CN210182538U - Duplexer and communication equipment - Google Patents
Duplexer and communication equipment Download PDFInfo
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- CN210182538U CN210182538U CN201822278906.6U CN201822278906U CN210182538U CN 210182538 U CN210182538 U CN 210182538U CN 201822278906 U CN201822278906 U CN 201822278906U CN 210182538 U CN210182538 U CN 210182538U
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Abstract
The application discloses a duplexer and a communication device. The duplexer comprises a first filter, a second filter, a transmitting end, a receiving end and a public end, wherein: the common terminal comprises a first resonator; the first filter is arranged between the transmitting end and the common end and comprises: the N second resonators are sequentially connected between the transmitting end and the common end; at least one first cross-coupling element connecting two non-adjacent second resonators of the N second resonators; the second filter is arranged between the receiving end and the public end and comprises: the M second resonators are sequentially connected between the receiving end and the common end; at least one second cross-coupling element connecting two non-adjacent ones of the M second resonators. In this way, a high degree of isolation between the first frequency band signal transmitted by the duplexer and the received second frequency band signal can be achieved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a duplexer and a communications device.
Background
In a mobile communication system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must accurately control its upper and lower limit frequencies. And should also consider maintaining high isolation between the passbands of the channels if both transmit and receive channels are present.
The duplexer is a main accessory of a different-frequency duplex radio station, a relay station and the like, generally comprises two groups of filters with different frequencies, and can realize the receiving and sending of signals.
The inventor of the present application finds, in long-term research and development work, that the existing duplexer has poor characteristics such as out-of-band rejection of the transmission frequency band and the reception frequency band due to unreasonable transmission zero setting, and therefore, the existing duplexer is difficult to achieve high isolation between the reception signal and the transmission signal.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application mainly solved provides a duplexer and communications facilities to realize the high isolation of transmitting signal and received signal.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a duplexer including a first filter, a second filter, a transmitting terminal, a receiving terminal, and a common terminal, wherein: the common terminal comprises a first resonator; the first filter is arranged between the transmitting end and the common end and comprises: the N second resonators are sequentially connected between the transmitting end and the common end; at least one first cross-coupling element connecting two non-adjacent second resonators of the N second resonators; the second filter is arranged between the receiving end and the public end and comprises: the M second resonators are sequentially connected between the receiving end and the common end; at least one second cross-coupling element connecting two non-adjacent ones of the M second resonators.
The at least one first cross coupling element comprises a first capacitive cross coupling element and a first inductive cross coupling element, the nth second resonator and the (N + 3) th second resonator in the N second resonators are connected through the first capacitive cross coupling element, the (N + 1) th second resonator and the (N + 3) th second resonator are connected through the first capacitive cross coupling element, the (N + 6) th second resonator and the (N + 8) th second resonator are connected through the first capacitive cross coupling element, and the (N + 5) th second resonator and the (N + 8) th second resonator are connected through the first inductive cross coupling element; the first capacitive cross coupling element is a flying rod, and two ends of the flying rod are respectively connected with two non-adjacent second resonators; the first inductive cross-coupling element is a window arranged between two non-adjacent second resonators.
The at least one first cross coupling element comprises a first capacitive cross coupling element and a first inductive cross coupling element, the nth second resonator and the (N + 3) th second resonator in the N second resonators are connected through the first capacitive cross coupling element, the (N + 1) th second resonator and the (N + 3) th second resonator are connected through the first capacitive cross coupling element, the (N + 8) th second resonator and the (N + 10) th second resonator are connected through the first capacitive cross coupling element, and the (N + 5) th second resonator and the (N + 7) th second resonator are connected through the first inductive cross coupling element.
The at least one second cross-coupling element comprises a second inductive cross-coupling element, the mth second resonator and the M +2 second resonators in the M second resonators are connected through the second inductive cross-coupling element, and the M +3 second resonators and the M +5 second resonators are connected through the second inductive cross-coupling element; the second inductive cross-coupling element is a window arranged between two non-adjacent second resonators.
Wherein the at least one second cross-coupling element comprises a second inductive cross-coupling element, the mth second resonator and the M +2 th second resonator of the M second resonators are connected through the second inductive cross-coupling element, and the M +4 th second resonator and the M +6 th second resonator are connected through the second inductive cross-coupling element.
Wherein N is 11, N is 1, M is 9, and M is 1.
Wherein the second resonator includes: a cavity; the resonance rod is accommodated in the cavity and provided with a hollow inner cavity; and one end of the tuning rod is arranged in the hollow inner cavity.
