5G MIMO Panel Antenna: Ultra-Wideband Custom Solution for 617MHz to 3800MHz

Client: Major US Telecommunications Infrastructure ProviderIndustry: 5G Fixed Wireless Access (FWA), Rural BroadbandProject: Custom 5G MIMO Panel AntennaKey Requirements: 617–3800 MHz, VSWR <1.8, Gain >9 dBiCore Challenge: Extending lower frequency limit from 698MHz to 617MHzSolution: Redesigned aluminum reflector array + proprietary broadband signal combiner1. The Client Challenge: Extending the 5G Horizon

A leading North American telecom operator approached RF Element with a critical infrastructure requirement. As they expanded their 5G Fixed Wireless Access network into suburban and rural communities, they needed a compact, high-performance MIMO panel antenna capable of operating across an exceptionally wide frequency range: 617 MHz to 3800 MHz.

The core difficulty was immediately clear. While standard 5G panel antennas typically cover 698–3800 MHz, this requirement pushed the lower bound down to 617 MHz—a 12% extension in wavelength that fundamentally alters electrical length, impedance matching, and physical size constraints.Conventional designs optimized for 698 MHz simply could not maintain VSWR <1.8 or gain >9 dBi when forced to operate at 617 MHz without significant performance degradation.2. Engineering Innovation: Redesign from the Ground Up

Breaking the 698 MHz Barrier

To meet the client's 617 MHz low-band requirement while maintaining MIMO performance across the entire 3.2 GHz span, our antenna engineers rejected "off-the-shelf" modifications and instead pursued a complete redesign of two critical subsystems:

1. The Signal Reflection Aluminum Radiator Array2. The Broadband Signal Combiner Network

Custom-Designed Aluminum Radiator Array

Traditional broadband panel antennas use generic stamped radiators tuned for 698 MHz as the lowest common denominator. For this project, our team re-engineered the radiating element geometry specifically to resonate efficiently at 617 MHz without compromising high-band performance at 3.8 GHz.

This custom radiator design enables efficient current distribution at the longer 617 MHz wavelength while maintaining phase coherence at 3.8 GHz.

Proprietary Broadband Signal Combiner

Feeding a MIMO antenna across a 6:1 bandwidth ratio (617 MHz to 3800 MHz) with VSWR <1.8 is one of RF engineering's most difficult challenges. Conventional combiners exhibit severe impedance mismatch at band edges.

RF Element's solution: a multi-stage tapered impedance transformer integrated directly into the PCB feed network.

This custom combiner ensures both polarization ports maintain consistent impedance and phase relationship across the entire 617–3800 MHz spectrum—critical for MIMO beamforming performance.3. Performance Validation

After multiple design-validation cycles, including full-wave electromagnetic simulation (CST Microwave Studio) and anechoic chamber validation, the final prototype exceeded all client requirements.

4. Technical Specifications

Coverage & Capacity

• 617 MHz (Band n71) penetration: 35% improvement vs. 698 MHz baseline

• Mid-band throughput: Sustained >300 Mbps at 2 km

• C-Band (3.7 GHz): Full specification compliance

5. Customization Capabilities

This case study exemplifies RF element core engineering philosophy: No off-the-shelf compromises. We specialize in full-spectrum customization for 5G MIMO panel antennas:

Whether you require:✅ Extended low-band coverage down to 617 MHz✅ Ultra-wide bandwidth for multi-SKU consolidation✅ Compact form factor for discreet deployment✅ High-reliability materials for extreme climates

RF element delivers engineered, production-ready solutions—on your timeline.

The successful delivery of this 617–3800 MHz ultra-wideband 5G MIMO Panel Antenna demonstrates RF Element's ability to solve complex, real-world engineering problems through customized RF design, advanced materials, and rigorous validation.

By choosing to redesign the fundamental radiating structure rather than force-fitting a conventional approach, our engineering team provided the client with:

• A single antenna SKU covering 617 MHz to 3.8 GHz (replacing 2–3 conventional units)

• Verified electrical performance meeting all VSWR, gain, and pattern specifications

• Industrial-grade reliability proven across 1,200+ field deployments

• Logistical simplicity from a compact, lightweight, easy-to-install form factor

If your 5G deployment demands more than a catalog antenna, contact RF element.We engineer the connection.