GARDINER GKA435445G Q 波段双频段 LNB

GARDINER GKA435445G Q 波段双频段 LNB

产品概述

型号：GKA435445G 

产品类型：Q 波段双通道低噪声下变频器（LNB）

核心特性：双射频输入分段、正谱变频、双频段同步中频输出、内外10MHz参考源自适应、高增益、低噪声、宽电压供电

低相位噪声、低噪声系数

标准中频输出频率

监控与控制接口

自动温度增益补偿。

适用于Q波段卫星地面站、射频测试、毫米波接收系统。

产品核心特点

1. 射频输入覆盖5～44.5GHz、44.5～45.5GHz 两段完整 Q 接收频段，双通道同时接收

2. 正谱变频架构，两段射频统一下变频至 66～2.66GHz 中频，两路信号同步输出

3. 整机增益≥60dB，高接收灵敏度，弱信号接收性能优异

4. 低噪声温度 500K，低底噪，保障载噪比

5. 支持内外 10MHz 参考源自适应：检测到外部 10MHz 参考自动锁外参考；无外参考自动切内参

6. 外参考输入灵敏度≥+5dBm，适配标准系统时钟

7. 全频段增益平坦度≤2.0dBp-p，带内波动≤1.5dB

8. 射频输入接口标准 BJ400（WR22）波导法兰，中频输出 50Ω N-K 母头

9. 宽直流供电 + 12～+18VDC，兼容各类卫星接收机、电源适配器

10. 一体化屏蔽腔体，抗毫米波干扰，结构稳定易安装

性能指标

外参考模式（优先） 同轴中频接口输入 10MHz、幅度≥+5dBm 正弦参考信号，LNB 自动识别并锁定外部 10MHz 时钟，本振频率稳定度跟随系统参考，适合高精度同步地面站、射频测试系统。

1. 内置参考模式（兜底）未接入有效外部 10MHz 参考时，设备自动切换内置高稳晶振，独立稳定工作，适配简易单站接收场景。

2. 切换逻辑：实时检测参考信号，无人工切换开关，上电自动识别。

1.1 五、接口定义

1. 射频输入：BJ400/WR22矩形波导法兰，对接 Q 波段天线馈源

2. 中频综合输出：N-50K 同轴母头

1. 传输 66~2.66GHz 中频射频信号

2. 馈入 + 12~18V 直流供电

3. 可输入 10MHz 外部参考时钟信号

1.2 六、典型应用场景

1. Q 波段 VSAT 固定卫星地面接收站

2. 毫米波射频测试、频谱监测接收机前端

3. 卫星遥感、射电天文 Q 波段接收设备

4. 通信基站毫米波回传接收前端

5. 便携式移动卫星接收终端

GKA435445G Q-Band Dual-Channel Low Noise Block Downconverter (LNB)

1. Product Description 

 GKA435445G is a high-performance Q-Band Dual-Channel Low Noise Block Downconverter (LNB) designed for advanced satellite communication and millimeter-wave measurement systems. It integrates two independent receive channels covering the full 43.5–45.5 GHz spectrum, down-converting them simultaneously to a standard 1.66–2.66 GHz IF output.

Featuring a positive frequency conversion architecture, auto-sensing internal/external reference switching, and an industrial-grade wide-temperature design, this unit offers exceptional sensitivity (Noise Temp ≤ 500K) and high gain (≥ 60 dB). It is housed in a compact, shielded aluminum cavity, making it ideal for both fixed ground stations and portable terminals.

1.3 2. Key Features 

Dual Segment Coverage: Simultaneous reception of 43.5–44.5 GHz and 44.5–45.5 GHz.

Positive Spectrum Output: RF frequencies map directly to IF frequencies (1.66–2.66 GHz).

High Gain & Low Noise: ≥ 60 dB conversion gain with a maximum noise temperature of 500 K.

Smart Reference Switching: Automatically detects external 10MHz reference (≥ +5 dBm); falls back to internal OCXO if absent.

Wide Voltage Input: Supports +12 VDC to +18 VDC via the IF coaxial cable (PoE capable).

Superior Stability: Gain flatness ≤ 2.0 dB p-p; operating temperature range -40°C to +75°C.

Standard Interfaces: BJ400 (WR22) waveguide input and N-Type (50Ω) IF output.

1.4 3. Technical Specifications 

1.4.1 3.1 Electrical Performance 

1.4.2 3.2 Reference Clock & Power 

1.4.3 3.3 Environmental & Mechanical 

1.5 4. Functional Description 

1.5.1 4.1 Reference Clock Logic 

The GKA435445G features a seamless reference clock management system:

External Priority: Upon power-up, the unit monitors the IF port for a 10MHz signal. If a valid signal (≥ +5 dBm) is detected, the unit locks to the external reference immediately.

Internal Fallback: If no external signal is present, the unit automatically switches to the internal high-stability oven-controlled crystal oscillator (OCXO) to ensure continuous operation.

Real-time Detection: The unit continuously monitors the reference signal during operation.

1.5.2 4.2 Power Supply 

The device utilizes a single DC power input through the IF output connector. A regulated +12V to +18V DC source is required.

1.6 5. Application Scenarios 

Q-Band VSAT Ground Stations: High-throughput satellite communications.

Radio Astronomy & Remote Sensing: Reception of weak cosmic microwave signals.

Millimeter-Wave Test Systems: Front-end downconversion for spectrum analyzers.

5G/6G Backhaul: Point-to-point high-frequency link receivers.

Portable Terminals: Compact and robust design suitable for field deployment.

1.7 6. Outline Drawing & Interface Definition 

(Note: Insert mechanical drawing here)

RF Input Port: BJ400 (WR22) Rectangular Waveguide Flange.

IF Output Port: N-Type Female (50Ω). Functions as:

Signal Output: 1.66–2.66 GHz IF.

DC Input: +12V to +18V Power.

Ref Input: 10 MHz External Clock.

1.8 7. Ordering Information 

Company Name  Shenzhen Guoxin Sichen Technology Co., Ltd.

TEl:+86 15986663916