5G and RF Components: Filters, PAs, Antenna Switches Guide for Buyers

5G and RF Components: Filters, PAs, Antenna Switches, and Front-End Modules

5G demands new RF components — higher frequencies, wider bandwidths, and more antenna paths. Here's what's different about 5G RF, popular parts, and sourcing challenges.

Why 5G RF Is Different

5G adds two new frequency ranges that change the RF bill of materials:

Key 5G RF Components

Power Amplifiers (PAs):

• GaAs HBT for sub-6GHz (Skyworks, Qorvo)
• GaN-on-SiC for mmWave base stations (more expensive but higher efficiency)
• Envelope tracking reduces PA power by 30-40% (Qualcomm, Qorvo)

Filters:

• SAW (Surface Acoustic Wave): Below 2.5 GHz, lower cost
• BAW (Bulk Acoustic Wave): 2.5-6 GHz, better rejection, more expensive
• TC-SAW (Temperature-Compensated SAW): Middle ground

Antenna Tuning:

• Aperture tuning switches can improve antenna efficiency by 2-4dB
• Key components: SP4T/SP8T RF switches, tunable capacitors

Popular 5G RF Parts

Chinese 5G RF Suppliers

• Maxscend (卓胜微) — RF switches and LNAs, dominant in Chinese smartphones
• Unisoc (紫光展锐) — 5G baseband chipsets
• Vanchip (唯捷创芯) — 4G/5G PAs, shipping to Samsung and Xiaomi
• Smarter Micro (广州慧智微) — Reconfigurable RF front-end, backed by Qualcomm

Sourcing 5G RF Components

Supply concentration: 80% of BAW filters come from Broadcom and Qorvo. Supply disruptions here impact every phone manufacturer.

Custom vs off-the-shelf: RF front-end modules are highly customized to specific phone models, making cross-reference near impossible. Plan for 12-18 month lifecycle, not 3-5 years.

Package evolution: RF SiP (System-in-Package) integrates PA + filter + switch + LNA in one module. More expensive per unit but reduces BOM complexity and PCB area.

Related Articles

• Wireless Connectivity Compared — Every protocol from BLE to 5G
• SiC vs GaN: Wide Bandgap Semiconductors for Power Electronics — GaN for RF and power
• IoT Module Selection Guide — Cellular and wireless modules