Multipath coupler suitable for medium wave receiver
By designing a multi-coupler including a single-pole three-throw switch and a coupled bandpass filter network, the problem of the inability of the medium-wave receiver to work simultaneously and lack of anti-interference capabilities is solved, and the function of multiple bandpass filter channels sharing a receiving antenna is realized, which improves the anti-interference capability of the receiver.
Patent Information
- Application Number
- CN202510145668.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2025-05-27
AI Technical Summary
The existing mid-wave receivers cannot meet the needs of multi-frequency points at the same time, and the broadband filter cannot effectively resist interference in complex electromagnetic environments, resulting in a decrease in the anti-interference ability of the receiver.
A multi-coupler is designed, including several bandpass filter channels, each bandpass filter channel contains a single-pole three-throw switch, two coupled bandpass filter networks and a single-pole double-throw switch. Through these switches and filter networks, multiple bandpass filter channels share a receiving antenna.
It realizes that multiple bandpass filter channels share one receiving antenna, which meets the use requirement of multiple narrowband filters with high out-of-band rejection to share one antenna, and improves the anti-interference ability of the receiver.
Smart Images
Figure CN120049898A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of radio frequency circuits, and particularly to a multi-way coupler suitable for a medium-wave receiver. Background Art
[0002] At present, there are two forms of the frequency selection network of a medium-wave receiver. One is an electrically tunable filter, and the other is a segmented band-pass filter. Only one filter with a passband is selected at the same time in these two frequency selection circuits. Obviously, this form can no longer meet the requirement of multi-frequency point simultaneous operation when networking medium waves. If a broadband filter is selected, it cannot cope with a complex electromagnetic environment, and the anti-interference ability of the receiver is significantly reduced. Therefore, it is an urgent need to design a multi-way coupler that can meet the sharing of a common antenna by multiple frequency points and has excellent filtering performance for medium-wave networking. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a multi-way coupler suitable for a medium-wave receiver, which can realize the sharing of a common receiving antenna by multiple band-pass filter channels, thereby meeting the usage requirement of sharing a common antenna by multiple narrow-band filters with high out-of-band rejection.
[0004] In order to solve the above technical problem, the technical solution adopted by the present invention is as follows: A multi-way coupler suitable for a medium-wave receiver includes a plurality of band-pass filtering channels. Each band-pass filtering channel includes a single-pole triple-throw switch, two coupled band-pass filtering networks, and a single-pole double-throw switch. The input end of the single-pole triple-throw switch is electrically connected to the receiving antenna of the medium-wave receiver, the output ends of the single-pole triple-throw switch are respectively electrically connected to the input ends of the two coupled band-pass filtering networks, and the input ends of the single-pole double-throw switch are respectively electrically connected to the output ends of the two coupled band-pass filtering networks.
[0005] The beneficial effect of the present invention is as follows: The band-pass filtering channel provided in this solution includes a single-pole triple-throw switch, two coupled band-pass filtering networks, and a single-pole double-throw switch. The use of the single-pole triple-throw switch array avoids the simultaneous access of the coupled band-pass filtering networks of adjacent channels, which affects the filtering performance. Through the single-pole triple-throw switch, one of the two coupled band-pass filtering networks of adjacent channels can be selected for access, so as to achieve the purpose that a receiving antenna can be connected to any one or more coupled band-pass filtering networks, and further realize the sharing of a common receiving antenna by multiple band-pass filter channels, meeting the usage requirement of sharing a common antenna by multiple narrow-band filters with high out-of-band rejection. Brief Description of the Drawings
[0006] Figure 1 It is a module connection block diagram of the multi-way coupler suitable for a medium-wave receiver of the present invention; Figure 2Circuit schematic diagram of the coupling band-pass filter network of the multi-way coupler suitable for medium-wave receivers of the present invention; Figure 3 Band-pass filter response curve of the multi-way coupler suitable for medium-wave receivers of the present invention; Figure 4 Band-pass filter response curve of the multi-way coupler suitable for medium-wave receivers of the present invention; Label description: 1. Single-pole triple-throw switch; 2. Coupling band-pass filter network; 3. Single-pole double-throw switch; 4. Receiving antenna. Specific implementation mode
[0007] To describe the technical content, achieved objectives and effects of the present invention in detail, the following is described in conjunction with the implementation modes and with reference to the drawings.