The resonance rod of the second resonator of the first filter comprises an L-shaped side wall and a bottom wall, wherein the L-shaped side wall and the bottom wall form a hollow inner cavity; the inner diameter of the cavity of the second resonator of the first filter is 29.5mm, and the inner diameter of the cavity of the second resonator of the second filter is 29.5 mm; the cavity height of the second resonator of the first filter is 21mm, and the cavity height of the second resonator of the second filter is 21 mm.
Wherein, the first frequency band is 1805-1880MHz, and the second frequency band is 1710-1785 MHz.
In order to solve the above technical problem, another technical solution adopted by the present application is: a communication device is provided, which comprises the duplexer and an antenna, wherein the antenna is connected with the common terminal of the duplexer.
The beneficial effect of this application is: different from the prior art, the duplexer in the embodiment of the present application includes a first filter, a second filter, a transmitting end, a receiving end, and a common end, where: the common terminal comprises a first resonator; the first filter is arranged between the transmitting end and the common end and comprises: the N second resonators are sequentially connected between the transmitting end and the common end; at least one first cross-coupling element connecting two non-adjacent second resonators of the N second resonators; the second filter is arranged between the receiving end and the public end and comprises: the M second resonators are sequentially connected between the receiving end and the common end; at least one second cross-coupling element connecting two non-adjacent ones of the M second resonators. In the duplexer of the embodiment of the application, two non-adjacent second resonators of the N second resonators of the first filter of the duplexer are connected through the first cross-coupling element, so that the transmission zero of the first filter can be realized, and the characteristics of the first frequency band signal, such as better out-of-band rejection, can be obtained; two non-adjacent second resonators of the M second resonators of the second filter are connected by the second cross-coupling element, and a transmission zero point of the second filter can be realized to obtain characteristics of the second frequency band signal, such as excellent out-of-band rejection, and therefore, high isolation between the first frequency band signal transmitted by the duplexer and the received second frequency band signal can be realized.
Drawings
Fig. 1 is a schematic diagram of a topology of an embodiment of a duplexer of the present application;
figure 2 is a side view of a first filter and a first resonator of the duplexer of the embodiment of figure 1;
FIG. 3 is a schematic 3D structure diagram of the first filter of the embodiment of FIG. 2;
fig. 4 is a schematic topology diagram of another embodiment of the first filter of the duplexer of the present application;
figure 5 is a side view of a second filter of the duplexer of the embodiment of figure 1;
FIG. 6 is a schematic 3D structure diagram of a second filter of the embodiment of FIG. 5;
fig. 7 is a schematic topology diagram of another embodiment of a second filter of a duplexer of the present application;
figure 8 is a schematic diagram of the arrangement of the filter cavities of the duplexer of the embodiment of figure 1;
fig. 9 is a schematic structural diagram of an embodiment of a connection structure of a first filter and a second resonator in a duplexer in the present application;
fig. 10 is a schematic structural diagram of an embodiment of a second resonator of the first filter in the duplexer in fig. 1;
FIG. 11 is a cross-sectional view of the resonant rod of the embodiment of FIG. 10;
figure 12 is a schematic diagram of an embodiment of a second resonator of a second filter in the duplexer of figure 1;
fig. 13 is a schematic circuit diagram of the duplexer of the embodiment of fig. 1;
FIG. 14 is a diagram illustrating the results of a full cavity simulation of the embodiment of FIG. 1;
figure 15 is a diagram showing the results of a full cavity simulation of the first filter of the duplexer of figure 1;
figure 16 is a diagram showing the results of a full cavity simulation of the second filter of the duplexer of figure 1;
fig. 17 is a schematic structural diagram of an embodiment of the communication device of the present application.
Detailed Description
The present application will be described in detail with reference to the drawings and examples.
The present application first proposes a duplexer, as shown in fig. 1, fig. 1 is a schematic topology structure diagram of an embodiment of the duplexer in the present application. The duplexer 101 of the present embodiment includes a first filter 102, a second filter 103, a transmitting end 104, a receiving end 105, and a common end 106, where the first filter 102 is disposed between the transmitting end 104 and the common end 106, and the second filter 103 is disposed between the receiving end 105 and the common end 106. The common terminal 106 includes a first resonator 107; the first filter 102 includes N second resonators 108 and at least one first cross-coupling element 109, the N second resonators 108 are sequentially connected between the transmitting end 104 and the common end 106, and the first cross-coupling element 109 connects two non-adjacent second resonators 108 of the N second resonators 108; the second filter 103 includes M second resonators 108 and at least one second cross-coupling element 110, where the M second resonators 108 are sequentially connected between the receiving end 105 and the common end 106, and the second cross-coupling element 110 connects two non-adjacent second resonators 108 among the M second resonators 108.
