5GHz vs 6GHz Wireless Bridge: A Technical and Deployment Comparison Using LigoWave Products

Spectrum Fundamentals: 5GHz vs 6GHz for Wireless Bridges

Regulatory Landscape and Spectrum Availability

The 5GHz band has been the backbone of unlicensed wireless communications for two decades. In most regulatory domains, it offers approximately 700MHz of spectrum divided into sub-bands: 5.150-5.250GHz (UNII-1), 5.250-5.350GHz (UNII-2 with DFS), 5.470-5.725GHz (UNII-2 Extended with DFS), and 5.725-5.850GHz (UNII-3/ISM). However, the DFS requirement in the UNII-2 bands means that devices must detect and avoid radar signals, which can cause unpredictable channel unavailability. In a 2024 spectrum utilization study conducted in three European capital cities, an average of 34% of DFS channels were blocked or restricted at any given time due to radar activity.

The 6GHz band (5.900-6.400GHz, sometimes referred to as the lower 6GHz band) is relatively new for unlicensed use in many regions. It offers 500MHz of spectrum with substantially fewer existing users. Site surveys conducted in the same three European cities showed that 6GHz channels had an average occupancy rate below 5%, compared to 65-80% for 5GHz channels in the same locations. This translates directly to channel planning flexibility a 6GHz deployment can consistently use 80MHz channels, while a 5GHz deployment may be forced to use 40MHz or even 20MHz channels in congested areas.

Propagation Characteristics

From a physics perspective, 6GHz signals experience approximately 2-3dB higher free space path loss than 5GHz signals over the same distance. This means that for a given antenna gain and transmit power, a 5GHz link will have a slightly higher link margin. For LigoWave products, where both 5GHz and 6GHz models share the same 30dBm radio output power, this translates to approximately 15-25% greater theoretical range for 5GHz links, all else being equal.

However, propagation differences between 5GHz and 6GHz are minimal compared to the jump from 2.4GHz to 5GHz (which involves roughly 6dB of additional path loss). The practical implication is that for most deployment scenarios, the range difference between 5GHz and 6GHz is negligible and is far outweighed by the interference advantages of 6GHz.

Interference and Real-World Throughput

The most significant performance differentiator between 5GHz and 6GHz is not propagation it is interference. In urban and suburban environments, the 5GHz band is shared with Wi-Fi access points, outdoor mesh networks, municipal Wi-Fi systems, and radar systems (DSF). A typical urban 5GHz deployment will encounter 15-30 competing signals per channel, each contributing to the noise floor and reducing the achievable signal-to-noise ratio (SNR).

In contrast, 6GHz deployments in most locations encounter 0-3 competing signals per channel. This cleaner spectral environment means that a 6GHz link can consistently operate at higher modulation rates (typically 256-QAM vs 64-QAM for 5GHz in the same location), resulting in 50-150% higher actual throughput even though the theoretical maximum throughput of the hardware platforms is similar.

LigoWave Product Comparison: 5GHz vs 6GHz Models

Frequency Band Differences Across the Product Line

LigoWave’s product portfolio is organized by both frequency band and deployment topology. The LigoDLB 5ac is the only 5GHz device, operating in the 5.150-5.850GHz band with N-type connectors for external antenna support. The four 6GHz devices operate in the 5.900-6.400GHz band, offering a mix of integrated antenna options (LigoPTP 6-25, LigoDLB 6-15ac, LigoDLB 6-20ac) and external antenna support (LigoPTP 6-N).

Cross-Band Model Comparison

Protocol Differences: W-Jet 5 and iPoll 3 Across Bands

The protocol choice is independent of the frequency band it is determined by the product family. LigoPTP RapidFire series devices (6-N, 6-25) use W-Jet 5, while LigoDLB ac series devices (6-15ac, 6-20ac, 5ac) use iPoll 3. This means that the frequency band decision and the protocol decision are separate considerations:

• W-Jet 5 (PTP only): Available exclusively on 6GHz models (6-N, 6-25). Best for dedicated point-to-point backhaul requiring maximum throughput and stability.
• iPoll 3 (PTMP and PTP): Available on both 6GHz (6-15ac, 6-20ac) and 5GHz (5ac). Best for point-to-multipoint deployments or shorter-range point-to-point links.

Deployment Scenarios: When to Choose 5GHz vs 6GHz LigoWave Products

Scenario 1: Urban ISP Backhaul (Choose 6GHz)

A regional ISP in a densely populated European city needs to deploy 8 point-to-point backhaul links to connect suburban base stations to a central fiber POP. Distance range is 3-12km per link. Spectrum analysis in the target area shows 5GHz channel occupancy averaging 78%, with only two 40MHz channels consistently available. The 6GHz band shows under 10% occupancy with eight clean 80MHz channels available.

Recommended Solution: LigoPTP RapidFire 6-N for links exceeding 8km (with appropriate external parabolic antennas) and LigoPTP 6-25 for shorter links. The W-Jet 5 protocol’s interference mitigation and the 6GHz spectral cleanliness combine to deliver 550-680Mbps actual throughput per link, compared to an estimated 200-300Mbps if 5GHz were used in this environment. The 6-N’s integrated 2.4GHz management radio also simplifies tower-top alignment a practical advantage when deploying 8 links across different tower sites.

