Analog antenna circuits, analog antennas, and test systems

Abstract

This invention discloses an analog antenna circuit, an analog antenna, and a testing system, relating to the field of testing technology. The analog antenna circuit includes a resistor network, an RC network, and multiple ports; wherein resistors in the resistor network, resistors in the RC network, and capacitors are selectively connected between the multiple ports to respectively constitute at least two of an AM single-signal analog antenna line, an AM dual-signal analog antenna line, an FM single-signal analog antenna line, and an FM dual-signal analog antenna line. Thus, multiple analog antenna lines are integrated into the same circuit, and different operating modes are switched through the selective connection of the resistor network and RC network, avoiding frequent antenna replacements, improving testing efficiency and accuracy, and reducing manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to an analog antenna circuit, an analog antenna, and a testing system. Background Technology

[0002] In testing AM (Amplitude Modulation) / FM (Frequency Modulation) car radios, the national standard specifies four standard analog antennas: AM single signal (0dB), AM dual signal (-6dB), FM single signal (0dB), and FM dual signal (-6dB). Different test items require changing the corresponding standard analog antenna. However, this frequent switching has two problems: firstly, it reduces testing efficiency; secondly, except for the FM single signal antenna, the other three types of antennas are directional, and the input and output ports cannot be reversed. Frequent switching can easily lead to incorrect test results due to reversed connections, increasing the risk of erroneous test data. Summary of the Invention

[0003] The purpose of this invention is to provide an analog antenna circuit, an analog antenna, and a testing system to avoid frequent antenna replacements, improve testing efficiency and accuracy, and reduce manufacturing costs.

[0004] In a first aspect, embodiments of the present invention provide an analog antenna circuit, comprising: a resistor network, an RC network, and a plurality of ports; wherein, the resistors in the resistor network, the resistors in the RC network, and the capacitors are selectively connected between the plurality of ports to respectively constitute at least two of an AM single-signal analog antenna line, an AM dual-signal analog antenna line, an FM single-signal analog antenna line, and an FM dual-signal analog antenna line.

[0005] In some embodiments, the plurality of ports includes a first port and a second port; wherein, in the FM single-signal analog antenna line, the first port is connected to a first end of the resistor network, and the second port is connected to a second end of the resistor network; in the AM single-signal analog antenna line, the first port is connected to a first end of the RC network, and the second port is connected to a second end of the RC network.

[0006] In some embodiments, the plurality of ports further includes a third port; wherein, in the FM dual-signal analog antenna line, the first port is connected to the third end of the resistor network, the third port is connected to the fourth end of the resistor network, and the second port is connected to the second end of the resistor network; in the AM dual-signal analog antenna line, the first port is connected to the third end of the RC network, the third port is connected to the fourth end of the RC network, and the second port is connected to the second end of the RC network.

[0007] In some embodiments, the resistor network includes a first resistor, a second resistor, a third resistor, and a fourth resistor; wherein, a first end of the first resistor serves as a first end of the resistor network, a second end of the first resistor is connected to a first end of the fourth resistor and serves as a second end of the resistor network; a first end of the second resistor serves as a third end of the resistor network, a first end of the third resistor serves as a fourth end of the resistor network, and a second end of the second resistor is connected to a second end of both the third resistor and the fourth resistor.

[0008] In some embodiments, the RC network includes a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, and a first reference ground; wherein, the first end of the fifth resistor serves as the third end of the RC network, the first end of the sixth resistor serves as the first end of the RC network, the first end of the seventh resistor serves as the fourth end of the RC network, the second end of the fifth resistor is connected to the second end of the sixth resistor, the second end of the seventh resistor, and the first end of the first capacitor, the second end of the first capacitor is connected to the first end of the second capacitor and serves as the second end of the RC network, and the second end of the second capacitor is connected to the first reference ground.

[0009] In some embodiments, the analog antenna circuit further includes a second reference ground; wherein, in the FM single-signal analog antenna line or the AM single-signal analog antenna line, the third port is connected to the second reference ground.

[0010] Secondly, embodiments of the present invention provide an analog antenna, comprising: a housing, multiple connectors, multiple switches, and the analog antenna circuit described in the first aspect embodiment; wherein, the housing has multiple sliding grooves, each corresponding to one of the multiple switches, and each switch is slidably disposed within a corresponding sliding groove; the multiple connectors are disposed on the housing and are connected one-to-one to multiple ports in the analog antenna circuit; the analog antenna circuit is disposed within the housing; the multiple switches are used to selectively connect resistors in the resistor network, resistors in the RC network, and capacitors in the analog antenna circuit between the multiple connectors.