N, M are all natural numbers of 3 or more.
The resonator is a communication device for frequency selection and signal suppression, and the resonator of the present embodiment may be a quartz crystal resonator, a ceramic resonator, or the like. The resonator mainly plays a role of frequency control, and is required for communication equipment which involves transmission and reception of frequencies.
In the present embodiment, the first filter 102 forms a required frequency response curve under the combined action of the N second resonators 108 to transmit the first frequency band signal, and the first cross-coupling element is disposed between the non-adjacent second resonators 108, so that the transmission zero of the first filter 102 can be realized, and characteristics such as better out-of-band rejection of the first frequency band signal can be obtained.
In the second filter 103 of this embodiment, a desired frequency response curve is formed under the combined action of the M second resonators 108 to receive the second frequency band signal, and a second cross-coupling element is disposed between the non-adjacent second resonators 108, so that a transmission zero of the second filter 103 can be realized, and characteristics of the second frequency band signal, such as superior out-of-band rejection, can be obtained.
The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.
Different from the prior art, the first filter 102 of the present embodiment obtains a transmission zero of the first frequency band signal by arranging the first cross coupling element 109 between the non-adjacent second resonators 108, and the second filter 103 obtains a transmission zero of the second frequency band signal by arranging the second cross coupling element 110 between the non-adjacent second resonators 108, so that both the first frequency band signal and the second frequency band signal have excellent out-of-band rejection and other characteristics, and therefore, the duplexer 101 of the present embodiment can realize high isolation between the first frequency band signal and the second frequency band signal.
Optionally, the at least one first cross-coupling element 109 of this embodiment includes a first capacitive cross-coupling element 111, a first capacitive cross-coupling element 112, a first capacitive cross-coupling element 113, and a first inductive cross-coupling element 114, an nth second resonator and an N +2 th second resonator 108 of the N second resonators 108 are connected by the first capacitive cross-coupling element 111, the nth second resonator 108 and an N +3 th second resonator 108 are connected by the first capacitive cross-coupling element 112, an N +6 th second resonator 108 and an N +8 th second resonator 108 are connected by the first capacitive cross-coupling element 113, and an N +5 th second resonator 108 and an N +8 th second resonator 108 are connected by the first inductive cross-coupling element 114.
Wherein N is a natural number, and N is greater than or equal to N + 8.
Capacitive or inductive cross-coupling elements are arranged between the nth second resonator and the (n + 2) th second resonator 108, between the nth second resonator 108 and the (n + 3) th second resonator 108, between the (n + 6) th second resonator 108 and the (n + 8) th second resonator 108, and between the (n + 5) th second resonator 108 and the (n + 8) th second resonator 108 of the embodiment, so that at least 4 transmission zeros of the first filter 102 can be realized, and characteristics such as better out-of-band rejection of the first frequency band signal can be obtained.
Alternatively, as shown in fig. 1-3, fig. 2 is a side view of a first filter and a first resonator of the duplexer of the embodiment of fig. 1; fig. 3 is a schematic 3D structure diagram of the first filter of the embodiment of fig. 2. The first capacitive cross-coupling elements 111, 112 and 113 of the present embodiment are all flying rods, and two ends of the flying rods are respectively connected to two non-adjacent second resonators 108; the first inductive cross-coupling element 114 is a window arranged between two non-adjacent second resonators 108
To adjust the coupling strength between two non-adjacent second resonators 108, a first adjustment screw 116 may be disposed at the window. Of course, in other embodiments, in order to enhance the coupling strength between two non-adjacent second resonators, a coupling rib may be disposed in the window.
Optionally, coupling ribs 117 are disposed between the nth second resonator 108 and the N +1 th second resonator 108, between the N +2 th second resonator 108 and the N +3 th second resonator, between the N +8 th second resonator 108 and the N +9 th second resonator 108, and between the N +9 th second resonator 108 and the N +10 th second resonator 108 in the N second resonators 108 of the first filter 102, so as to enhance the coupling strength between two adjacent second resonators 108.
Optionally, a second adjusting screw 118 is disposed between any two adjacent second resonators 108 of the present embodiment to adjust the coupling strength between two adjacent second resonators 108.