Scenario 2: Rural PTMP Connectivity (Evaluate Both)

A government rural connectivity project in a sparsely populated region needs to connect 50 remote households and schools to a central fiber point. Distances range from 3-15km. Spectrum congestion is minimal in this rural environment both 5GHz and 6GHz bands show less than 10% occupancy.

Recommended Solution: For the PTMP access segment (connecting households within 5km of distribution points), LigoDLB 6-15ac devices provide a lightweight, low-power solution. The integrated 15dBi antennas eliminate the need for external antenna installation at each subscriber location, reducing per-site installation costs. For longer backhaul links from distribution points to the central POP, LigoPTP 6-25 provides the necessary range and 700Mbps throughput. The LigoDLB 5ac could serve as an alternative for the longest links (15km+) if paired with a high-gain parabolic antenna, but the 6GHz spectrum advantage is unnecessary in this low-interference environment.

Scenario 3: Mixed-Band Enterprise Campus (Use Both)

A large industrial campus with existing 5GHz Wi-Fi and LigoWave 5GHz infrastructure needs to add a new 6GHz backhaul ring while maintaining backward compatibility with 5GHz CPE devices. The campus has high 5GHz usage from employee Wi-Fi, making additional 5GHz wireless bridges impractical.

Recommended Solution: Deploy LigoPTP RapidFire 6-N as the campus backbone ring, using the 6GHz band for interference-free backhaul. Use the existing LigoDLB 5ac devices as legacy CPE connections where they are already deployed. The iPoll 3 protocol running on both the LigoDLB 5ac and LigoDLB 6-15ac/6-20ac ensures that the management and configuration approach is consistent across both frequency bands, simplifying network operations during the migration period. This hybrid approach allows the organization to benefit from 6GHz capacity without an immediate forklift upgrade of all 5GHz equipment.

Scenario 4: Long-Distance Environmental Monitoring (5GHz Advantage)

An environmental monitoring project requires connecting remote weather stations across a desert region, with link distances of 20-50km. Power is limited to solar panels, and spectrum congestion is essentially zero.

Recommended Solution: The LigoDLB 5ac paired with a high-gain parabolic antenna provides the best range-to-cost ratio for this scenario. The 5GHz propagation advantage (2-3dB lower path loss) translates to approximately 20-25% more link margin at maximum range. The 5ac’s external antenna support allows selection of the optimal antenna gain for each specific link distance. At 500Mbps throughput and 10W power consumption, the 5ac provides ample capacity for weather data transmission while preserving solar power budget. For the few shorter links (under 10km) where spectral cleanliness is beneficial, the LigoDLB 6-20ac could be deployed at base station aggregation points.

Decision Matrix Summary

Real-World Case Studies and Performance Data

Case Study 1: Kazakhstan LigoPTP RapidFire 6-25 at 10.78km

A published LigoWave case study from Kazakhstan documents a deployment of LigoPTP RapidFire 6-25 units over a 10.78km point-to-point link operating on an 80MHz channel in the 6GHz band. The link consistently delivered 460Mbps actual TCP throughput, achieving 65% of the theoretical 700Mbps maximum. The Kazakhstan study is notable because the 6GHz band in this region had minimal competing signals, demonstrating that even with the modest 25dBi integrated antenna, the 6-25 can achieve substantial real-world throughput at significant distances. Factors contributing to the successful deployment included clear line-of-sight, appropriate Fresnel zone clearance, and the W-Jet 5 protocol’s efficient utilization of the clean 80MHz channel.

Case Study 2: Russia LigoPTP RapidFire 6-N Long-Distance Deployment

A published LigoWave case study from Russia demonstrates the long-distance capability of the LigoPTP RapidFire 6-N. Deployed with high-gain external parabolic antennas, the 6-N established a reliable point-to-point link exceeding 50km. While the specific throughput figures are deployment-dependent (varying with antenna gain, channel width, and local spectrum conditions), the case study validates that the 6-N platform with its 30dBm radio, W-Jet 5 protocol, and external antenna flexibility can achieve carrier-grade performance at extreme distances. The 6-N’s IP-67 rating and IEC Class 4 surge protection were critical for the harsh environmental conditions of the deployment site.

Case Study 3: Russia LigoDLB 6-15ac Video Surveillance

A published LigoWave case study from Russia documents a LigoDLB 6-15ac deployment for video surveillance backhaul. The 6-15ac’s compact form factor (158mm x 97mm x 38mm, 185g) and IP-65 rating made it suitable for discrete installation on existing infrastructure without specialized mounting hardware. The 500Mbps+ throughput capacity supported multiple HD video streams simultaneously. The iPoll 3 protocol’s efficient handling of the constant bitrate video traffic was noted as a key operational advantage.

Performance Comparison: Expected Throughput by Frequency Band

Frequently Asked Questions