L-band Transceiver Module: A High-Performance Communication Powerhouse
nnThe L-band Transceiver Module stands as a critical component in modern communication systems, offering exceptional performance and reliability. This sophisticated module is designed as a dual-transmit, four-receive configuration, with a meticulously engineered layout that integrates multiple functions into a compact form factor. On the receiving side, the module features Σ, Δ, and Ω channels, enabling precise reception and down-conversion of various mode response signals, including M1 through M6. Additionally, an ADS-B IN channel effortlessly handles ADS-B signals for enhanced situational awareness. Each receiving channel comes equipped with a built-in self-test function and supports amplitude and phase correction for the Σ, Δ, Ω, and ADS-B IN channels, ensuring signal accuracy and stability. The module also offers intermediate frequency (IF) and video output capabilities, making it versatile for diverse applications.nn
Transmission Capabilities and Reliability Features
nnIn terms of transmission, the L-band Transceiver Module boasts two dedicated channels—Σ and Ω—that perform up-conversion and power amplification for interrogation signals across M1-M6 modes. These features enable robust long-distance signal transmission. Advanced functions such as transmission detection, transceiver isolation, and standing wave detection further enhance the module’s reliability and safety, minimizing risks in demanding operational environments.nn
Key Performance Parameters and Specifications
nnTo ensure peak performance, the L-band Transceiver Module adheres to stringent performance parameters. The transmitting frequency is stable at 1030 MHz ± 0.05 MHz, with a power output of ≥ 57 dBm. On the receiving end, the center frequency is 1090 MHz ± 0.5 MHz, with sensitivity levels of ≤ -86 dBm for the Σ, Δ, and Ω channels and ≤ -90 dBm for the ADS-B channel. These specifications make the module ideal for aviation communications, radar monitoring, and other fields requiring stable and efficient signal handling. Below is a comprehensive breakdown of the module’s performance indices across transmitter, receiver, and RF power amplifier units.nn
| Parameter | Requirement |
|---|---|
| Transmitter Unit | |
| Transmitting frequency | 1030 MHz ± 0.05 MHz |
| Transmitting power | ≥ 57 dBm (transmitting module port power) |
| Modulation frame signal | AM should be at least 200ns ahead of ASK signal and 300ns behind ASK signal |
| Duty ratio | ≤ 2% |
| Reflection detection | Output 3.3V (tentative) when load standing wave ≥ 2.5, simulate pulse signal alarm |
| Pulse Envelope Characteristics | |
| Pulse Width M1, M2, M3/A, MC | 0.8 μs ± 0.05 μs |
| M5 symbol width | 1.0625 μs–1.375 μs |
| M6 (similar to M4) | 0.5 μs ± 0.05 μs |
| Pulse rising edge | ≤ 0.1 μs |
| Pulse falling edge | ≤ 0.2 μs |
| Pulse top unevenness | ≤ 0.75 dB |
| Pulse sequence unevenness | ≤ 1.0 dB |
| Harmonic Requirements | |
| Second harmonic | ≤ -80 dB or -50+10log10(P) (P = peak transmission power in W) |
| Third harmonic | ≤ -80 dB or -50+10log10(P) |
| Other harmonics | ≤ -80 dB; unexpected power output: (-30 dBm) |
| IF Interrogation Signal Input Requirements | |
| IF frequency | 130 MHz ± 0.05 MHz |
| IF amplitude | 0 dBm ± 2 dB |
| Modulation method | ASK, MSK, DPSK |
| Quantity of channels | 2 channels (Σ and Ω) |
| Detection output | ≥ +3V |
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Receiver Unit: Main Performance of Σ, Δ, Ω Receiving Channels