In order to realize at least 4 transmission zeros of the first filter to obtain characteristics such as better out-of-band rejection of the first band signal, other structures may also be adopted, for example, as shown in fig. 4, fig. 4 is a schematic topological structure diagram of another embodiment of the first filter of the duplexer of the present application. In this embodiment, the nth second resonator 402 and the (N + 2) th second resonator 402 of the N second resonators 402 of the first filter 401 are connected by the first capacitive cross-coupling element 403, the nth second resonator 402 and the (N + 3) th second resonator 402 are connected by the first capacitive cross-coupling element 404, the (N + 8) th second resonator 402 and the (N + 10) th second resonator 402 are connected by the first capacitive cross-coupling element 405, and the (N + 5) th second resonator 402 and the (N + 7) th second resonator 402 are connected by the first inductive cross-coupling element 406.
Of course, in other embodiments, the first cross-coupling elements may have other configurations, combinations, and arrangements.
In other embodiments, the arrangement of the coupling rib and the first adjusting screw between the non-adjacent second resonators of the first filter and the coupling rib and the second adjusting screw between the adjacent second resonators of the first filter may be different from the above combination.
Optionally, as shown in fig. 1, the at least one second cross-coupling element 110 of the present embodiment includes a second inductive cross-coupling element 119 and a second inductive cross-coupling element 120, an mth second resonator 108 and an M +2 th second resonator 108 of the M second resonators 108 are connected by the second inductive cross-coupling element 119, and an M +3 th second resonator 108 and an M +5 th second resonator 108 are connected by the second inductive cross-coupling element 120.
Wherein M is a natural number, and M is greater than or equal to M + 5.
In this embodiment, inductive cross-coupling elements are disposed between the m-th second resonator 108 and the m + 2-th second resonator 108, and between the m + 3-th second resonator 108 and the m + 5-th second resonator 108 of the second filter 103, so that at least 2 transmission zeros of the second filter 103 can be implemented to obtain characteristics of a second frequency band signal, such as better out-of-band rejection.
Alternatively, as shown in fig. 1, 5 and 6, fig. 5 is a side view of the second filter of the duplexer of the embodiment of fig. 1; fig. 6 is a schematic 3D structure diagram of the second filter of the embodiment of fig. 2. The second inductive cross-coupling elements 119 and 120 of this embodiment are windows arranged between two non-adjacent second resonators 108.
To enhance the coupling strength between two non-adjacent second resonators 108, a first adjusting screw 121 may be disposed in the window.
Optionally, coupling ribs 122 are disposed between the mth second resonator 108 and the M +1 th second resonator 108, between the M +1 th second resonator 108 and the M +2 th second resonator 108, between the M +2 th second resonator 108 and the M +3 th second resonator 108, between the M +3 th second resonator 108 and the M +4 th second resonator 108, and between the M +7 th second resonator 108 and the M +8 th second resonator 108 in the M second resonators 108 of the second filter 102, so as to enhance the coupling strength between two adjacent second resonators 108.
Optionally, a second adjusting screw 123 is disposed between any two adjacent second resonators 108 of the present embodiment to adjust the coupling strength between two adjacent second resonators 108.
In order to implement at least 2 transmission zeros of the second filter to obtain the characteristics of better out-of-band rejection and the like of the second frequency band signal, other structures may also be adopted, for example, as shown in fig. 7, fig. 7 is a schematic topological structure diagram of another embodiment of the second filter of the present application. In this embodiment, the M-th second resonator 702 and the M + 2-th second resonator 702 of the M second resonators 702 of the second filter 701 are connected by the second inductive cross-coupling element 703, and the M + 4-th second resonator 702 and the M + 6-th second resonator 702 are connected by the second inductive cross-coupling element 704.
Of course, in other embodiments, the second cross-coupling elements may have other configurations, combinations, and arrangements.
In other embodiments, the arrangement of the coupling rib and the first adjusting screw between the non-adjacent second resonators of the second filter and the arrangement of the coupling rib and the second adjusting screw between the adjacent second resonators of the second filter may be different from the above combination.
Alternatively, N is 11, N is 1, M is 9, and M is 1. In the first filter 102, the first capacitive cross-coupling element 111 between the 1 st second resonator 108 and the 3 rd second resonator 108 can generate a capacitive transmission zero at the low end; the first capacitive cross-coupling element 112 between the 1 st second resonator 108 and the 4 th second resonator 108 is capable of generating an inductive transmission zero at the high end, and the first capacitive cross-coupling element 113 between the 7 th second resonator 108 and the 9 th second resonator 108 is capable of generating a capacitive transmission zero at the low high end; the first inductive cross-coupling element 114 between the 6 th second resonator 108 and the 9 th second resonator 108 can generate one capacitive transmission zero at the low end, and therefore, the first filter 102 of the present embodiment can generate 4 transmission zeros.