[0011] In some embodiments, the resistor network and the RC network are disposed on a printed circuit board, which has multiple sets of pad pairs corresponding one-to-one with the multiple ports. The first pad in each pad pair is connected to the corresponding port, and the second pad in each pad pair is connected to the corresponding connection terminal of the resistor network or the RC network. The housing has multiple locking cutouts corresponding to each slide cutout, and the position of each locking cutout corresponds to one of the pad pairs in a set of pad pairs. The switch includes a first structural component, a second structural component, and a third structural component. The first structural component is disposed outside the housing and is used to receive external force to move the switch within the slide cutout and the locking cutout. The second structural component is connected between the first structural component and the third structural component. The third structural component is disposed inside the housing and is used to contact and connect the corresponding pad pair when the switch is locked in the locking cutout.

[0012] In some embodiments, at least a portion of the connector is disposed within the housing and is provided with metal pins for connecting to corresponding ports; at least a portion of the connector is disposed outside the housing for connecting to external devices.

[0013] Thirdly, embodiments of the present invention provide a testing system, including: a signal generator for generating test signals; The device under test; and the analog antenna described in the second aspect embodiment; wherein a plurality of connectors in the analog antenna are respectively connected to the signal generator and the device under test.

[0014] The analog antenna circuit, analog antenna, and test system of this invention include a resistor network, an RC network, and multiple ports. The resistors in the resistor network and the resistors and capacitors in the RC network are selectively connected between the multiple ports to form at least two of an AM single-signal analog antenna line, an AM dual-signal analog antenna line, an FM single-signal analog antenna line, and an FM dual-signal analog antenna line. Therefore, by integrating multiple analog antenna lines into the same circuit and achieving switching between different operating modes through the selective connection of the resistor network and RC network, frequent antenna replacements can be avoided, improving test efficiency and accuracy while reducing manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an analog antenna circuit according to an embodiment of the present invention; Figure 2 This is a schematic diagram of an analog antenna circuit according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of an analog antenna circuit according to another specific embodiment of the present invention; Figure 4This is a schematic diagram of an analog antenna circuit according to another specific embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of an analog antenna according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a switch according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a switch switching label according to an embodiment of the present invention; Figure 8 This is a structural block diagram of the testing system according to an embodiment of the present invention. Detailed Implementation

[0016] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0017] The analog antenna circuit, analog antenna, and test system of embodiments of the present invention are described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of an analog antenna circuit according to an embodiment of the present invention.

[0019] like Figure 1 As shown, the analog antenna circuit 10 includes a resistor network 11, an RC network 12, and multiple ports 13.

[0020] The resistors in resistor network 11, resistors in RC network 12, and capacitors are selectively connected between multiple ports 13 to form at least two of AM single-signal analog antenna lines, AM dual-signal analog antenna lines, FM single-signal analog antenna lines, and FM dual-signal analog antenna lines, respectively.

[0021] In this embodiment, the resistor network 11 consists of multiple resistive elements, used to achieve impedance matching and signal attenuation in the FM band; the RC network 12 consists of multiple resistors and capacitors, used to achieve impedance matching and signal attenuation in the AM band. Multiple ports 13 include input and output terminals, used to connect to a signal generator and the device under test.

[0022] Specifically, when the resistors in resistor network 11 are selectively connected between ports 13, the circuit can form an FM single-signal analog antenna line or an FM dual-signal analog antenna line. The FM single-signal analog antenna line provides 0dB attenuation for test scenarios with a single FM signal input; the FM dual-signal analog antenna line provides -6dB attenuation for test scenarios with two FM signals input simultaneously.

[0023] When the resistors and capacitors in RC network 12 are selectively connected between ports 13, the circuit can form an AM single-signal analog antenna line or an AM dual-signal analog antenna line. The AM single-signal analog antenna line provides 0dB attenuation for test scenarios with a single AM ​​signal input; the AM dual-signal analog antenna line provides -6dB attenuation for test scenarios with two AM signals input simultaneously.

[0024] Through the above selective connection, the analog antenna circuit 10 can flexibly switch working modes according to different test requirements without changing the hardware.

[0025] Therefore, the analog antenna circuit 10 integrates analog antenna lines such as AM single signal, AM dual signal, FM single signal and FM dual signal into the same circuit, and uses the selective connection of resistor network and RC network to realize flexible switching of different working modes. While ensuring the directional requirements of each line, it avoids the problems of low test efficiency and easy error caused by frequent antenna replacement, and at the same time reduces manufacturing cost, and has high practical value.

[0026] In some embodiments of the present invention, such as Figure 2 As shown, the multiple ports 13 include a first port Port1 and a second port Port2. In the FM single-signal analog antenna circuit, the first port Port1 is connected to the first end of the resistor network 11, and the second port Port2 is connected to the second end of the resistor network 11; in the AM single-signal analog antenna circuit, the first port Port1 is connected to the first end of the RC network 12, and the second port Port2 is connected to the second end of the RC network 12.

