L-band up-conversion assembly
By designing multi-stage filtering and mixing circuits, the spurious and harmonic suppression capabilities of the L-band upconverter components have been improved, overcoming the performance bottleneck in existing technologies and achieving the reliability and signal quality requirements for high-end applications.
Patent Information
- Application Number
- CN202522213218.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-10-20
AI Technical Summary
Existing L-band upconversion technology has insufficient spurious and harmonic suppression capabilities and serious local oscillator leakage, making it difficult to meet the stringent requirements of high-end applications such as satellite communications.
The design employs a multi-stage filtering and mixing circuit, including an input matching and filtering network, a multi-stage mixing circuit, and an output control circuit. Combined with a high-performance filter and amplifier, it improves spurious rejection to -50dBm and harmonic rejection to 12dBc. Furthermore, it effectively suppresses local oscillator leakage through couplers and detector circuits.
It achieves wideband processing, spurious suppression reaches -50dBm, harmonic suppression is improved to 12dBc, eliminates receiver interference risk, meets the self-test output requirements of satellite communication environment, and improves system reliability and signal quality.
Smart Images
Figure CN223639244U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to frequency conversion technical field especially relates to a L wave band up conversion subassembly. BACKGROUND
[0002] In modern wireless communication system, L wave band becomes the core working frequency band of satellite communication, radar system and electronic countermeasure field because of its good balance between penetration ability, antenna size and system bandwidth. As the key component of radio frequency front end, the performance of up conversion module directly determines the signal quality, anti-interference ability and reliability of the whole system.
[0003] Although the existing L wave up conversion technology is relatively mature, but in response to the above high-end application, there are still the following several significant defects:
[0004] 1. Insufficient spurious and harmonic suppression ability:
[0005] Because of the limited filter design or improper mixer selection, the spurious suppression of the traditional scheme can only reach-45dBm level, which is difficult to meet the strict requirement of ≤-50dBm for in-band non-harmonic spurious in satellite communication, and it is easy to cause co-channel interference.
[0006] In terms of harmonic suppression, the conventional structure can only achieve a suppression ratio of ≤10dBc, resulting in second and third harmonic interference output signals, which affects the linearity of the system.
[0007] 2. Local oscillator leakage is serious: the local oscillator (LO) leakage suppression ability of the existing frequency conversion module is weak, and the local oscillator leakage power is often higher than-40dBm. The larger local oscillator signal leakage to the output end or antenna end will seriously interfere with the subsequent receiving link, and even block the whole system, which has huge reliability risk.
[0008] There is an urgent need for a new L wave band up conversion module design scheme to solve the performance bottleneck of existing technology in spurious and harmonic suppression, local oscillator leakage suppression, etc. UTILITY MODEL CONTENT
[0009] The utility model aims at overcoming the problems in the prior art, and provides an L wave band up conversion subassembly.
[0010] The utility model aims at overcoming the problems in the prior art, and provides an L wave band up conversion subassembly.
[0011] The utility model provides an L wave band up conversion subassembly, which comprises input matching and filtering network, multistage mixing circuit and output control circuit which are connected in sequence.
[0012] The input matching and filtering network comprises a first band-pass filter and a first low-noise amplifier connected in sequence, and an input end of the first band-pass filter is connected with an intermediate frequency input port.
[0013] The multi-stage mixing circuit comprises:
[0014] The first-stage mixing circuit comprises a first mixer and a second band-pass filter connected in sequence, and a local oscillator port of the first mixer is connected with a first local oscillator circuit;
[0015] The second-stage mixing circuit comprises a second mixer, a second low-noise amplifier and a third band-pass filter connected in sequence, and a local oscillator port of the second mixer is connected with a second local oscillator circuit;
[0016] The output control circuit comprises a third low-noise amplifier, a single-pole single-throw switch, a first low-pass filter, a second low-pass filter and a coupler connected in sequence, and an output end of the coupler is connected with a radio frequency output port.
[0017] In some embodiments, the first local oscillator circuit comprises a fourth low-noise amplifier and a fourth band-pass filter connected in sequence, and an output end of the fourth band-pass filter is connected with the first mixer; and the second local oscillator circuit comprises a fifth low-noise amplifier and a fifth band-pass filter connected in sequence, and an output end of the fifth band-pass filter is connected with the second mixer.
