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

Description

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

项目	技术指标	说明
射频输入频段	43.5～44.5GHz / 44.5～45.5GHz	两段独立接收，同时工作
中频输出频段	1.66～2.66GHz	正谱变频，双频段同步输出
整机变频增益	≥60dB	全频段典型值 62dB
噪声温度	500K（Max）	室温 25℃测试条件
增益平坦度	≤2.0dBp-p（全频段）	分段带内波动≤1.5dB
外部参考频率	10MHz	正弦参考时钟
外参考输入电平	≥+5dBm	自动识别内外参考
变频频谱特性	正谱	射频升高，中频同步升高
射频输入接口	BJ400（WR22）标准波导	Q 波段专用波导接口
中频输出接口	N-50K（50Ω N 母）	射频同轴输出
供电电压	DC +12V～+18V	直流同轴馈电
输入驻波比	≤2.5	射频波导端口
中频输出驻波比	≤2.0	N型输出端口(SMA可选定制）
工作温度	-40℃～+75℃	工业级宽温
存储温度	-50℃～+70℃	仓储运输适用www.szwisi.com

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 

Parameter	Min	Typ	Max	Unit	Notes
RF Input Frequency​	43.5	–	45.5	GHz	Dual Segment
IF Output Frequency​	1.66	–	2.66	GHz	Positive Spectrum
Conversion Gain​	60	62	–	dB	Full Band
Noise Temperature​	–	450	500	K	@ +25°C Ambient
Gain Flatness​	–	–	2.0	dB p-p	Full Band
In-Band Ripple​	–	–	1.5	dB	Per Segment
Input VSWR​	–	–	2.5	–	RF Waveguide Port
Output VSWR​	–	–	2.0	–	IF Port (N-Type)
Image Rejection​	40	–	–	dBc	–
LO Frequency Stability​	±1	±3	±5	ppm	Over Temp (-40~+75°C)

1.4.2 3.2 Reference Clock & Power 

Parameter	Specification	Notes
External Reference Freq.​	10 MHz	Sine wave required
Ext. Ref. Input Level​	≥ +5 dBm	Auto-detect threshold
Reference Switching​	Auto	No manual switch required
Supply Voltage​	+12 ~ +18 VDC	Via IF Cable
Power Consumption​	< 15 W	Typical operation

1.4.3 3.3 Environmental & Mechanical 

Parameter	Specification	Notes
Operating Temperature​	-40°C ~ +75°C	Industrial Grade
Storage Temperature​	-50°C ~ +85°C	–
RF Input Interface​	BJ400 (WR22)	Standard Flange
IF Output Interface​	N-50K (Female)	SMA optional
Dimensions (LxWxH)​	[Insert Dimensions]	e.g., 150 x 80 x 60 mm
Weight​	[Insert Weight]	Approx. 500 g www.szwisi.com

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 

Model Number	Description
GKA435445G​	Q-Band Dual-Ch LNB, 43.5-45.5GHz, 1.66-2.66GHz IF, N-Type Out

 

Company Name  Shenzhen Guoxin Sichen Technology Co., Ltd.

TEl:+86 15986663916