[0027] This implementation method is suitable for test scenarios that require a single signal input (including AM single signal and FM single signal). It has a simple circuit structure, short signal transmission path, and low loss.

[0028] In other embodiments of the invention, such as Figure 3 As shown, the multiple ports 13 also include a third port Port3. In the FM dual-signal analog antenna circuit, the first port Port1 is connected to the third end of the resistor network 11, the third port Port3 is connected to the fourth end of the resistor network 11, and the second port Port2 is connected to the second end of the resistor network 11; in the AM dual-signal analog antenna circuit, the first port Port1 is connected to the third end of the RC network 12, the third port Port3 is connected to the fourth end of the RC network 12, and the second port Port2 is connected to the second end of the RC network 12.

[0029] In the implementation method Figure 2The implementation shown adds a third port, Port3, and expands the single-signal line into a dual-signal line. Specifically, Figure 2 The implementation shown requires only two ports to achieve both AM single-signal and FM single-signal operating modes, while Figure 3 The illustrated implementation introduces a third port, Port3, to support the input and output of two differential signals, thus enabling both AM and FM dual-signal operating modes. Both implementations share the same resistor network 11 and RC network 12, and through different port connection configurations, achieve functional expansion from single-signal to dual-signal, meeting the needs of complex testing scenarios with multiple signal inputs.

[0030] In other embodiments of the present invention, the first port Port1, the second port Port2, the third port Port3, the resistor network 11, and the RC network 12 may also be configured to implement one or a combination of AM single signal, AM dual signal, FM single signal, and FM dual signal.

[0031] See in some examples Figure 3 The resistor network 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. Specifically, the first end of the first resistor R1 serves as the first end of the resistor network 11, and the second end of the first resistor R1 is connected to the first end of the fourth resistor R4, serving as the second end of the resistor network 11. The first end of the second resistor R2 serves as the third end of the resistor network 11, and the first end of the third resistor R3 serves as the fourth end of the resistor network 11. The second end of the second resistor R2 is connected to the second ends of both the third resistor R3 and the fourth resistor R4.

[0032] In this example, the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 can be 25Ω, 17Ω, 17Ω, and 42Ω, respectively. These resistance values ​​are optimized to enable the resistor network 11 to achieve precise impedance matching and signal attenuation in the FM band. Specifically, when the resistor network 11 is used in an FM single-signal analog antenna circuit, the first port Port1 is connected to the first end of the first resistor R1, and the second port Port2 is connected to the second end of the resistor network 11 (i.e., the connection point between the first resistor R1 and the fourth resistor R4). The signal is transmitted through the path formed by the first resistor R1, achieving 0dB attenuation. When used in an FM dual-signal analog antenna circuit, the first port Port1 is connected to the first end of the second resistor R2, the third port Port3 is connected to the first end of the third resistor R3, and the second port Port2 is connected to the second end of the resistor network 11. The two differential signals are transmitted through the second resistor R2 and the third resistor R3 respectively, and then combined at the fourth resistor R4, achieving -6dB attenuation.

[0033] By configuring the resistor network to 25Ω, 17Ω, 17Ω, and 42Ω, precise impedance matching (50Ω system) and attenuation control (0dB for single signal, -6dB for dual signal) in the FM band are achieved. Furthermore, this design has fewer components, lower cost, better symmetry, ensures the transmission quality of differential signals, meets national standard testing requirements, and is easy to manufacture and debug.

[0034] In some examples, the RC network 12 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, and a first reference ground GND1. Specifically, the first terminal of the fifth resistor R5 serves as the third terminal of the RC network 12, the first terminal of the sixth resistor R6 serves as the first terminal of the RC network 12, and the first terminal of the seventh resistor R7 serves as the fourth terminal of the RC network 12. The second terminal of the fifth resistor R5 is connected to the second terminals of the sixth resistor R6, the seventh resistor R7, and the first terminal of the first capacitor C1. The second terminal of the first capacitor C1 is connected to the first terminal of the second capacitor C2 and serves as the second terminal of the RC network 12. The second terminal of the second capacitor C2 is connected to the first reference ground GND1.