The order of the intensity of the low-end transmission zero of the first filter 102 is: the strength of the transmission zero point between the 6 th second resonator 108 and the 9 th second resonator 108 is the strongest, the strength of the transmission zero point between the 7 th second resonator 108 and the 9 th second resonator 108 is the stronger, and the strength of the transmission zero point between the 1 st second resonator 108 and the 4 th second resonator 108 is the weakest.
The first filter 102 of this embodiment is capable of transmitting the first frequency band signal, and the frequency band of the first frequency band signal is 1805 and 1880 MHZ. Of course, in other embodiments, the number and connection mode of the N resonators 108 in the first filter 102 may be adjusted to obtain signals in other frequency bands.
In the second filter 103, the first capacitive cross-coupling element 119 between the 1 st second resonator 108 and the 3 rd second resonator 108 can generate an inductive transmission zero at the high end; the first inductive cross-coupling element 118 between the 4 th second resonator 108 and the 6 th second resonator 108 is capable of generating one inductive transmission zero at the high end, and therefore, the second filter 103 of the present embodiment is capable of generating 2 transmission zeros.
The strength sequence of the high-end transmission zero intensity of the second filter 103 is as follows: the strength of the transmission zero point between the 1 st second resonator 108 and the 3 rd second resonator 108 is strong, and the strength of the transmission zero point between the 4 th second resonator 108 and the 6 th second resonator 108 is weak.
The second filter 103 of this embodiment is capable of receiving the second band signal, which has a band of 1710-. Of course, in other embodiments, the number and connection manner of the M resonators 108 in the second filter 103 may be adjusted to obtain signals in other frequency bands.
The two adjacent resonators in the embodiment of the present application refer to two resonators connected in sequence, and the non-adjacent resonators refer to resonators that are not connected in sequence.
The shape, arrangement direction and the like of the windows are not limited in the embodiments of the present application.
In this embodiment, the row cavities of the N second resonators 108 of the first filter 102 and the row cavities of the M second resonators 108 of the second filter 103 are all irregular shapes (as shown in fig. 3, 6, and 8, of course, different row cavity modes, such as regular shapes like W-type or Z-type, or other irregular shapes, may also be adopted to implement the above frequency band.
Alternatively, as shown in fig. 9, a coupling rib 902 of an adjusting screw 901 may be disposed between the first resonator 107 and the second resonator 108 in this embodiment. Of course, in other embodiments, the connection between the first resonator 107 and the second resonator 108 may be implemented in other manners.
Wherein, only part of the structure in the resonant cavity is shown in the 3D diagram of the application.
Alternatively, as shown in fig. 10 and fig. 11, fig. 10 is a schematic structural diagram of an embodiment of a second resonator of the first filter in the duplexer in fig. 1; fig. 11 is a cross-sectional view of the resonant rod of the embodiment of fig. 10. The second resonator 1001 of the present embodiment includes a cavity 1002, a resonant rod 1003 and a tuning rod 1004, which are accommodated in the cavity 1002, and one end of the tuning rod 1004 is disposed in the hollow cavity 1101.
The resonant rod 1003 of the present embodiment includes an L-shaped sidewall 1102 and a bottom wall 1103 forming a hollow cavity 1101, one end of the L-shaped sidewall 1102 is connected to the bottom wall 1103, and the other end of the L-shaped sidewall 1102 extends toward a side away from the hollow cavity 1101.
In this embodiment, the L-shaped sidewall 1101 and the bottom wall 1102 are integrally formed.
The second resonator 1001 of this embodiment further includes a fixing member 1005 disposed on the bottom wall of the cavity 1002, the bottom wall 1102 of the resonant rod 1002 is provided with a through hole 1104, and the fixing member 1005 penetrates through the through hole 1104 to fix the resonant rod 1003 on the bottom wall of the cavity 1001. The fixing element 1005 may or may not extend into the hollow cavity 1101 of the resonant rod 1003, and is not particularly limited.
The first resonator 107 of the present embodiment may have the same structure as the second resonator 1001.
Optionally, the inner diameter of the cavity 1002 of the second resonator 1001 is 29.5 mm; the height of the cavity 1002 of the second resonator 1001 is 21 mm.