[0018] In some embodiments, an output end of the coupler is connected with a detection circuit, and the detection circuit comprises a power divider and a detector connected in sequence, and the detector is of AD8313 type, and the power divider is of ADP-2-20 type.
[0019] In some embodiments, the first low-pass filter and the second low-pass filter are of LFCN-9170 type.
[0020] In some embodiments, the first low-noise amplifier and the second low-noise amplifier are of SBB5089 type, and the third low-noise amplifier is of ERA-1 type.
[0021] In some embodiments, the fourth low-noise amplifier and the fifth low-noise amplifier are of HMC451 type.
[0022] In some embodiments, the first mixer and the second mixer are of HMC554A type.
[0023] In some embodiments, the single-pole single-throw switch is of HG115KA type, and the coupler is of SYD-20-33 type.
[0024] In some embodiments, a pi-type adjustable attenuator is arranged between the first low noise amplifier and the first mixer.
[0025] In some embodiments, a pi-type adjustable attenuator is arranged between the first low pass filter and the second low pass filter.
[0026] It should be further noted that the technical features of the above-mentioned embodiments can be combined or replaced with each other to form new technical solutions without conflict.
[0027] Compared with the prior art, the utility model has the beneficial effects that:
[0028] 1. The component supports wideband processing through a double-mixing architecture, suppresses spurs to ≤-50dBm through multi-stage filtering, and improves harmonic suppression to ≤12dBc in combination with an ERA-1 amplifier and an LFCN-9170 filter; at the same time, the LO leakage is suppressed to -171dBm through a bandpass filter combination, eliminating the risk of receiver interference.
[0029] 2. The output end of the coupler of the component is connected with a detection circuit, meeting the requirement of self-detection output and being suitable for unattended or difficult-to-maintain satellite communication environments.
[0030] 3. A pi-type adjustable attenuator is arranged between the first low noise amplifier and the first mixer of the component, preventing the nonlinear distortion of the latter mixer due to excessive input power. A pi-type adjustable attenuator is arranged between the first low pass filter and the second low pass filter, accurately calibrating the final output power. BRIEF DESCRIPTION OF DRAWINGS
[0031] Fig. 1 It is a whole structure schematic view of the L-band up-conversion component of the utility model;
[0032] Fig. 2 It is a principle view of the L-band up-conversion component of the utility model. DETAILED DESCRIPTION
[0033] The technical solutions of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0034] In the description of the utility model, it needs to explain, belong to "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indication direction or positional relation is based on the direction or positional relation described in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" is only used for description purposes, and cannot be understood as indicating or implying relative importance.
[0035] In the description of the utility model, it needs to explain, belong to "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indication direction or positional relation is based on the direction or positional relation described in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" is only used for description purposes, and cannot be understood as indicating or implying relative importance.
[0036] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.
[0037] Referring to Figs. 1-2 , provide a kind of L band up conversion assembly, including input matching and filter network, multistage mixing circuit and output control circuit connected in sequence;
[0038] The input matching and filter network includes a first band-pass filter and a first low-noise amplifier connected in sequence, and the input end of the first band-pass filter is connected with an intermediate frequency input port;
[0039] The multistage mixing circuit includes:
[0040] A first mixing circuit includes a first mixer and a second band-pass filter connected in sequence, and the local oscillator port of the first mixer is connected to a first local oscillator circuit;
[0041] A second mixing circuit includes a second mixer, a second low-noise amplifier and a third band-pass filter connected in sequence, and the local oscillator port of the second mixer is connected to a second local oscillator circuit;
[0042] The output control circuit includes a third low-noise amplifier, a single-pole single-throw switch, a first low-pass filter, a second low-pass filter and a coupler connected in sequence, and the output end of the coupler is connected to a radio frequency output port.
[0043] Exemplarily, the first local oscillator circuit comprises a fourth low noise amplifier and a fourth band-pass filter connected in sequence, and an output end of the fourth band-pass filter is connected with the first mixer; the second local oscillator circuit comprises a fifth low noise amplifier and a fifth band-pass filter connected in sequence, and an output end of the fifth band-pass filter is connected with the second mixer. The first mixer and the second mixer are both HMC554A. The fourth low noise amplifier and the fifth low noise amplifier are both HMC451.