[0035] In this example, the resistance values ​​of the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 can be 110Ω, 30Ω, and 110Ω, respectively. The capacitance value of the first capacitor C1 is 15pF, and the capacitance value of the second capacitor C2 is 65pF. These parameters are optimized to enable the RC network 12 to achieve precise impedance matching and signal attenuation in the AM band. Specifically, when the RC network 12 is used in an AM single-signal analog antenna circuit, the first end of the sixth resistor R6 (the first end of the RC network 12) is connected to the first port Port1, and the second end of the RC network 12 (the connection point between the first capacitor C1 and the second capacitor C2) is connected to the second port Port2. The signal is transmitted through the RC filter path formed by the sixth resistor R6 (30Ω), the first capacitor C1 (15pF), and the second capacitor C2 (65pF), achieving 0dB attenuation of the signal. When used in an AM dual-signal analog antenna circuit, the first terminal of the fifth resistor R5 is connected to the first port Port1, the first terminal of the seventh resistor R7 is connected to the third port Port3, and the second terminal of the RC network 12 is connected to the second port Port2. The two differential signals are transmitted through the fifth resistor R5 (110Ω) and the seventh resistor R7 (110Ω) respectively, and are output after being filtered by the first capacitor C1 (15pF) and the second capacitor C2 (65pF), achieving a -6dB attenuation of the signal. The first reference ground GND1 provides a common ground reference for the circuit, ensuring the integrity of the signal loop.

[0036] The selection of the above resistance and capacitance values ​​takes into account the impedance matching and filtering characteristics requirements of the AM band. The sixth resistor R6 uses a smaller 30Ω to reduce the insertion loss in single-signal mode, while the fifth resistor R5 and the seventh resistor R7 use symmetrical 110Ω to ensure differential balance in dual-signal mode. At the same time, the combination of 15pF and 65pF capacitors forms an appropriate low-pass filtering characteristic, effectively suppressing high-frequency interference outside the AM band.

[0037] In some embodiments of the present invention, such as Figure 4 As shown, the analog antenna circuit 10 also includes a second reference ground GND2. In the FM single-signal analog antenna line or the AM single-signal analog antenna line, the third port Port3 is connected to the second reference ground GND2.

[0038] Specifically, the second reference ground GND2 can be set in resistor network 11 or RC network 12; the specific location can be flexibly selected according to the PCB layout and grounding design. See also Figure 3 , Figure 4 When integrating single-signal and dual-signal analog antennas into the same circuit, in a single-signal analog antenna scheme (AM single-signal or FM single-signal), the third port (Port3) has no signal input and is not needed. In this case, the third port (Port3) can be left floating or grounded.

[0039] Compared to the floating scheme, the grounding scheme of this embodiment can increase the anti-interference function: the potential interference signal introduced by the third port Port3 is directly guided to the second reference ground GND2, which can prevent the interference signal from coupling into the signal path of the first port Port1 and the second port Port2, thus ensuring the purity of the test signal and the accuracy of the test results.

[0040] The following is combined with Figure 4 The illustrated embodiment describes the working principle of the analog antenna circuit of the present invention.

[0041] See Figure 4 The analog antenna circuit 10 includes three ports 13 (Port1, Port2, and Port3) and multiple contacts (numbered 1 to 9, which can be used to connect to different terminals of the resistor network 11 and the RC network 12). By switching the three ports 13 to different contact positions, four analog antenna schemes can be implemented respectively: AM single-signal standard analog antenna (0dB attenuation): Port1 connects to contact 4, Port2 connects to contact 9, Port3 connects to contact 7; AM Dual-Signal Standard Analog Antenna (-6dB Attenuation): Port1 connects to contact 3, Port2 connects to contact 9, Port3 connects to contact 6; FM single-signal standard analog antenna (0dB attenuation): Port1 connects to contact 1, Port2 connects to contact 8, Port3 connects to contact 7; FM dual-signal standard analog antenna (-6dB attenuation): Port1 connects to contact 2, Port2 connects to contact 8, and Port3 connects to contact 5.

[0042] The correspondence between the above four schemes and the switch contact positions is summarized in Table 1 below.

[0043] Table 1

[0044] Figure 5 This is a schematic diagram of the structure of an analog antenna according to an embodiment of the present invention.

[0045] like Figure 5 As shown, the analog antenna 100 includes: a housing 20, a plurality of connectors 30, a plurality of switches 40, and the analog antenna circuit 10 of the above embodiment (specific connections not shown).

[0046] The housing 20 has multiple sliding grooves 21, each corresponding to a multiple switch 40. Each switch 40 is slidably disposed within the corresponding sliding groove 21. Multiple connectors 30 are disposed on the housing 20 and are connected to multiple ports 13 in the analog antenna circuit 10. The analog antenna circuit 10 is disposed inside the housing 20. The multiple switches 40 are used to selectively connect the resistors in the resistor network 11, the resistors in the RC network 12, and the capacitors in the analog antenna circuit 10 between the multiple connectors 30.

