エリカ・ジャオ - RFおよびマイクロ波コンポーネント

How can you overcome rain fade to ensure reliable satellite communication?

Heavy rain disrupts satellite links, leading to data loss and downtime. Advanced RF solutions, however, are engineered to maintain a highly stable connection even in severe weather, minimizing disruptions and maximizing uptime. To overcome rain fade, you must combine a sufficient power margin with dynamic techniques. The best approach uses Uplink Power Control (UPC)1 to boost signal strength and Adaptive Coding and Modulation (ACM)2 to make the signal more robust, ensuring the link remains active during heavy rainfall. I learned about rain fade the hard way. Early in my career, I believed that designing a satellite system with a 3-5 dB link margin was enough to handle any weather. I […]

RF Link Budget: How to Match BUC Power with Antenna Size?

Torn between compact antenna size and raw BUC power? That compromise doesn’t just degrade signal—it costs you contracts and cuts into your margins. Matching BUC power with antenna size requires a precise RF link budget. Calculate your required EIRP, factor in the antenna gain (tied to its size), and select a BUC with enough power to overcome path loss, while staying within its linear operating range. I recently had a conversation that many of you might find familiar. A client came to me with a request. “We need to shrink our antenna from 1.2 meters to 0.6 meters to cut costs,” he said. “Can you just tweak some software parameters? […]

Is Poor Bias-Tee Matching Ruining Your LNB System’s Signal Integrity?

Your satellite system’s SNR is terrible, even with a premium LNB. You’re wasting money on components without seeing the performance benefits, making the whole system unreliable. The issue is often a poor impedance match between the Bias-Tee and the Low-Noise Block (LNB).1 To fix this, you must integrate matching considerations into the initial design phase, such as modifying ground planes, using tapered inductors, and pre-planning for matching networks. It’s a frustrating scenario I’ve seen many times in my 20 years as an engineer. A team invests in a top-of-the-line LNB with a fantastic noise figure, expecting stellar performance, only to be disappointed by the final system test results. They check […]

How Do You Manage the LNB Non-Linearity Budget in a Space-to-Ground Downlink?

Your satellite signal looks strong, but the data is corrupt and unusable. You’ve chased low noise, but now your LNB is saturated. The real problem is its non-linearity budget. To manage LNB non-linearity, you must focus on the system’s power dynamic range. The best method is a multi-stage LNA design. Use a low noise figure amplifier first, then a high OIP3 amplifier last. Add inter-stage attenuators to dynamically control power and prevent signal saturation. I thought I had the perfect setup. My new low-noise amplifier (LNA) had incredible gain, ensuring I could lock onto even the faintest satellite signals. The signal-to-noise ratio was fantastic on paper. But when I looked […]

Troubleshooting PLL Unlock Issues in Your Satcom BUC: What Are You Missing?

A BUC loses its lock, and your entire Satcom link goes down. You’ve checked the reference signal, but the problem persists. The real cause might be hiding in plain sight. PLL unlock issues in BUCs are often caused by excessive power supply ripple, not just an unstable reference signal.1 To fix this, focus on your BUC’s power circuit. Proper filtering, separate grounds, and linear regulators are essential for a stable lock and reliable performance. I remember a case a few years ago that perfectly illustrates this. We had a client with a BUC that kept losing its lock intermittently. They were convinced it was a faulty reference source. After hours […]

How Can You Accurately Measure BUC Output Power With a Spectrum Analyzer?

Getting inaccurate BUC power readings? These errors can mess up your link budget and performance assessments. Follow these tips to ensure your spectrum analyzer gives you the right numbers. To accurately measure BUC output power, first connect a high-power external attenuator to protect your equipment. Then, use a calibrated spectrum analyzer and avoid overloading its input mixer. You can verify accuracy by adjusting the analyzer’s internal attenuator and checking for changes in the measured power. I’ve spent countless hours in the lab, and I’ve seen how a seemingly small measurement error can cause big headaches down the line. It’s not just about protecting expensive gear; it’s about trusting the data […]

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Struggling to differentiate BUCs and LNBs in your satellite system design? A wrong choice can cripple your link budget. Let’s clarify their distinct roles for optimal performance. A BUC (Block Upconverter) boosts your signal’s power for uplink transmission to a satellite. An LNB (Low-Noise Block Downconverter) amplifies the weak incoming satellite signal while adding minimal noise, improving the signal-to-noise ratio (SNR) for the downlink. Their goals are power versus clarity. I’ve seen many engineers think of them as just opposites. One goes up in frequency, one goes down. But that’s missing the point. This view is too simple and can lead to bad design choices. The real story is in […]

Why is Your BUC Always Overheating?

Your BUC keeps overheating, causing link failures and costly replacements. This constant worry over system reliability is frustrating. Let’s explore why thermal management is the key to solving this. Your BUC is likely overheating due to inefficient power conversion. The internal power amplifier (PA) generates significant waste heat.1 Without proper heatsinking and airflow, this heat gets trapped, raising the internal temperature and leading to performance degradation and premature failure. I’ve been designing satellite systems for over 15 years. I have seen brilliant engineers select BUCs with perfect linearity and LO stability, only to watch them fail prematurely. They missed the silent killer: heat. Understanding where this heat comes from is […]

How Do RF Filters Really Work in a Satellite Ground Station System?

Your satellite system is plagued by interference, and you think a perfect filter is the answer. But demanding impossible specs wastes time and money, derailing your project before it even starts. An RF filter in a satellite ground station is an electronic component that selects desired signal frequencies and rejects unwanted ones.1 It works like a gatekeeper, using resonant circuits to let your specific satellite channel pass through while blocking all other signals, like noise and interference. As an RF engineer, I often get requests that sound simple but are physically impossible. I once had a client ask me to design a bandpass filter for a satellite project. “I need […]

Becoming an RF Engineer in 2026: Key Skills Needed in the SATCOM Industry.

Are you an RF engineer looking at the booming satellite communications industry? Your current skills might not be enough. A simple module swap from a different field can lead to disaster. To succeed as a SATCOM RF engineer in 2026, you must master satellite-specific skills. These include calculating detailed link budgets1, understanding high-power and high-efficiency amplification2, and designing components that withstand extreme environments3. Simple parameter tweaks from other RF fields are not sufficient for this demanding industry. I learned this the hard way. Early in my career, I tried to use a Low Noise Amplifier (LNA) in a C-band satellite system. This LNA had performed beautifully in Wi-Fi router designs. […]

投稿者: エリカ・ジャオ

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