Understanding TwistPort™ Adaptors (TPA)

This blog post has been provided by Juraj Taptic, RF Elements Co-Founder and CEO

Connecting 5 GHz, 6 GHz and Wideband Radios the Smart Way

RF elements® antennas are built around the TwistPort™ waveguide interface, eliminating lossy pigtails and creating a clean, mechanically integrated RF connection.

To connect radios that use coaxial outputs, RF elements offer TwistPort Adaptors (TPA) — converting standard coax interfaces into a TwistPort male waveguide interface, while providing easy and secure integration and minimized insertion loss..

As networks evolve from 5 GHz to 6 GHz and multi-band deployments, selecting the correct TPA becomes essential.

Why TPA Selection Matters

While a TPA may look like a simple accessory, it plays a critical role in:

• Maintaining impedance continuity
• Minimizing insertion loss
• Preserving radiation integrity
• Ensuring mechanical stability
• Protecting the radio

Unlike standard pigtails, TPAs use controlled semi-rigid coax internally and are not repeatedly threaded, twisted and bent, ensuring consistent long-term performance.

Match the frequency bands to avoid issues

Every RF engineer understands the principle of matching the intended working band of a radio with the working band of an antenna. Wrong choice can result in radio damage caused by reflected signal coming back from the unmatched antenna to radio output circuits.

TPAs shall be considered the functional part of the antenna once they are connected to it. Therefore use exactly the same rule of thumb - always match the working bands of the radio, TPA and antenna to create a coherent and compatible setup.

The rule is very simple: Freq Range of Radio ≤ Freq Range of TPA ≤ Freq Range of Antenna

In case you are not sure about the intended setup, we are happy to help with our qualified recommendation.

Investment Protection and Ecosystem Flexibility

One of the biggest advantages of the TwistPort ecosystem: If a network operator changes radio vendor, the antennas remain. Only the adaptor needs to be replaced. The upgrades and replacements are super easy and quick procedures.

TP ecosystem allows:

• Scalable and future-proof deployment
• Infrastructure protection
• Low long-term upgrade cost
• Vendor flexibility
• Simplified migration strategies

Let's take a look at TPAs in terms of frequency segmentation and compatibility to a vendor platform.

TPA Segmentation by Radio Vendor

To ensure mechanical precision and optimal RF transition, RF elements offers TPAs tailored to specific radio platforms.

TPA for Ubiquiti (UI) Designed for connectorized Ubiquiti radios Precision-fit mechanical housing Clean integration with TwistPort antennas Common models include: TPA-PAF-V2 - supports Prism 5AC, airFiber 5X, LTU and Wave MLO5 TPA-R5AC - for Rocket 5 AC-Lite

TPA for Cambium Networks ePMP Series Since Cambium Networks keep consistent form factor of their AP radios in ePMP line, all is needed is to focus on a form factor and frequency range Common models include: TPA-ePMP-A - 5 GHz narrow body radios (ePMP1000 + CSM, 3000L, 300CSM, 450b) TPA-ADAP-e2k - 5 GHz wide body radios (ePMP2000 AP, 400C, 4500L) TPA-ePMP-B-6 - 6 GHz wide body radios (ePMP4600L, 4600C)

TPA for MikroTik Designed for MikroTik RouterBOARD allows easy mechanical integration aligned to MikroTik RB form factor. Common models include: TPA-RBC - for 5 GHz RouterBoards Series 4, 7, 9, M11 TPA-RBC-XL - for 5 GHz RouterBoards Series L11

TPA for Mimosa Optimized for Mimosa waveguide radios. Simple waveguide-to-waveguide adaptor with near-zero loss. Common models include: TPA-AMU-V3 - for 5 GHz and 6 GHz B5X, C5X, B6X and C6X /LE radios

Universal TPAs with RP-SMA For radios not covered by platform-specific TPAs, RF elements offer Universal TwistPort Adaptors (SMA variants). Features: Dual RP-SMA connectors Flexible radio compatibility Ideal for niche or specialized platforms Suitable for cost sensitive, integrator, and custom deployments Universal TPAs allow almost any connectorized radio to be connected to TwistPort ported antennas. Common models include: TPA-SMA - for 5 GHz TPA-SMA6 for 6 GHz

Frequency Segmentation: 5 GHz, 6 GHz and Wideband

5 GHz Legacy TPA

Designed for traditional U-NII-1 to U-NII-3 band deployments, 5 GHz TPAs support standard 5 GHz radios. They maintain optimized impedance and insertion loss in the 5 GHz band. They are ideal for:

• Legacy 5 GHz sector builds
• Mature WISP infrastructure
• Cost-sensitive upgrades

With certain symmetrical horn and dish antennas, the legacy TPA feeding structure can deliver acceptable performance even into the 6 GHz band. This is reflected in our recommendations for transition scenarios, where legacy solutions may be used temporarily until dedicated wideband structures are available.

Dedicated 6 GHz TPA

With the expansion of Wi-Fi 6E and 6 GHz PtMP radios, 6 GHz TPAs are engineered for U-NII-3 to U-NII-7 band outdoor deployments. They are optimized to provide tighter tolerances and stable performance across the 6 GHz band

Recommended for:

• Dedicated 6 GHz deployments
• AFC-regulated environments
• New spectrum builds

Wideband TPA (5 + 6 GHz)

The Wideband TPA supports both bands within a single adaptor. Designed to cover U-NII-1 through U-NII-8 band deployments, delivering excellent VSWR and class leading port isolation.

The 5 + 6 GHz wideband TPAs are scheduled for release in 2026, alongside radio platforms capable of fully utilizing their wideband performance. Stay tuned for updates on availability.