[0044] Exemplarily, an output end of the coupler is connected with a detection circuit, and the detection circuit comprises a power divider and a detector connected in sequence. The detector is AD8313, and the power divider is ADP-2-20.
[0045] Exemplarily, the first low-pass filter and the second low-pass filter are both LFCN-9170.
[0046] Exemplarily, the first low noise amplifier and the second low noise amplifier are both SBB5089, and the third low noise amplifier is ERA-1.
[0047] Exemplarily, the single-pole single-throw switch is HG115KA, and the switching time thereof is about 60 ns, which meets the index requirement of switching time ≤ 100 ns. In the working frequency range of 1 GHz to 2 GHz, the isolation degree thereof is ≥ 58 dBc, which meets the index requirement of switch isolation degree ≥ 50 dBc. The coupler is SYD-20-33.
[0048] Exemplarily, a π-type adjustable attenuator is arranged between the first low noise amplifier and the first mixer, so as to prevent the nonlinear distortion of the rear-stage mixer due to the excessive input power.
[0049] Exemplarily, a π-type adjustable attenuator is arranged between the first low-pass filter and the second low-pass filter, so as to calibrate the final output power.
[0050] Specifically, in combination with Fig. 2 , the working process of the assembly is as follows:
[0051] The input matching and filtering network first band-pass filter is directly connected with the radio frequency input port (SBMA-JFD), the first band-pass filter allows the useful signal within 1300-2300MHz to pass without attenuation and suppresses the out-of-band noise and interference. The impedance of the input signal is matched with the input impedance of the subsequent first low noise amplifier, the signal reflection is minimized, and the input VSWR (Voltage Standing Wave Ratio) is ensured to be ≤2.0. The output end of the first band-pass filter is connected to the input end of the first low noise amplifier, and the output end of the first low noise amplifier is connected to a π-type adjustable attenuator. The first low noise amplifier provides a gain of about 20dB, amplifies the weak input signal (minimum -18dBm) to a suitable level, and improves the noise figure of the entire link. The π-type adjustable attenuator (about -3dB) is used to fine-tune the signal power to prevent the nonlinear distortion of the subsequent mixer due to excessive input power.
[0052] The output of the π-type adjustable attenuator is connected to the radio frequency (RF) port of the first mixer. The first local oscillator signal of the first local oscillator circuit is connected to the local oscillator port of the first mixer through the amplification and filtering of the fourth low noise amplifier and the fourth band-pass filter. The output of the first mixer is connected to the second band-pass filter. The first mixer mixes the input RF signal (1300-2300MHz) with the first local oscillator signal (11.2GHz). The second local oscillator signal of the second local oscillator circuit is connected to the local oscillator port of the second mixer through the amplification and filtering of the fifth low noise amplifier and the fifth band-pass filter. The output of the second mixer is connected to the second low noise amplifier and the third band-pass filter. The second mixer completes the second mixing.
[0053] The third low noise amplifier raises the signal to the required output power level, the single-pole single-throw switch (SPST) provides ≥58dB fast (≤100ns) channel off capability, and is controlled by LVTTL level ("1" off, "0" on). The first low-pass filter and the second low-pass filter further suppress the harmonics of the output signal, and the coupler couples the signal to the radio frequency output port.
[0054] Further, the coupling output power of the assembly meets the index requirement of -40~-30dBm. Through testing, when the input signal is -18dBm, the output power is -1dBm; when the input signal is -5dBm, the output power is 3dBm, so the input power meets the index requirement of -18dBm~-5dBm, and the output power meets the index requirement of -1~3dBm; when the input signal is -18dBm, the coupling output power is -34dBm; when the input signal is -5dBm, the output power is -30dBm, so the input power meets the index requirement of -18dBm~-5dBm.
[0055] Further, at the channel output end, the signal is input to the detector through coupling, the working frequency of AD8313 is 0.1GHz~2.5GHz, and the detection power dynamic range is 70dB.
[0056] Further, the main harmonic of the output signal harmonic in the filter passband is satisfied by the amplifier, and the harmonic of the tested amplifier ERA-1 satisfies the requirement of ≥12dB when the input power is 10dBm; the harmonic of the output signal harmonic out of the filter passband is satisfied by the amplifier and the filter, the filter suppression is ≥55dBc, and the index requirement is satisfied.