[0047] In this embodiment, the housing 20 may be made of a metal material (such as aluminum) to shield external electromagnetic interference and provide mechanical protection for the internal circuitry. Slide cutouts 21 extend along the surface of the housing 20, with each cutout corresponding to a switch 40. The switch 40 can slide to different positions within the slide cutouts 21, each position corresponding to a standard analog antenna operating mode (such as AM single signal, AM dual signal, FM single signal, FM dual signal).

[0048] The connector 30 can be a coaxial connector with an internal hole and external thread (such as a BNC, N-type or SMA connector), one end of which is connected (e.g., welded) to the corresponding port connection terminal in the analog antenna circuit 10, and the other end extends out of the housing 20 for connecting to a signal generator or device under test.

[0049] The switch 40 includes a sliding part and a contact part. When the user pushes the switch 40 to a certain position along the slide rail, the contact part of the switch 40 contacts and connects with a corresponding pair of connection terminals in the analog antenna circuit 10, thereby connecting the corresponding resistor or capacitor between the corresponding connectors 30 to realize the configuration of a specific analog antenna circuit. Different positions correspond to different connection terminal pairs, thereby realizing the switching of different operating modes.

[0050] With the above structure, users can quickly switch between different standard analog antennas simply by sliding switch 40 without disassembling or replacing any parts, making the operation simple and quick.

[0051] In some implementations, such as Figure 5 As shown, resistor network 11 and RC network 12 are disposed on PCB (Printed Circuit Board). The printed circuit board is provided with multiple sets of pad pairs, which correspond one-to-one with multiple ports 13. The first pad in each pad pair is connected to the corresponding port 13, and the second pad in each pad pair is connected to the corresponding connection terminal of resistor network 11 or RC network 12.

[0052] Specifically, the PCB serves as the carrier of the analog antenna circuit 10. The resistors and capacitors in the resistor network 11 and RC network 12 are soldered onto the PCB via surface mount or through-hole mounting. Multiple sets of pad pairs are also arranged on the PCB. Each pad pair includes two mutually insulated pads (first pad and second pad), which are electrically disconnected under normal conditions. The first pad is connected to the corresponding port 13 (such as first port Port1, second port Port2, or third port Port3) via conductive traces on the PCB; the second pad is connected to the corresponding connection terminal of the resistor network 11 or RC network 12 (such as the first terminal or second terminal of the resistor network, or the third terminal or fourth terminal of the RC network, etc.) via conductive traces on the PCB.

[0053] When external switching elements (such as Figure 5 When the conductive contact of the switch 40 in the circuit simultaneously contacts the first pad and the second pad, the pad pair is electrically connected, thereby connecting the corresponding port 13 to the corresponding connection terminal of the resistor network 11 or the RC network 12. By controlling the on / off state of different pad pairs, the connection relationship between port 13 and the resistor network 11 or the RC network 12 can be selectively configured, thereby forming different analog antenna lines (such as AM single signal, AM dual signal, FM single signal, FM dual signal).

[0054] By integrating resistor network 11, RC network 12, and pad pairs onto the same PCB, the design achieves a compact structure and ease of manufacturing. The pad pairs are normally insulated from each other, preventing signal crosstalk. This design is low-cost, highly reliable, and easily scalable and mass-produced.

[0055] See in some examples Figure 5 The housing 20 has multiple locking holes 22 corresponding to each slide hole 21, and the position of each locking hole 22 corresponds to one of the pads in a set of pad pairs.

[0056] Specifically, the slide groove 21 on the housing 20 can be an elongated opening, within which the switch 40 slides in a predetermined direction. Along the side of the slide groove 21, the housing 20 has multiple locking grooves 22 (such as the four locking positions corresponding to the first port Port1, corresponding to AM single signal, AM dual signal, FM single signal, and FM dual signal, respectively). The vertical projection position of each locking groove 22 on the PCB coincides exactly with a specific pad pair in a set of pad pairs. Multiple sets of pad pairs arranged on the PCB are arranged with the same spacing and order as the locking grooves 22, forming a "position-pad" mapping relationship corresponding to the switch's sliding path.

[0057] When the user pushes the switch 40 to slide it along the first direction within the slide cutout 21, the conductive contact at the bottom of the switch 40 moves above the PCB surface. When the switch 40 slides to a predetermined position within the slide cutout 21, the user can move the switch 40 along the second direction (e.g., at a 90° angle to the first direction) into the corresponding locking cutout 22. At this point, the switch 40 generates a clear positioning feel and locks in that position. Simultaneously, the conductive contact at the bottom of the switch 40 contacts and electrically connects the first and second pads in the corresponding set of pads, thereby connecting the corresponding port 13 to the corresponding connection terminal of the resistor network 11 or RC network 12.

