What We Do
Providing high-performance 5G RF components solutions for global clients
Featured Products
New Products
67GHz 1.85mm PTFE Armored Test Cable
1-6GHz 180 Degree Hybrid Coupler
4 Way DC-26.5GHz SMA Female Resistive Power Divider
DC-67GHz 1.85mm VNA Armored Cable Assemblies
0.01-67GHz 12dB 1.85mm Dual Directional Coupler
3-6GHz SMA Coaxial Circulator
12 Way 2-18GHz SMA Wilkinson Power Divider
4 Way 0.5-40GHz 2.92mm Wilkinson Power Divider ⎪PDE4K-0.5-40
About Us
Company History
ESJ Technology, established in 2015 and headquartered in Shenzhen, China, is a leading manufacturer of high-performance RF & Microwave components for mission-critical applications. In 2021, we established a branch office in Shanghai, ESJ Microwave Technology Co., Ltd., focusing on high-frequency microwave RF components. Our comprehensive product portfolio includes coaxial fixed attenuators/terminations, power dividers/combiners, directional couplers, RF filters, RF circulators/isolators, RF switches, amplifiers, RF duplexers, RF cable assemblies, RF coaxial adapters, waveguide to coaxial adapters etc.
Our passive RF microwave components are widely integrated into military, aerospace, defense, telecommunications, and 5G infrastructure projects across over 30 countries (United States, Germany, France, United Kingdom, Spain, Italy, Sweden, Poland, Ukraine, Japan, South Korea, Israel, etc.), delivering exceptional durability and signal integrity even in extreme operating conditions. With a track record of serving global clients with consistent product excellence and technical support, we have earned a reputation for reliability in the international RF supply chain.
We offer fully customizable RF solutions tailored to your unique project specifications, and our team is equipped to support compliance with regional regulatory requirements (including RoHS and REACH). We welcome strategic partnerships with worldwide enterprises seeking trusted, high-quality RF component suppliers.
News & Insights
July 8, 2026
New Product: SFE-402-405 Cuztomized Band Stop Filter
Product Overview Our SFE-402-405 cavity band stop (notch) filter delivers precise suppression of RF interference across the 402–405 MHz band. Built for lab and field RF systems, this compact reject filter provides minimum 55 dB deep attenuation inside its target stopband, blocking unwanted interfering signals while fully preserving clean out-of-band signals. Rated for 2 Watts…
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January 26, 2026
ESJ Lights Up Utrecht: EuroMicrowave Week 2025 Success
Concludes Successfully From September 23rd to 25th, 2025, the world's premier microwave event—EuMW 2025—successfully commenced in Utrecht, Netherlands! ESJ showcased its core technologies and solutions, concluding its overseas exhibition journey successfully and demonstrating the robust strength of "Made in China." Themed "Waves of Innovation," this year's exhibition brought together nearly 5,000 industry professionals and over…
Read MoveJanuary 7, 2026
Optimizing Phase Balance and Isolation in Broadband 2-18GHz 12-Way Power Splitters
In high-frequency microwave systems, such as phased array radars, electronic warfare (EW) modules, and wideband laboratory testing, maintaining signal integrity is paramount. Designing broadband 2-18GHz 12-Way power splitters requires a meticulous balance of physical layout and electrical performance. As the number of output channels scales up to twelve, managing key RF parameters—specifically phase balance and…
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January 7, 2026
New Release: 1W DC-110GHz Precision Fixed Attenuator
We are pleased to launch the 1W 110GHz (P/N:FAE1-110-YA) Precision Attenuator, a cutting-edge solution for high-frequency signal conditioning in aerospace, telecommunications, and test & measurement. Combining exceptional performance, rugged design and flexible configuration, it is ideal for global engineers and system integrators. Operating at 110GHz (W-band), this attenuator offers 1W CW maximum input power, meeting…
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January 4, 2026
300MHz–700MHz UAV Power Amplifier for Drone Communication
300–700 MHz UAV Power Amplifier for Mission-Critical Drone Communication The PAE-0.3-0.7 is a high-performance 300–700 MHz power amplifier specifically engineered for mission-critical unmanned aerial vehicle (UAV) communication. Operating in the UHF band, this robust UAV power amplifier delivers exceptional diffraction capabilities, long-range RF transmission, and superior resistance to non-line-of-sight (NLOS) interference. Whether deployed in civilian,…
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January 4, 2026
Applications of Microwave Components in Communication Base Stations
Communication base stations are the core infrastructure of wireless communication networks, and microwave components serve as the key building blocks of the base station's RF front-end and signal processing units. They are responsible for critical functions such as signal amplification, filtering, distribution, coupling, and attenuation, directly determining the signal quality, coverage range, and operational stability…
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December 10, 2025
Application and Key Technology Analysis of 300-700MHz RF Amplifiers
With the rapid development of unmanned aerial vehicle (UAV) technology, its application in military reconnaissance, logistics transportation, agricultural monitoring, emergency rescue and other fields is becoming more and more extensive. The RF amplifier in the 300-700MHz frequency band has become a key component of the communication and measurement and control system of drones due to…
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December 10, 2025
Customized Dual Junction Circulator
To address the specific operational needs of our valued customers, ESJ has recently developed and launched a customized dual junction circulator. Tailored for professional applications, this high-performance component covers a frequency range of 0.8-1GHz, a band widely utilized in various communication and electronic systems. A standout feature of this dual junction circulator is its low…
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