Microwave fixed wireless internet delivers broadband connectivity by transmitting data through radio waves between two fixed points—no cables, no trenches, no physical infrastructure between endpoints. For businesses where fiber deployment is cost-prohibitive, or for carriers needing to bridge network gaps quickly, microwave wireless has become a legitimate primary connectivity option rather than a fallback.
This technology powers rural last-mile connections serving small businesses and carrier-grade backhaul links handling multi-gigabit traffic across metropolitan areas. This article covers the technical fundamentals, performance characteristics, weather considerations, security posture, and practical trade-offs of microwave fixed wireless internet.
What Is Microwave Fixed Wireless Internet?
Microwave fixed wireless internet uses radio frequencies—generally between 1 GHz and 100 GHz—to deliver broadband connectivity between two fixed locations without any physical cable connecting them. Unlike mobile wireless, which serves moving devices across wide cells, microwave fixed wireless establishes a dedicated link between stationary endpoints: a base station or tower on one end, a customer-premises antenna on the other.
Deployments fall into two main categories. Point-to-point (PtP) links connect exactly two locations with a focused beam, typically used for high-capacity backhaul or enterprise campus interconnects. Point-to-multipoint (PtMP) architectures broadcast from a single base station to multiple subscriber antennas, practical for serving several businesses or homes in a defined coverage area.
Common deployment scenarios include:
- Rural and suburban last-mile connectivity where fiber trenching costs exceed $20,000–$80,000 per mile
- Enterprise campus interconnects across buildings or across a street
- Carrier backhaul for cellular towers
- Temporary connectivity for construction sites, events, or disaster recovery
For broader context on this technology category, see what is fixed wireless internet.
How Microwave Fixed Wireless Internet Works
The transmission process follows a clear sequence:
- Data enters the radio unit at the transmitting end, typically from a router or switch.
- A transceiver modulates the data onto a microwave carrier frequency using techniques like Quadrature Amplitude Modulation (QAM). Higher-order modulation—256-QAM or 1024-QAM—packs more bits per symbol, increasing throughput but requiring a stronger signal.
- An antenna focuses the signal into a narrow beam directed at the receiving antenna. Dish antennas in the 18–80 GHz range typically measure 30 cm to 120 cm in diameter.
- The receiving antenna captures the signal and passes it to a demodulator, which reconstructs the original data stream.
- The output connects to the customer’s network via Ethernet or fiber handoff.
Common frequency bands include 6 GHz, 11 GHz, and 18 GHz for medium-range licensed links; 60 GHz (V-band) and 80 GHz (E-band) for short-range, high-capacity urban deployments. Each band involves trade-offs between range, throughput, and susceptibility to interference and weather.
Line of Sight Requirements and Coverage Distance
Microwave links typically require unobstructed line of sight (LOS) between the two antennas. This goes beyond a clear visual path—it includes maintaining Fresnel zone clearance. The Fresnel zone is an elliptical volume around the direct signal path; obstructions within roughly 60% of this zone degrade signal quality even if the antennas can technically see each other. A tree growing into the Fresnel zone on a 5-mile link can cause 3–6 dB of signal loss.
Obstacles that affect microwave links include buildings, terrain elevation changes, dense foliage, and the curvature of the earth on longer spans.
Typical coverage distances by band:
| Frequency Band | Typical Max Range | Notes |
|---|---|---|
| 5.8 GHz (unlicensed) | 10–25 miles | nLOS capable, lower capacity |
| 6–11 GHz (licensed) | 20–50 miles | Long-range backhaul standard |
| 18–23 GHz (licensed) | 5–15 miles | Rain fade risk above 10 GHz |
| 60 GHz (unlicensed) | 0.5–2 miles | Very high capacity, short range |
| 80 GHz (licensed) | 1–5 miles | Multi-gigabit, urban backhaul |
Near-line-of-sight (nLOS) configurations using lower frequencies (below 6 GHz) can tolerate partial obstructions, making them viable in wooded or hilly terrain where strict LOS is impractical.