[0058] Through the one-to-one correspondence design described above, each locked position of switch 40 uniquely corresponds to a set of pad pairs, thus uniquely corresponding to a single analog antenna operating mode. Users do not need to remember complex contact numbers or connection relationships; they only need to slide the switch to the corresponding marked position to complete the mode switching.

[0059] In some examples, such as Figure 6 As shown, the switch 40 includes a first structural member 41, a second structural member 42, and a third structural member 43. The first structural member 41 is disposed outside the housing 20 and is used to receive external force to move the switch 40 within the slide cutout 21 and the locking cutout 22. The second structural member 22 is connected between the first structural member 21 and the third structural member 23. The third structural member 23 is disposed inside the housing 20 and is used to contact and connect the corresponding pad pair when the switch 20 is locked in the locking cutout 22.

[0060] Specifically, see Figure 6The first structural component 41 is the top operating part of the switch 40, which can be made of conductive material (such as aluminum). Its size is larger than the width of the slide cutout 21 to prevent the switch 40 from falling off. The first structural component 41 mainly serves to increase the contact point, making the switch easier to apply force and slide. Its surface can be provided with anti-slip texture to facilitate the user to apply pushing force. The second structural component 42 is the middle connecting part of the switch 40, which is made of insulating material (such as thermosetting plastic). One end is fixedly connected to the first structural component 41, and the other end is fixedly connected to the third structural component 43. The second structural component 42 can have a certain degree of elasticity. When the switch 40 slides to the locking cutout 22 position, the second structural component 42 undergoes elastic deformation and gets stuck in the locking cutout 22, producing a clear positioning feeling and locking the switch 40 in that position. The third structural component 43 is the bottom contact part of the switch 40, which is made of conductive material (such as tin). Its shape and size match the pads on the PCB and can be manufactured with reference to the package of the reserved pads on the PCB. When switch 40 is locked in locking cutout 22, third structural component 43 simultaneously contacts and electrically connects the first and second pads in the corresponding pad pair, thereby connecting the corresponding port to the corresponding connection terminal of resistor network 11 or RC network 12.

[0061] When the user needs to switch working modes, firstly, push the first structural component 41 in the opposite direction of the second direction to disengage the second structural component 42 from the current locking slot 22. Then, push the first structural component 41 in the first direction or its opposite direction to slide the switch 40 to the target position within the slide slot 21. Next, push the first structural component 41 in the second direction to engage the second structural component 42 into the new locking slot 22. At this time, the third structural component 43 moves to the corresponding pad pair position, completing the electrical connection switch.

[0062] The switch 40 employs a three-layer structure: the first structural component receives external force, the second structural component (insulation) enables connection and locking, and the third structural component (conductivity) connects the pads. Insulation prevents signal crosstalk, elastic locking provides a clear positioning feel and prevents accidental activation, and conductive contact is reliable. It is easy to operate, has a clear structure, and ensures accurate and stable mode switching.

[0063] In some embodiments, at least a portion of the connector 30 is disposed within the housing 20 and is provided with a metal pin 31 for connecting to a corresponding port 13; at least a portion of the connector 30 is disposed outside the housing 20 for connecting to an external device.

[0064] Specifically, the connector 30 can be an internally threaded coaxial connector, including but not limited to BNC (Bayonet Neill-Concelman, snap-fit ​​coaxial connector), N-type connector, or SMA (Subminiature version A, ultra-miniature version A coaxial connector) connector. The connector 30 penetrates the side wall or end face of the housing 20 and is fixed to the housing 20 by threads or snap-fit. A metal pin 31 is provided on the rear side of the connector 30 (the part located inside the housing 20), which can be connected to the corresponding port 13 on the printed circuit board by soldering, thereby realizing the electrical connection between the connector 30 and the analog antenna circuit 10. The front side of the connector 30 (the part located outside the housing 20) is a standard coaxial interface for connecting external devices, such as signal generators (AM / FM signal sources) or devices under test (such as car radios).

[0065] See Figure 5 The multiple connectors 30 include a first connector, a second connector, and a third connector. The first and second connectors are used to connect to a signal generator to receive test signals; the third connector is used to connect to the device under test (DUT) and output the signal processed by the analog antenna circuit 10 to the DUT. The metal pins 31 of each connector 30 are soldered one-to-one with the corresponding ports 13 (such as Port1, Port2, and Port3) on the printed circuit board, ensuring the integrity and consistency of the signal transmission path.

[0066] For example, a sealing ring or gasket may be provided between the connector 30 and the housing 20 to prevent contaminants such as dust and moisture from entering the interior of the housing 20, thus protecting the analog antenna circuit 10 from environmental influences. The exposed portion of the connector 30 may also be equipped with a dust cover to cover the interface when not in use, further extending its service life.