Alternatively, the maximum outer diameter of the resonating bar 1002 may range from [21.00mm to 0.05mm, 21.00mm +0.05mm ], and the minimum outer diameter may range from [12.50mm to 0.05mm, 12.50mm +0.05mm ]; the hollow lumen 1101 may range from [10.50mm-0.05mm, 10.50mm +0.05mm ]; the height of the resonant bar 1002 may range from [18.20mm-0.05mm, 18.20mm +0.05mm ]; the maximum inner diameter range of the through hole 1104 can be [10.50mm-0.05mm, 10.50mm +0.05mm ], and the minimum inner diameter range can be 4.50 mm; the height of the end of the L-shaped sidewall 1102 distal from the bottom wall 1103 to the bottom wall 1102 may range from [15.20mm-0.05mm, 15.20mm +0.05mm ], and so forth.
Other parameters and configurations of the L-shaped sidewall 1102 and the bottom wall 1103 can be as shown in FIG. 11.
Alternatively, as shown in fig. 12, fig. 12 is a schematic structural diagram of an embodiment of a second resonator of the second filter in the duplexer in fig. 1. The second resonator 1201 of the present embodiment includes a cavity 1202, a resonant rod 1203 housed in the cavity 1202, and a tuning rod 1204, wherein one end of the tuning rod 1204 is disposed in a hollow inner cavity (not shown).
The second resonator 1201 of this embodiment may adopt the same fixed structure as the second resonator 1001 described above, and details thereof are omitted.
Optionally, the inner diameter a2 of the cavity 1202 of the second resonator 1201 is 28 mm; the height of the cavity 1202 of the second resonator 1201 is 21 mm; the resonant rod 1203 has an outer diameter of 5mm, an inner diameter of 3.2mm and a height of 19.4 mm.
Alternatively, the resonant rod 1003 of the second resonator 1001 and the resonant rod 1203 of the second resonator 1201 may be obtained by using a method of taking out materials, such as turning, milling, drilling, grinding and polishing. The L-shaped sidewall 1102 of the resonant bar 1003 of the second resonator 1001 is connected to the bottom wall 1103 smoothly.
Optionally, the second resonator 1001 and the second resonator 1201 are both TEM metal coaxial filters; the unloaded quality factor Q1 of the second resonator 1001 is equal to the unloaded quality factor Q2 of the second resonator 1201, specifically, the ranges of Q1 and Q2 are [ 2700-; the second resonator 1001 and the second resonator 1201 are both coaxial resonators; the resonant rod 1003 of the second resonator 1001 is an M8 screw and is made of red copper or silver, and the resonant rod 1203 of the second resonator 1201 of the second filter 103 is an M4 screw and is made of copper or silver, however, in other embodiments, the resonant rod 1003 and the resonant rod 1203 may be made of other sizes and other materials; the frequency offset X1 of the second resonator 1001 is smaller than the frequency offset X2 of the second resonator 1201, specifically, the range of X1 is [ -0.15MHz, 0.15MHz ], the range of X2 is [ -2.50MHz, 2.5MHz ], wherein the high temperature, the normal temperature and the low temperature corresponding to the frequency offset X1 and the frequency offset X2 are-40 °, 25 ° and 95 °, respectively.
In an application scenario, in order to implement a duplexer with parameter performance shown in table 1, a topology structure shown in fig. 1 is first established according to each parameter in table 1, and a circuit model (shown in fig. 13) corresponding to the topology structure is established in an Advanced Design System (ADS); then, circuit simulation is performed on the circuit model, so that the result of the circuit simulation satisfies that the transmission signal of the first frequency band 1805-1880MHz is obviously isolated from the reception signal of the second frequency band 1710-1785MHz, as shown in fig. 14, the first frequency band has 4 transmission zeros (shown by dashed circles): the number of the bottom ends is 3, and the number of the high ends is 1; the second band has 2 transmission zeroes (shown as dashed circles): the high end is 2. The method, principle and intensity distribution for obtaining the transmission zero point are not described in detail here. In the figure, mij represents a certain frequency point and the frequency thereof, dB (i, j) represents the signal power of the frequency point, mij can reflect the signal power of the frequency point in a frequency band, and can further reflect parameters such as out-of-band rejection, insertion loss, return loss, and the like of the frequency band (specifically, refer to fig. 15 and fig. 16), the selection of mij can be determined according to the actual needs of a user, as can be seen from fig. 14, the transmitting signal of the first frequency band 1805 and 1880MHz is obviously isolated from the receiving signal of the second frequency band 1710 and 1785 MHz; further, the single-cavity and full-cavity simulations were performed on the duplexer 101 through a High Frequency Structure Simulator (HFSS) so that the duplexer 101 meets various index requirements shown in table 1.
