| Model | Frequency Range | Key Differences | Maximum Analysis Bandwidth (Typical) |
| :--- | :--- | :--- | :--- |
| E4440A | 3 Hz - 50 GHz | Standard high-performance base model. | 10 MHz |
| E4443A | 3 Hz - 6.7 GHz | Optimized for wireless communications (e.g., 5G NR, 802.11ax). | 40 MHz |
| E4445A | 3 Hz - 13.2 GHz | Lower frequency range, typically a cost-effective choice. | 10 MHz |
| E4446A | 3 Hz - 26.5 GHz | Balanced range, suitable for general microwave applications. | 10 MHz |
| E4447A | 3 Hz - 32 GHz | Extended range, suitable for advanced microwave and satellite work. | 10 MHz |
| E4448A | 3 Hz - 44 GHz | Top model in the series for millimeter-wave applications. | 10 MHz |

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Detailed Model Information

1. Agilent E4440A PSA Spectrum Analyzer
Frequency Range: 3 Hz - 50 GHz
Description: This is the base model of the high-end PSA series. It offers outstanding performance and is a powerful tool for general spectrum analysis up to 50 GHz, widely used in R&D, manufacturing, and field services.

2. Agilent E4443A PSA Spectrum Analyzer
Frequency Range: 3 Hz - 6.7 GHz
Description: This model is specifically optimized for modern digital wireless communications. Its key feature is the wider 40 MHz analysis bandwidth, which is crucial for capturing broadband signals such as 5G NR, Wi-Fi 6/6E (802.11ax), and LTE-Advanced. This is its main advantage over other models in the list.

3. Agilent E4445A PSA Spectrum Analyzer
Frequency Range: 3 Hz - 13.2 GHz
Description: A cost-effective solution covering the most common frequency bands for commercial wireless applications (cellular, Wi-Fi, GPS, etc.) and basic RF work. If you don't need the extended frequency range of more expensive models, this is a perfect choice.

4. Agilent E4446A PSA Spectrum Analyzer
Frequency Range: 3 Hz - 26.5 GHz
Description: A very popular model covering the standard "microwave" range. Essential for applications such as radar, satellite communications (C, X, Ku bands), and point-to-point radio links.

5. Agilent E4447A PSA Spectrum Analyzer
Frequency Range: 3 Hz - 32 GHz
Description: Further extends into the microwave spectrum. Important for higher-frequency satellite bands (e.g., Ka band), advanced radar systems, and specialized microwave research.

6. Agilent E4448A PSA Spectrum Analyzer
Frequency Range: 3 Hz - 44 GHz
Description: The top model in the series. It enters the millimeter-wave (mmWave) range, used for cutting-edge applications such as 5G mmWave, advanced satellite transponders, and defense electronic warfare (EW) systems.

Common Features of All Models:
Outstanding Performance: All PSA series analyzers are known for extremely low phase noise, high dynamic range, and low distortion (e.g., high third-order intercept point - TOI).
Advanced Features: Can be equipped with optional hardware and software for:
Vector Signal Analysis (VSA): Demodulate and analyze complex digital signals (e.g., QAM, OFDM).
EMI Pre-compliance Testing: Measure electromagnetic interference using built-in CISPR filters and detectors.
Phase Noise Measurement: Characterize the noise performance of oscillators.
Large Display and Intuitive User Interface: Designed for analyzing complex signals with multiple traces and markers.

How to Choose:
Selecting the right model depends entirely on your application:
For 5G or broadband Wi-Fi development, the E4443A stands out due to its 40 MHz analysis bandwidth.
For general RF and wireless work up to 6 GHz, the E4445A is often sufficient and more economical.
For microwave applications (radar, satellite), you need to choose between the E4446A (26.5 GHz), E4447A (32 GHz), or E4448A (44 GHz) based on the required maximum frequency.
For the absolute highest frequency requirements (e.g., 5G mmWave, advanced electronic warfare), the E4440A (50 GHz) or E4448A (44 GHz) are the choices.
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