[0067] The connector 30 adopts a standard coaxial interface and is directly soldered to the PCB via metal pins 31, ensuring a continuous and reliable signal transmission path. The connector 30 penetrates the housing and is fixed in place, providing good vibration resistance and preventing loosening even with frequent insertion and removal. It is equipped with a sealing ring and dust cover, offering excellent protection. It is compatible with standard interfaces such as BNC / N / SMA, providing strong versatility. The input and output functions are clearly assigned, meeting antenna directivity requirements.

[0068] In some examples, such as Figure 7 As shown, to avoid users frequently consulting Table 1 to determine the correspondence between the position of switch 40 and the working mode during use, a mode identification area can be provided next to the slide cutout 21 of the housing 20. This identification area corresponds to the position of each locking cutout 22 and is labeled with the corresponding standard analog antenna scheme name (such as "AM single", "AM dual", "FM single", "FM dual").

[0069] With this intuitive label design, users don't need to consult external tables or memorize complex correspondences. They can simply slide the switch to the corresponding label position according to their testing needs to switch modes. This not only optimizes usability and improves operational efficiency but also avoids mode switching errors caused by misremembering or misreading tables, further enhancing testing accuracy.

[0070] Additionally, it should be noted that, Figure 5 The structure shown is exemplary and does not limit the scope of protection of this invention. Specifically, the shape of the housing 20 can be a cube, cuboid, cylinder, trapezoid, or other irregular shape, depending on factors such as the internal circuit board size, the number of switches, and the layout of connectors. The switches 40 can be arranged on the same side of the housing (e.g., ...). Figure 5 The top surface shown can be used, or the switches can be distributed across multiple different surfaces (e.g., some switches on the top surface and some on the sides) to facilitate operation from different angles and adapt to different test surfaces and usage habits. Connectors 30 can be concentrated on one surface, or distributed across multiple surfaces (e.g., depending on internal circuit routing, port function division, and ease of external device connection) to facilitate operation from different angles and adapt to different test surfaces and usage habits. Figure 5 The input connector is located on one side, and the output connector is located on the opposite side.

[0071] All the above-mentioned variations are based on the same technical principle and can achieve the same technical effect. They should all be regarded as implementation methods covered by this invention.

[0072] Figure 8 This is a structural block diagram of the testing system according to an embodiment of the present invention.

[0073] like Figure 8 As shown, the test system 1000 includes: a signal generator 200, a device under test 200, and a simulated antenna 100 as described in the above embodiment.

[0074] The signal generator 200 is used to generate test signals; the device under test 300 can be a car radio or a car audio-visual system; and multiple connectors 30 in the analog antenna 100 are respectively connected to the signal generator 200 and the device under test 300.

[0075] Specifically, signal generator 200 is an AM / FM signal generator capable of producing standard modulation signals (such as AM amplitude modulation signals or FM frequency modulation signals), and the output frequency and amplitude can be adjusted according to test requirements. Device under test 300 is a vehicle-mounted AM / FM receiver, whose input is used to receive the signal output from analog antenna 100 (used to simulate the original vehicle antenna load and to match the impedance characteristics of the signal generator), and demodulates and processes it through internal circuitry, finally outputting an audio signal for test analysis.

[0076] For example, the analog antenna 100 may include three connectors: a first connector, a second connector, and a third connector. The first connector and the second connector are respectively connected to two output channels of the signal generator 200 for receiving test signals generated by the signal generator 200; the third connector is connected to the antenna input terminal of the device under test 300 for outputting the signal processed by the analog antenna 100 to the device under test 300.

[0077] During testing, signal generator 200 generates an AM or FM test signal of a specified frequency and amplitude, which is transmitted via coaxial cable to the input port of analog antenna 100. Analog antenna 100, based on the current position of switch 40 (i.e., the selected operating mode), performs appropriate impedance matching and attenuation processing (0dB or -6dB) on the test signal, and then transmits it to device under test 300 through its output port. After receiving the signal, device under test 300 processes it through its internal circuitry. Testers can determine whether the performance of device under test 300 meets the standards by analyzing its output (such as audio quality, signal-to-noise ratio, sensitivity, etc.).

[0078] With the aforementioned test system 1000, users can quickly switch the working mode of the analog antenna 100 to complete the test items corresponding to the four standard analog antennas: AM single signal, AM dual signal, FM single signal, and FM dual signal, without changing the hardware equipment, which greatly simplifies the test process.