Specifically, in the single-cavity simulation, the second resonator 1001 of the first filter 102 and the second resonator 1201 of the second filter 103 are mainly simulated, so that the Q1 of the second resonator 1001 of the first filter 102 is 2700, the frequency offset at a low temperature of-40 ° is-0.15 MHz, the frequency offset at a normal temperature of 25 ° is 0.00MHz, and the frequency offset at a high temperature of 95 ° is 0.15MHz, so that the Q2 of the second resonator 1201 of the second filter 103 is 2700, the frequency offset at a low temperature of-40 ° is-2.50 MHz, the frequency offset at a normal temperature of 25 ° is 0.00MHz, and the frequency offset at a high temperature of 95 ° is 2.5 MHz.
In the full-cavity simulation, as shown in fig. 15 and table 2, the curve S21 is a frequency band curve, and as can be known from the test data of the frequency point a1 and the frequency point a2, the first frequency band is 1805-1880 MHz; as can be seen from the test data of the frequency points a1-a9, the out-of-band rejection of the first frequency band substantially meets the requirements shown in Table 1; the insertion loss refers to the loss of load power occurring due to the insertion of an element or device somewhere in the transmission system, which can be represented by a curve S21, and as can be seen from the test data of the frequency points a1-a3 on the curve S21, the insertion loss of the first frequency band substantially satisfies the requirements shown in table 1; curve S11 is a return loss curve, the return loss is a parameter representing the reflection performance of a signal, the return loss indicates that a portion of the incident power is reflected back to the signal source, and curve S22 is another return loss curve. Other performance parameters related to the first filter 102 are not described here.
As shown in fig. 16 and table 3, fig. 16 is a diagram illustrating the full cavity simulation result of the second filter of the embodiment of fig. 1. Wherein the curve S21 is a frequency band curve, and the first frequency band is 1710-1785MHz as can be known from the test data of the frequency point b1 and the frequency point b2, and the out-of-band rejection of the first frequency band substantially satisfies the requirements shown in Table 1 as can be known from the test data of the frequency points b1-b 8; the insertion loss can be shown by the curve S21, and as can be seen from the test data of the frequency points b1, b2 and b7 on the curve S21, the insertion loss of the first frequency band substantially meets the requirements shown in table 1; curve S11 is a return loss curve and curve S22 is another return loss curve, which are not described here in a corresponding way with respect to other performance parameters of the second filter 103.
TABLE 1 performance index for an embodiment of a duplexer
Wherein the power values shown in table 1 are absolute values of power.
In the whole design process, the requirements of simplifying the model of the circuit, reasonably arranging cavities and the like are met, so that the design is favorable for realization and good in reliability, and a large amount of cost is saved, so that the circuit can be produced in batches.
TABLE 2 test data for the first filter
| a1 | 1.8050GHz | -1.6117dB | a6 | 1.7997GHz | -6.7892dB |
| a2 | 1.8800GHz | -1.2774dB | a7 | 1.8853GHz | -7.5630dB |
| a3 | 1.8455GHz | -0.7568dB | a8 | 1.8895GHz | -25.362dB |
| a4 | 1.7890GHz | -112.87dB | a9 | 1.9190GHz | -96.626dB |
| a5 | 1.8000GHz | -5.1896dB |
TABLE 3 test data for the second filter
| b1 | 1.7100GHz | -0.8547dB | b5 | 1.6980GHz | -12.925dB |
| b2 | 1.7850GHz | -1.0468dB | b6 | 1.8020GHz | -74.898dB |
| b3 | 1.6930GHz | -22.056dB | b7 | 1.7450GHz | -0.6156dB |
| b4 | 1.8825GHz | -106.41dB |
The present application further provides a communication device, as shown in fig. 17, the communication device 1701 in this embodiment includes a duplexer 1702 and an antenna 1703, where the duplexer 1702 includes a first filter 1704 and a second filter 1705, and the antenna 1703 is connected to a common terminal (not shown) of the duplexer 1702. The structure and operation of the first filter 1704 and the second filter 1705 are not described in detail herein.
Different from the prior art, two non-adjacent second resonators of the N second resonators of the first filter of the duplexer in the embodiment of the present application are connected by the first cross-coupling element, so that a transmission zero of the first filter can be realized to obtain superior out-of-band rejection and other characteristics of the first frequency band signal; two non-adjacent second resonators of the M second resonators of the second filter are connected by the second cross-coupling element, and a transmission zero point of the second filter can be realized to obtain characteristics of the second frequency band signal, such as excellent out-of-band rejection, and therefore, high isolation between the first frequency band signal transmitted by the duplexer and the received second frequency band signal can be realized.