Licensed vs. Unlicensed Microwave Bands
The choice between licensed and unlicensed spectrum is one of the most consequential decisions in microwave link design.
| Criteria | Licensed Bands | Unlicensed Bands |
|---|---|---|
| Interference protection | Regulatory exclusivity in area | Shared spectrum, no protection |
| Deployment speed | Weeks to months (licensing) | Days to weeks |
| Cost | Higher (licensing fees + equipment) | Lower upfront cost |
| Reliability | Carrier-grade, 99.999% achievable | Variable, environment-dependent |
| Typical use case | Enterprise, carrier backhaul | SMB, temporary links, rural ISPs |
| Frequency examples | 6, 11, 18, 23, 80 GHz | 5.8 GHz, 60 GHz |
Licensed bands require coordination with the FCC or equivalent national regulator. The licensing process grants exclusive use of a specific frequency pair in a geographic area, eliminating the interference risk that plagues unlicensed deployments.
Pro tip: For any link carrying mission-critical traffic—healthcare data, financial transactions, or primary business connectivity—licensed spectrum is non-negotiable. Interference protection alone justifies the licensing overhead, which typically runs $500–$2,000 per link annually in the U.S.
Speed, Latency, and Performance
Real-world throughput varies by frequency and equipment generation:
- Lower licensed bands (6–11 GHz): 100 Mbps to 1 Gbps full-duplex
- Mid-range licensed bands (18–23 GHz): 500 Mbps to 2 Gbps
- E-band (80 GHz): 1 Gbps to 10 Gbps, with some deployments exceeding 20 Gbps using channel bonding
Latency is where microwave fixed wireless competes directly with fiber. A well-engineered microwave hop delivers 1–5 ms of one-way latency, comparable to fiber’s 0.5–2 ms over equivalent distances.
On long geographic routes, microwave can outperform fiber. Radio waves travel at approximately 299,700 km/s in air, while light in fiber travels at roughly 200,000 km/s due to the refractive index of glass—a ~33% speed disadvantage for fiber. This makes microwave attractive for latency-sensitive financial trading applications on specific routes.
Common mistake: Assuming fiber always wins on latency. For point-to-point distances under 50 miles, the latency difference between a well-engineered microwave link and fiber is under 1 ms—imperceptible for virtually every enterprise application.
For throughput expectations across deployment types, see fixed wireless internet speeds.
Weather Impact and How It Is Managed
Rain fade is the primary weather concern for microwave links operating above 10 GHz. Heavy rainfall attenuates the signal as water droplets absorb and scatter microwave energy. At 18 GHz, a rainfall rate of 25 mm/hour can cause 3–5 dB/km of additional attenuation. At 80 GHz, that same rainfall causes 10–15 dB/km.
Operators manage rain fade through several techniques:
- Adaptive Coding and Modulation (ACM): The radio automatically steps down from 1024-QAM to lower modulation orders during rain events, trading throughput for link stability. A link running at 1 Gbps in clear conditions might drop to 200 Mbps during heavy rain—but stays connected.
- Fade margin engineering: Links are designed with 20–40 dB of fade margin above the minimum receive threshold, providing headroom for weather-induced attenuation.
- Space diversity: Two antennas at slightly different heights receive the same signal; the system selects the stronger path, mitigating multipath fading.
- Frequency diversity: Transmitting on two different frequencies simultaneously reduces the probability that both suffer simultaneous deep fades.
- Lower frequency selection: For regions with heavy annual rainfall, choosing 6–11 GHz over 18+ GHz significantly reduces rain fade risk.
Key Benefits of Microwave Fixed Wireless Internet
- Rapid deployment: A licensed microwave link can be operational in 4–8 weeks, versus 6–18 months for fiber construction in urban areas.
- Cost-effective reach: Connecting two locations 10 miles apart via microwave typically costs $15,000–$50,000 in equipment and installation, compared to $200,000+ for fiber trenching across the same distance.