[0057] Further, in the intermediate frequency output bandwidth of 12GHz~14GHz, there are 3 orders of spurs (LO1+2IF), and the suppression of the mixer HMC554A to the spurs is 85dBc; in the second intermediate frequency output bandwidth of 0.6GHz~2.2GHz, there are 4 orders of spurs (2LO2-2RF1) and 6 orders of spurs (3LO2-3RF1), and the suppression of the mixer HMC554A to the spurs is ≥60dBc, so the related spurs satisfy the index requirement of ≥50dBc.
[0058] Further, the input end filter standing wave is ≤1.8, the back wave loss of the subsequent amplifier is ≥13dB, the index requirement of input standing wave ≤2 is satisfied. The back wave loss of the output end coupler SYD-20-33 is ≥25dB in the working frequency of 1.5GHz, and the index requirement of output standing wave ≤2 is satisfied.
[0059] Exemplarily, the assembly can be arranged in a metal shielding cavity, a radio frequency interface and a power control interface are arranged on the side wall of the metal shielding cavity, the module is integrated, and the reliability and stability of the module are improved. Meanwhile, the assembly is assembled by combining micro assembly process and traditional process, and the volume and weight are minimized.
[0060] The above specific embodiments are detailed descriptions of the utility model, and cannot be determined that the specific embodiments of the utility model are limited to these descriptions, for ordinary skilled in the art to which the utility model belongs, on the premise of not departing from the concept of the utility model, a number of simple deductions and substitutions can be made, and all should be regarded as belonging to the protection scope of the utility model.
Claims
1. An L-band upconversion assembly, characterized by, The input matching and filtering network, the multi-stage mixing circuit and the output control circuit are connected in sequence. The input matching and filtering network comprises a first band-pass filter and a first low-noise amplifier connected in sequence, and the input end of the first band-pass filter is connected with the intermediate frequency input port. The multi-stage mixing circuit comprises: The first-stage mixing circuit comprises a first mixer and a second band-pass filter connected in sequence, and the local oscillator port of the first mixer is connected with the first local oscillator circuit; The second-stage mixing circuit comprises a second mixer, a second low-noise amplifier and a third band-pass filter connected in sequence, and the local oscillator port of the second mixer is connected with the second local oscillator circuit; The output control circuit comprises a third low-noise amplifier, a single-pole single-throw switch, a first low-pass filter, a second low-pass filter and a coupler connected in sequence, and the output end of the coupler is connected with the radio frequency output port.
2. The L-band upconversion assembly of claim 1, wherein, The first local oscillator circuit comprises a fourth low-noise amplifier and a fourth band-pass filter connected in sequence, and the output end of the fourth band-pass filter is connected with the first mixer; the second local oscillator circuit comprises a fifth low-noise amplifier and a fifth band-pass filter connected in sequence, and the output end of the fifth band-pass filter is connected with the second mixer.
3. The L-band upconversion assembly of claim 1, wherein, The output end of the coupler is connected with a detection circuit, and the detection circuit comprises a power divider and a detector connected in sequence, the model of the detector is AD8313, and the model of the power divider is ADP-2-20.
4. The L-band upconversion assembly of claim 1, wherein, The models of the first low-pass filter and the second low-pass filter are LFCN-9170.
5. The L-band upconversion assembly of claim 1, wherein, The models of the first low-noise amplifier and the second low-noise amplifier are SBB5089, and the model of the third low-noise amplifier is ERA-1.
6. A L-band upconversion assembly according to claim 2, characterized in that The models of the fourth low-noise amplifier and the fifth low-noise amplifier are HMC451.
7. The L-band upconversion assembly of claim 1, wherein The models of the first mixer and the second mixer are HMC554A.
8. The L-band upconversion assembly of claim 1, wherein, The model of the single-pole single-throw switch is HG115KA, and the model of the coupler is SYD-20-33.
9. The L-band upconversion assembly of claim 1, wherein, A π-type adjustable attenuator is arranged between the first low-noise amplifier and the first mixer.
10. The L-band upconversion assembly of claim 1, wherein, A π-type adjustable attenuator is arranged between the first low-pass filter and the second low-pass filter.