[0008] Please refer to Figure 1 and Figure 2 , the technical solution adopted by the present invention is: A multi-way coupler suitable for medium-wave receivers includes a plurality of band-pass filter channels. Each of the band-pass filter channels includes a single-pole triple-throw switch, two coupling band-pass filter networks, and a single-pole double-throw switch. The input end of the single-pole triple-throw switch is electrically connected to the receiving antenna of the medium-wave receiver. The output ends of the single-pole triple-throw switch are respectively electrically connected to the input ends of the two coupling band-pass filter networks. The input ends of the single-pole double-throw switch are respectively electrically connected to the output ends of the two coupling band-pass filter networks.
[0009] It can be seen from the above description that the beneficial effects of the present invention are: The band-pass filter channels provided in this solution include a single-pole triple-throw switch, two coupling band-pass filter networks, and a single-pole double-throw switch. The use of the single-pole triple-throw switch array avoids the simultaneous access of the coupling band-pass filter networks of adjacent channels, which affects the filtering performance. Through the single-pole triple-throw switch, one of the two coupling band-pass filter networks of adjacent channels can be selected for access, so as to achieve the purpose that one receiving antenna can be connected to any one or more coupling band-pass filter networks, and further achieve the sharing of one receiving antenna by multiple band-pass filter channels, meeting the usage requirements of multiple narrow-band filters with high out-of-band rejection sharing one antenna.
[0010] Further, the coupling band-pass filter network includes five band-pass filter circuits electrically connected in sequence.
[0011] Further, the five band-pass filter circuits are respectively a first resonance unit, a second resonance unit, a third resonance unit, a fourth resonance unit, and a fifth resonance unit; One end of the first resonant unit is electrically connected to one end of the second resonant unit and the output end of the single-pole triple-throw switch respectively. The other end of the first resonant unit is electrically connected to one end of the third resonant unit and one end of the second resonant unit respectively, and the other end of the first resonant unit, one end of the third resonant unit and one end of the second resonant unit are all grounded. The other end of the second resonant unit is electrically connected to the other end of the third resonant unit and one end of the fourth resonant unit respectively. The other end of the fourth resonant unit is electrically connected to the other end of the fifth resonant unit.
[0012] As can be seen from the above description, it is achieved by changing the LC parameters of the first resonant unit of the coupled band-pass filter network, thereby completing reactance cancellation and wide-band impedance matching.
[0013] Further, the first resonant unit includes an inductor and a capacitor connected in parallel with each other. The second resonant unit includes an inductor and a capacitor connected in series with each other. The third resonant unit includes an inductor and a capacitor connected in parallel with each other. The fourth resonant unit includes an inductor and a capacitor connected in series with each other. The fifth resonant unit includes an inductor and a capacitor connected in parallel with each other.
[0014] Further, the inductance values of the inductors in the first resonant unit, the second resonant unit, the third resonant unit, the fourth resonant unit and the fifth resonant unit are all not equal. The capacitance values of the capacitors in the first resonant unit, the second resonant unit, the third resonant unit, the fourth resonant unit and the fifth resonant unit are all not equal.
[0015] Further, the number of the band-pass filter channels is four.
[0016] Further, the common end of the single-pole triple-throw switch is electrically connected to the receiving antenna of the medium-wave receiver. One switching end of the single-pole triple-throw switch is open. The remaining two switching ends of the single-pole triple-throw switch are connected to the input ends of two coupled band-pass filter networks in one-to-one correspondence.
[0017] Further, the model of the single-pole triple-throw switch is FM8638.
[0018] Further, the two switching ends of the single-pole double-throw switch are connected to the output ends of two coupled band-pass filter networks in one-to-one correspondence.
[0019] Further, the model of the single-pole double-throw switch is FW3101.