- Scalable bandwidth: Modern radios support software-upgradable capacity, allowing throughput increases without hardware replacement.
- Network redundancy: Microwave links serve as a proven diversity option alongside fiber. A 500-employee office running dual-path connectivity—fiber primary, microwave secondary—achieves near-continuous uptime even during fiber cuts.
Decision framework for primary vs. backup use:
- If fiber is available and cost-effective → use microwave as a backup internet connection for redundancy
- If fiber deployment costs exceed $100,000 → evaluate microwave as primary connectivity
- If deployment timeline is under 90 days → microwave is the only realistic option
- If the route exceeds 20 miles with clear terrain → licensed microwave at 6–11 GHz
Security and Encryption in Microwave Links
Microwave links are inherently more difficult to intercept than fiber given the narrow beam width—a 23 GHz dish antenna typically produces a beam only 2–4 degrees wide. Physical interception requires positioning specialized equipment precisely within that beam, which is detectable and impractical for most threat actors.
Narrow beams are not a security strategy on their own. Modern enterprise microwave radios implement AES-128 and AES-256 encryption at the physical layer per NIST FIPS 197, ensuring data remains protected even if the signal is captured.
Additional security practices for microwave deployments:
- VLAN segmentation to isolate traffic types on shared links
- SNMPv3 or NETCONF for encrypted management plane access
- Regular firmware updates to address radio-specific vulnerabilities
- Network monitoring for anomalous signal patterns that could indicate interference or interception attempts
Frequently Asked Questions
What is microwave fixed wireless internet? Microwave fixed wireless internet is a broadband connectivity technology that transmits data using microwave radio frequencies between two fixed antenna locations, eliminating the need for physical cable infrastructure between endpoints.
How does microwave internet work? A transceiver modulates data onto a microwave carrier frequency, transmits it via a directional antenna to a receiving antenna at the remote location, where it is demodulated and delivered as standard Ethernet or fiber output to the customer’s network.
How fast is microwave fixed wireless internet? Speeds range from 100 Mbps on older lower-band equipment to 10+ Gbps on modern E-band (80 GHz) systems. Most enterprise deployments operate in the 500 Mbps to 2 Gbps range.
Does microwave internet require line of sight? Most microwave links require clear line of sight with adequate Fresnel zone clearance. Near-line-of-sight options exist at lower frequencies (below 6 GHz) for environments with partial obstructions.
Is microwave internet affected by rain or bad weather? Rain fade affects links above 10 GHz during heavy rainfall. Operators mitigate this through adaptive modulation, fade margin engineering, and diversity antenna configurations. Lower-frequency bands are substantially less affected.
What is the latency of microwave internet compared to fiber? Microwave links deliver 1–5 ms latency, comparable to fiber for most applications. On long geographic routes, microwave can outperform fiber due to the faster propagation speed of radio waves versus light in glass.
Is microwave internet available in my area? Availability depends on local ISPs, terrain, and spectrum licensing. Rural and suburban areas often have microwave ISPs serving business customers; urban areas typically have multiple licensed operators.
Can microwave fixed wireless be used as a backup internet connection? Microwave is widely deployed as a failover solution alongside fiber, providing redundant paths that are physically independent and resilient to fiber cuts or infrastructure failures.
Conclusion
Microwave fixed wireless internet is a mature, high-performance technology with a well-established track record in enterprise networking, carrier backhaul, and rural broadband delivery. Its 1–5 ms latency, multi-gigabit throughput potential, and deployment timelines measured in weeks rather than months make it a credible alternative or complement to fiber across a wide range of scenarios.
The key variables that determine success—line of sight clearance, spectrum licensing, frequency selection for weather resilience, and encryption configuration—are all manageable with proper engineering. Whether deployed as a primary connection or as a redundant path protecting against fiber outages, microwave fixed wireless deserves serious consideration in any network architecture discussion.