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| Parameter | Requirement |
|---|---|
| Receiving center frequency | 1090 MHz ± 0.5 MHz |
| Receive tangent sensitivity | ≤ -86 dBm |
| Receive dynamic range | ≥ 60 dB |
| Image rejection | ≥ 60 dB |
| Σ, Δ channel consistency (uncalibrated) | ±1 dB (amplitude); ≤ 10° (phase) |
| Anti-burning | With 1000W (or maximum transmission power) anti-burning capability |
| Out-of-band rejection | 1090 MHz ± 25 MHz (OOB), 60 dB |
| IF Response Signal Output Requirements | |
| Center frequency | 70 MHz ± 0.05 MHz (local oscillator frequency accuracy error ≤ 0.05 MHz) |
| Amplitude range | -50 dBm to +10 dBm |
| 3 dB bandwidth | 19 MHz ± 1 MHz |
| Input port standing wave ratio | ≤ 1.4 (design guarantee) |
| Noise figure | ≤ 3 dB |
| Video output | 0V–2V |
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Receiver Unit: Main Performance of ADS-B Channels
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| Parameter | Requirement |
|---|---|
| Receiving center frequency | 1090 MHz ± 0.5 MHz |
| Receive tangent sensitivity | ≤ -90 dBm |
| Receive dynamic range | ≥ 60 dB |
| Image rejection | ≥ 60 dB |
| Anti-burning | With 1000W (or maximum transmission power) anti-burning capability |
| Out-of-band rejection | 1090 MHz ± 25 MHz (OOB), 60 dB |
| IF Signal Output Requirements | |
| Center frequency | 70 MHz ± 0.05 MHz (local oscillator frequency accuracy error ≤ 0.05 MHz) |
| Amplitude range | -50 dBm to +10 dBm |
| 3 dB bandwidth | 4 MHz–6 MHz |
| Input port standing wave ratio | ≤ 1.4 (design guarantee) |
| Video output | 0V–2V |
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Broadband RF Power Amplifier Performance
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| Type | Requirement Name | No. | Requirement Value | Remark |
|---|---|---|---|---|
| Overall Working Mode | ||||
| Overall working mode | RF_001 | 1 | TDD | |
| Quantity of RF transceiver channels | RF_002 | 2 | 1T/2R | |
| RF transmit and receive channel isolation | RF_003 | 3 | ≥ 40 dB | |
| Channel-to-channel isolation (receive and receive) | RF_004 | 4 | ≥ 60 dB | |
| Transmit/receive switching time | RF_006 | 5 | ≤ 5 μs | |
| Transceiver switching requirement | RF_007 | 6 | No switching shock | |
| RF frequency | RF_008 | 7 | 1350–1550 MHz | |
| IF frequency | RF_009 | 8 | 350 MHz | |
| Signal bandwidth | RF_010 | 9 | 36 MHz | |
| Power supply | RF_011 | 10 | +28V/3A, +5.2V/2A | |
| Weight | RF_012 | 11 | ≤ 1000 g | |
| Power consumption (50% duty ratio) | RF_013 | 12 | ≤ 48W | |
| RF Port | ||||
| Characteristic impedance | RF_014 | 13 | 50 Ω | |
| Standing wave coefficient | RF_015 | 14 | ≤ 1.5 | |
| TX | ||||
| Maximum average output power (antenna port) | RF_016 | 15 | ≥ 43 dBm | When input modulation signal power is -10 dBm |
| Output power flatness | RF_017 | 16 | ≤ 2.0 dB @ 1350–1550 MHz | Within working frequency band |
| Output power flatness | RF_018 | 17 | ≤ 1.0 dB @ 36 MHz | Within RF signal bandwidth |
| Output power consistency (different modules) | RF_019 | 18 | ≤ 1 dB | |
| Peak-to-average ratio | RF_020 | 19 | 7.5 dB | |
| ACPR (OFDM) | RF_021 | 20 | ≥ 35 dBc | |
| EVM (64QAM) | RF_022 | 21 | ≤ 5% | |
| Spurious level | RF_023 | 22 | ≤ -80 dBm @ (≤1280 MHz, ≥1640 MHz) | |
| Out-of-band rejection | RF_024 | 23 | ≤ -40 dBc @ (≤1280 MHz, ≥1640 MHz) | |
| RX | ||||
| RX channel gain | RF_025 | 24 | 15 dB ± 2 dB | |
| Output power range | RF_026 | 25 | -90~0 dBm | |
| Noise figure | RF_027 | 26 | ≤ 3 dB</td
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