[0020] Please refer to Figures 1 to 4 As shown in the following, Embodiment 1 of the present invention is: Please refer to Figure 1, A multiplex coupler suitable for a medium-wave receiver, comprising a plurality of band-pass filtering channels. Each of the band-pass filtering channels includes a single-pole triple-throw switch 1, two coupled band-pass filtering networks 2, and a single-pole double-throw switch 3. The input end of the single-pole triple-throw switch 1 is electrically connected to the receiving antenna 4 of the medium-wave receiver. The output end of the single-pole triple-throw switch 1 is respectively electrically connected to the input ends of the two coupled band-pass filtering networks 2. The input ends of the single-pole double-throw switch 3 are respectively electrically connected to the output ends of the two coupled band-pass filtering networks 2.
[0021] Please refer to Figure 2 , The coupled band-pass filtering network 2 includes five band-pass filtering circuits electrically connected in sequence.
[0022] Please refer to Figure 2 , The five band-pass filtering circuits are respectively a first resonant unit, a second resonant unit, a third resonant unit, a fourth resonant unit, and a fifth resonant unit; One end of the first resonant unit is respectively electrically connected to one end of the second resonant unit and the output end of the single-pole triple-throw switch 1. The other end of the first resonant unit is respectively electrically connected to one end of the third resonant unit and one end of the second resonant unit, and the other end of the first resonant unit, one end of the third resonant unit, and one end of the second resonant unit are all grounded. The other end of the second resonant unit is respectively electrically connected to the other end of the third resonant unit and one end of the fourth resonant unit. The other end of the fourth resonant unit is electrically connected to the other end of the fifth resonant unit.
[0023] Please refer to Figure 2 , The first resonant unit includes an inductor and a capacitor connected in parallel with each other (such as inductor L1 and capacitor C1). The second resonant unit includes an inductor and a capacitor connected in series with each other (such as inductor L2 and capacitor C2). The third resonant unit includes an inductor and a capacitor connected in parallel with each other (such as inductor L3 and capacitor C3). The fourth resonant unit includes an inductor and a capacitor connected in series with each other (such as inductor L4 and capacitor C4). The fifth resonant unit includes an inductor and a capacitor connected in parallel with each other (such as inductor L5 and capacitor C5). The series resonant unit controls the frequency characteristics of the passband, while the parallel resonant unit adjusts the stopband characteristics, and the precise control of the frequency response of the passband filter is achieved through the combination of series and parallel.
[0024] The inductance values of the inductors in the first resonant unit, the second resonant unit, the third resonant unit, the fourth resonant unit, and the fifth resonant unit are all not equal. The capacitance values of the capacitors in the first resonant unit, the second resonant unit, the third resonant unit, the fourth resonant unit, and the fifth resonant unit are all not equal.
[0025] The number of the band-pass filtering channels is four.
[0026] The common terminal of the single-pole triple-throw switch 1 is electrically connected to the receiving antenna 4 of the medium-wave receiver. One switching terminal of the single-pole triple-throw switch 1 is open, and the remaining two switching terminals of the single-pole triple-throw switch 1 are respectively connected to the input ends of two coupled band-pass filter networks 2.
[0027] The model of the single-pole triple-throw switch 1 is FM8638.
[0028] The two switching terminals of the single-pole double-throw switch 3 are respectively connected to the output ends of two coupled band-pass filter networks 2.
[0029] The model of the single-pole double-throw switch 3 is FW3101.
[0030] The signals received by the medium-wave antenna are selected from one to four band-pass filter channels after being grouped by the single-pole triple-throw switch 1, and are connected to the reactance cancellation matching network in the form of star dots and then reach their respective filter channels, thus realizing multi-channel coupling.
[0031] The coupled band-pass filter network 2 set in this scheme divides the frequency band of 150 kHz - 650 kHz into eight segments, and realizes full frequency coverage through eight fifth-order LC filters. The frequency response characteristics of each filter channel are as Figure 3 and Figure 4 shown.
[0032] This scheme designs a total of eight narrow-band band-pass filters. To ensure the normal operation of each filter, the filters in adjacent passbands are prohibited from being accessed. Through the use of radio frequency switches, it is ensured that this design can realize the selection of the number of receiving channels of one channel, two channels, three channels and four channels, and each channel does not affect each other. The optimized design of the resonant unit of the band-pass filter realizes the purpose that eight filters can share one receiving antenna.