In addition, in the design process of the duplexer of the embodiment, the requirement of the index performance specification is considered, and the problems in the aspects of process complexity and cost in the production process are also considered, so that the index performance of the duplexer is good, the process flow is simplified, the debugging is smooth and many, and the economic benefit is greatly improved.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A duplexer, comprising a first filter, a second filter, a transmitting end, a receiving end, and a common end, wherein:
the common terminal comprises a first resonator;
the first filter is disposed between the transmitting terminal and the common terminal, and includes:
the N second resonators are sequentially connected between the transmitting end and the common end;
at least one first cross-coupling element connecting two non-adjacent second resonators of the N second resonators;
the second filter is disposed between the receiving end and the common end, and includes:
the M second resonators are sequentially connected between the receiving end and the common end;
at least one second cross-coupling element connecting two non-adjacent second resonators of the M second resonators;
wherein the at least one first cross-coupling element includes a first capacitive cross-coupling element and a first inductive cross-coupling element, an nth second resonator and an N +2 th second resonator of the N second resonators are connected by the first capacitive cross-coupling element, an nth second resonator and an N +3 th second resonator are connected by the first capacitive cross-coupling element, an N +6 th second resonator and an N +8 th second resonator are connected by the first capacitive cross-coupling element, and an N +5 th second resonator and an N +8 th second resonator are connected by the first inductive cross-coupling element.
2. The duplexer of claim 1,
the first capacitive cross coupling element is a flying rod, and two ends of the flying rod are respectively connected with the two non-adjacent second resonators;
the first inductive cross-coupling element is a window arranged between the two non-adjacent second resonators.
3. The duplexer of claim 1, wherein the at least one first cross-coupling element comprises a first capacitive cross-coupling element and a first inductive cross-coupling element, wherein an nth second resonator and an N +2 th second resonator of the N second resonators are connected by the first capacitive cross-coupling element, an nth second resonator and an N +3 th second resonator are connected by the first capacitive cross-coupling element, an N +8 th second resonator and an N +10 th second resonator are connected by the first capacitive cross-coupling element, and an N +5 th second resonator and an N +7 th second resonator are connected by the first inductive cross-coupling element.
4. The duplexer of claim 2, wherein the at least one second cross-coupling element comprises a second inductive cross-coupling element, wherein an M-th second resonator and an M + 2-th second resonator of the M second resonators are connected by the second inductive cross-coupling element, and wherein an M + 3-th second resonator and an M + 5-th second resonator are connected by the second inductive cross-coupling element;
the second inductive cross-coupling element is a window arranged between the two non-adjacent second resonators.
5. The duplexer of claim 2, wherein the at least one second cross-coupling element comprises a second inductive cross-coupling element, wherein an M-th second resonator and an M + 2-th second resonator of the M second resonators are connected by the second inductive cross-coupling element, and wherein an M + 4-th second resonator and an M + 6-th second resonator are connected by the second inductive cross-coupling element.
6. The duplexer of claim 4, wherein N is 11, N is 1, M is 9, and M is 1.
7. The duplexer of claim 1, wherein the second resonator comprises:
a cavity;
the resonance rod is accommodated in the cavity and provided with a hollow inner cavity;
a tuning rod, one end of the tuning rod being disposed within the hollow interior.
8. The duplexer of claim 7, wherein the resonant bar of the second resonator of the first filter includes an L-shaped sidewall and a bottom wall forming the hollow inner cavity, one end of the L-shaped sidewall being connected to the bottom wall, and the other end of the L-shaped sidewall extending toward a side away from the hollow inner cavity;
the inner diameter of the cavity of the second resonator of the first filter is 29.5mm, and the inner diameter of the cavity of the second resonator of the second filter is 28 mm;
the cavity height of the second resonator of the first filter is 21mm, and the cavity height of the second resonator of the second filter is 21 mm.
9. The duplexer in claim 1, wherein the first band bandwidth of the duplexer is 1805-1880 MHz; the second band bandwidth of the duplexer is 1710-.
10. A communication device comprising a duplexer of any of claims 1-9 and an antenna, the antenna being connected to a common terminal of the duplexer.
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| CN201822278906.6U CN210182538U (en) | 2018-12-31 | 2018-12-31 | Duplexer and communication equipment |
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