example, be so modified as to use one multi-TM mode dielectric resonator as a multi-stage channel filter, or a channel filter for a plurality of channels.
  • Fig. 12 is a circuit diagram showing general construction of the combining/sorting apparatus G2 according to the second embodiment as described so far.
  • the channels allocated to the channel filters F1 to F32 are equal to the numbers of said filters. More specifically, the junction unit JU1 composes the outputs of the channel filters F1 to F31 which allow the odd-numbered channels, to pass therethrough, while the junction unit JU2 composes the outputs of the channel filters F2 to F32 which cause the even-numbered channels to pass therethrough.
  • the output of the junction unit jUl passes through the circulator C1 so as to output 1/2 of its power from the output terminal OUT, and the 1/2 of the power passes through the circulator C2 and is consumed by the dummy load R2. Meanwhile, the output of the junction unit JU2 passes through the circulator C2 so as to output 1/2 of its power from the output terminal OUT, and the 1/2 of the power passes through the circulator C1 and is consumed by the dummy load R1.
  • the foregoing embodiments are related to the 32 channel radio frequency signal combining/sorting apparatus, in order to constitute a radio frequency signal combining/sorting apparatus with more channels, it may be so arranged to provide a plurality of sets of the combining/sorting apparatus having the circuit construction as described above, and to subject the outputs thereof to power composition by hybrid circuits.
  • Fig. 13 shows one example of such circuit construction G3 as referred to above.
  • channel filters F1 to F64 allow band regions of the channels equal to the filter numbers to pass therethrough.
  • Input terminals IN1 to IN64 respectively apply input signals to the respective channel filters through isolators.
  • the junction unit JU1 is arranged to compose the output of the channel filters F1,F5, --- and F61 into one output
  • the junction unit JU2 is adapted to compose the outputs of the channel filters F3,F7, --- and F63
  • the junction unit JU3 is intended to compose the outputs of the channel filters F2,F6, --- and F62
  • the junction unit JU4 is to compose the outputs of the channel filters F4,F8, --- and F64.
  • H1,H2 and H3 represent 3dB hybrid circuits respectively having resistors R1,R2 and R3 as dummy loads.
  • the 3dB hybrid circuit H1 composes the outputs of the two junction units JU1 and JU2, and the 3dB hybrid circuit H2 composes the outputs of other two junction units JU3 and JU4. Further, the 3dB hybrid circuit H3 composes the output of the hybrid circuits H1 and H2.
  • Figs. 14(1) to 14(4) are diagrams showing channels allocated to the respective channel filters shown in Fig. 13, and the transmission characteristics.
  • Figs. 14(1) to 14(4) the transmission characteristics of the respective channel filters for applying signals to the junction units JU1 to JU4 are shown.
  • the passband region of the channel filter to be connected to one power composing circuit consisted of the branch line becomes wider than the channel interval to be transmitted on the whole, and therefore, the apparatus is less affected by the state of Q value and frequency temperature stability, and thus, it becomes possible to achieve the low insertion loss composition. Moreover, even in the case where channel filters provided with the same Q value and frequency temperature stability are employed, a large number of channels set at a narrow channel interval may be transmitted, without increasing the insertion loss.
  • the TM mode dielectric resonator is employed for the channel filter, it is possible to achieve the compact size, with a comparatively high Q value provided, and moreover, by forming the junction unit provided with the branch line of the transmission line and the signal output coupling means, into one unit with the channel filter unit, a further compact size may be achieved on the whole.
  • Another advantage of the apparatus of the present invention is such that, since each channel filter is constituted by the TM mode dielectric resonator, a high heat radiating efficiency is achieved, with the temperature rise being suppressed to be low. Accordingly, the combining/sorting apparatus compact in size, and low in insertion loss and cost, can be advantageously employed for the base stations of the cellular system having a reduced cell radius.

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EP19900123813 1989-12-14 1990-12-11 Radio frequency signal combining/sorting apparatus Expired - Lifetime EP0432729B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP1325536A JPH0828603B2 (ja) 1989-12-14 1989-12-14 送信共用装置
JP325536/89 1989-12-14
JP1331611A JPH0828604B2 (ja) 1989-12-21 1989-12-21 送信共用装置
JP331611/89 1989-12-21

Publications (3)

Publication Number Publication Date
EP0432729A2 EP0432729A2 (en) 1991-06-19
EP0432729A3 EP0432729A3 (en) 1992-07-15
EP0432729B1 true EP0432729B1 (en) 1996-02-07

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Application Number Title Priority Date Filing Date
EP19900123813 Expired - Lifetime EP0432729B1 (en) 1989-12-14 1990-12-11 Radio frequency signal combining/sorting apparatus

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EP (1) EP0432729B1 (fi)
DE (1) DE69025293T2 (fi)
FI (1) FI98257C (fi)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9625416D0 (en) 1996-12-06 1997-01-22 Filtronic Comtek Microwave resonator
SE517745C2 (sv) * 2000-10-20 2002-07-09 Ericsson Telefon Ab L M Kompakt kombineringsenhet
US6624723B2 (en) 2001-07-10 2003-09-23 Radio Frequency Systems, Inc. Multi-channel frequency multiplexer with small dimension
US8784142B2 (en) 2011-12-30 2014-07-22 Regal Beloit America, Inc. Connector block assembly utilizing a single output and associated method of use
DE102013018484B4 (de) * 2013-11-06 2023-12-07 Tesat-Spacecom Gmbh & Co.Kg Dielektrisch gefüllter Resonator für 30GHz-Imux-Applikationen
CN105703044B (zh) * 2016-04-18 2017-02-22 丹凤常兴科技实业有限公司 一种自动调谐合路器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4823851B1 (fi) * 1968-12-19 1973-07-17
US4902991A (en) * 1987-03-12 1990-02-20 Murata Manufacturing Co., Ltd. Radio frequency signal combining/sorting device

Also Published As

Publication number Publication date
FI98257B (fi) 1997-01-31
FI906098A0 (fi) 1990-12-12
DE69025293D1 (de) 1996-03-21
EP0432729A3 (en) 1992-07-15
FI98257C (fi) 1997-05-12
EP0432729A2 (en) 1991-06-19
FI906098A (fi) 1991-06-15
DE69025293T2 (de) 1996-08-22

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