[0033] In summary, a multi-channel coupler suitable for a medium-wave receiver provided by the present invention. The band-pass filter channel includes a single-pole triple-throw switch, two coupled band-pass filter networks and a single-pole double-throw switch. The use of the single-pole triple-throw switch array avoids the simultaneous access of the coupled band-pass filter networks in adjacent channels, which affects the filtering performance. Through the single-pole triple-throw switch, one of the two coupled band-pass filter networks in adjacent channels can be selected to be accessed, so as to realize the purpose that one receiving antenna can be connected to any one or more coupled band-pass filter networks, and further realize that multiple band-pass filter channels share one receiving antenna, meeting the use requirements of multiple narrow-band filters with high out-of-band rejection sharing one antenna.
[0034] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical field, shall be equally included in the patent protection scope of the present invention.
Claims
1. A multi-way coupler suitable for a medium wave receiver, characterized in that: It comprises a plurality of bandpass filter channels, each of which comprises a single-pole three-throw switch, two coupled bandpass filter networks and a single-pole double-throw switch, the input end of the single-pole three-throw switch is electrically connected to the receiving antenna of the medium wave receiver, the output end of the single-pole three-throw switch is electrically connected to the input ends of the two coupled bandpass filter networks, and the input end of the single-pole double-throw switch is electrically connected to the output ends of the two coupled bandpass filter networks.
2. The multi-way coupler suitable for a medium wave receiver according to claim 1, characterized in that: The coupled bandpass filter network includes five bandpass filter circuits electrically connected in sequence.
3. The multi-way coupler suitable for a medium wave receiver according to claim 2, characterized in that: The five bandpass filter circuits are respectively a first resonance unit, a second resonance unit, a third resonance unit, a fourth resonance unit and a fifth resonance unit; One end of the first resonance unit is electrically connected to one end of the second resonance unit and the output end of the single-pole triple-throw switch, respectively; the other end of the first resonance unit is electrically connected to one end of the third resonance unit and one end of the second resonance unit, respectively; and the other end of the first resonance unit, one end of the third resonance unit and one end of the second resonance unit are all grounded; the other end of the second resonance unit is electrically connected to the other end of the third resonance unit and one end of the fourth resonance unit, respectively; and the other end of the fourth resonance unit is electrically connected to the other end of the fifth resonance unit.
4. The multi-way coupler suitable for a medium wave receiver according to claim 3, characterized in that: The first resonance unit includes an inductor and a capacitor connected in parallel, the second resonance unit includes an inductor and a capacitor connected in series, the third resonance unit includes an inductor and a capacitor connected in parallel, the fourth resonance unit includes an inductor and a capacitor connected in series, and the fifth resonance unit includes an inductor and a capacitor connected in parallel.
5. The multi-way coupler suitable for a medium wave receiver according to claim 4, characterized in that: The inductance values of the inductors in the first resonance unit, the second resonance unit, the third resonance unit, the fourth resonance unit and the fifth resonance unit are not equal, and the capacitance values of the capacitors in the first resonance unit, the second resonance unit, the third resonance unit, the fourth resonance unit and the fifth resonance unit are not equal.
6. The multi-way coupler suitable for a medium wave receiver according to claim 1, characterized in that: The number of the bandpass filter channels is four.
7. The multi-way coupler suitable for a medium wave receiver according to claim 1, characterized in that: The common end of the single-pole three-throw switch is electrically connected to the receiving antenna of the medium wave receiver, one switching end of the single-pole three-throw switch is open, and the other two switching ends of the single-pole three-throw switch are connected to the input ends of two coupled bandpass filter networks in a one-to-one correspondence.
8. The multi-way coupler suitable for a medium wave receiver according to claim 1, characterized in that: The model of the single-pole triple-throw switch is FM8638.
9. The multi-way coupler suitable for a medium wave receiver according to claim 1, characterized in that: The two switching ends of the single-pole double-throw switch are connected to the output ends of the two coupled bandpass filter networks in a one-to-one correspondence.
10. The multi-way coupler suitable for a medium wave receiver according to claim 1, characterized in that: The model of the single-pole double-throw switch is FW3101.