[0079] In summary, the analog antenna circuit, analog antenna, and testing system of the present invention can achieve the following beneficial effects: 1) Reduced cost: Integrating four analog antennas onto the same PCB board saves on materials such as PCB board and metal casing; 2) Improved efficiency: Users can quickly switch working modes simply by sliding a switch, without having to frequently replace antenna hardware; 3) Ensure accuracy: The analog antenna has a fixed signal path and directional design, which avoids test errors caused by reversed port connections.

[0080] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0085] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An analog antenna circuit, characterized in that, include: Resistor networks, RC networks, and multiple ports; The resistors in the resistor network, the resistors in the RC network, and the capacitors are selectively connected between the plurality of ports to form at least two of the AM single-signal analog antenna line, AM dual-signal analog antenna line, FM single-signal analog antenna line, and FM dual-signal analog antenna line, respectively.

2. The analog antenna circuit according to claim 1, characterized in that, The plurality of ports includes a first port and a second port; wherein... In the FM single-signal analog antenna line, the first port is connected to the first end of the resistor network, and the second port is connected to the second end of the resistor network; In the AM single-signal analog antenna line, the first port is connected to the first end of the RC network, and the second port is connected to the second end of the RC network.

3. The analog antenna circuit according to claim 2, characterized in that, The plurality of ports also includes a third port; wherein... In the FM dual-signal analog antenna circuit, the first port is connected to the third end of the resistor network, the third port is connected to the fourth end of the resistor network, and the second port is connected to the second end of the resistor network. In the AM dual-signal analog antenna circuit, the first port is connected to the third end of the RC network, the third port is connected to the fourth end of the RC network, and the second port is connected to the second end of the RC network.

4. The analog antenna circuit according to claim 3, characterized in that, The resistor network includes a first resistor, a second resistor, a third resistor, and a fourth resistor; wherein, The first end of the first resistor serves as the first end of the resistor network, and the second end of the first resistor is connected to the first end of the fourth resistor and serves as the second end of the resistor network; the first end of the second resistor serves as the third end of the resistor network, the first end of the third resistor serves as the fourth end of the resistor network, and the second end of the second resistor is connected to the second ends of the third resistor and the second ends of the fourth resistor, respectively.

5. The analog antenna circuit according to claim 3, characterized in that, The RC network includes a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, and a first reference ground; Wherein, the first end of the fifth resistor serves as the third end of the RC network, the first end of the sixth resistor serves as the first end of the RC network, the first end of the seventh resistor serves as the fourth end of the RC network, the second end of the fifth resistor is connected to the second end of the sixth resistor, the second end of the seventh resistor, and the first end of the first capacitor, respectively, the second end of the first capacitor is connected to the first end of the second capacitor and serves as the second end of the RC network, and the second end of the second capacitor is connected to the first reference ground.

6. The analog antenna circuit according to claim 3, characterized in that, The analog antenna circuit also includes a second reference ground; wherein... In the FM single-signal analog antenna line or the AM single-signal analog antenna line, the third port is connected to the second reference ground.

7. An analog antenna, characterized in that, include: The enclosure, multiple connectors, multiple switches, and an analog antenna circuit as described in any one of claims 1 to 6; wherein, The housing has multiple sliding grooves, each corresponding to one of the multiple switches, and each switch is slidably disposed in the corresponding sliding groove. The plurality of connectors are disposed on the housing and are connected one-to-one with the plurality of ports in the analog antenna circuit; The analog antenna circuit is housed within the housing. The plurality of switches are used to selectively connect the resistors in the resistor network, the resistors in the RC network, and the capacitors in the analog antenna circuit between the plurality of connectors.

8. The analog antenna according to claim 7, characterized in that, The resistor network and the RC network are disposed on a printed circuit board. The printed circuit board is provided with multiple sets of pad pairs, which correspond one-to-one with the multiple ports. The first pad in each pad pair is connected to the corresponding port, and the second pad in each pad pair is connected to the corresponding connection terminal of the resistor network or the RC network. The housing has multiple locking cutouts corresponding to each of the slide rail cutouts, and the position of each locking cutout corresponds to one of the pads in a set of pad pairs. The switch includes a first structural component, a second structural component, and a third structural component. The first structural component is disposed outside the housing and is used to receive external force to move the switch within the slide groove and the locking groove. The second structural component is connected between the first structural component and the third structural component; the third structural component is disposed inside the housing and is used to contact and connect the corresponding pad pair when the switch is locked in the locking cutout.

9. The analog antenna according to claim 7, characterized in that, At least a portion of the connector is disposed within the housing and is provided with metal pins for connecting to corresponding ports; At least a portion of the connector is disposed outside the housing for connecting external devices.

10. A testing system, characterized in that, include: A signal generator is used to generate test signals; Device under test; as well as The analog antenna as described in any one of claims 7 to 9; The analog antenna has multiple connectors that are respectively connected to the signal generator and the device under test.

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