Multiband Ceramic Antenna for 4G/5G Mobile Phones

　　Multi-band Ceramic Antennas: The Core of Seamless Connectivity for 4G/5G Mobile Phones

　　In the 4G/5G mobile era, users demand uninterrupted calls, ultra-fast data transfer, and global network compatibility, making antennas a critical link between devices and networks. Our multi-band ceramic antennas, designed specifically for 4G/5G smartphones, combine high-purity ceramic dielectrics with sophisticated RF multi-band tuning technology. They address the core pain points of traditional antennas (such as limited band coverage, signal attenuation during band switching, and bulky size), while meeting the stringent space and performance requirements of modern smartphones (flagship models, foldable phones, and mid-range models). Core Technical Features: Tailored for 4G/5G mobility

　　1. Comprehensive 4G/5G Frequency Band Coverage: Compatible with global networks

　　Comprehensive 4G Frequency Band Support: Covers all mainstream 4G frequency bands from global operators:

　　FDD-LTE: n1 (2100MHz), n2 (1900MHz), n3 (1800MHz), n5 (850MHz), n7 (2600MHz), n8 (900MHz), n20 (800MHz), n28 (700MHz).

　　TD-LTE: n38 (2600MHz), n40 (2300MHz), n41 (2500MHz). Covering all key 5G Sub-6GHz frequency bands: Optimized for key 5G NR (SA/NSA dual-mode) frequency bands, enabling ultra-high-speed 5G connectivity:

　　n77 (3.3-4.2GHz), n78 (3.4-3.8GHz), n79 (4.4-5.0GHz) (global 5G core bands); n1/n3/n5/n8/n28 (4G/5G shared bands), enabling seamless handover.

　　Auxiliary Band Integration: Built-in 2.4GHz (2.402-2.484GHz) and 5GHz (5.150-5.850GHz) Wi-Fi bands, as well as Bluetooth 5.3 (2.4GHz), eliminate the need for separate Wi-Fi/Bluetooth antennas and save 40% PCB space.

　　Regional band flexibility: Customizable to local carrier requirements (e.g., North America n25, China n34, Europe n48), ensuring global compatibility with smartphones.

　　2. Ultra-compact and lightweight design: Fits into compact phone cases

　　Slim profile for modern phones:

　　Multi-band (4G+5G+Wi-Fi/Bluetooth) model: Measuring as small as 8mm × 5mm × 1.1mm, it is 35% thinner than traditional multi-band PCB antennas (typically 1.7mm thick). Ideal for ultra-thin smartphones (≤7.5mm thick) and foldable phones with limited internal space.

　　Lightweight: ≤0.3g, less than 0.1% of the weight of a standard smartphone (≈200g), ensuring device balance and portability.

　　Space-saving integration: Integrates 4G/5G/Wi-Fi/Bluetooth functionality into a single component, replacing 3-4 separate antennas. Freeing up space for larger batteries (e.g., exceeding 200mAh) or larger camera modules—key selling points for smartphone brands.

　　3. Low Dielectric Loss: Maximizing 4G/5G Signal Efficiency

　　High-Purity Ceramic Material: Utilizing 99.5% high-purity alumina ceramic (Al₂O₃), this material features the following:

　　Dielectric Constant (εr): 9.8±0.3 (25°C), ensuring stable signal transmission across all frequency bands.

　　Ultra-Low Dielectric Loss (tanδ): ≤0.0005 (10GHz)—50% lower than plastic antennas. This reduces signal attenuation by ≤8% (compared to 15-25% for traditional antennas), ensuring:

　　5G downlink speeds of up to 2.8Gbps (n78 band, 100MHz channel), 20% faster than phones using standard antennas.

　　Enables clear 4G calls (MOS score ≥ 4.5) even in weak signal areas (e.g., basements, suburban areas). High gain, suitable for weak signal scenarios:

　　4G band: 2.5dBi gain (15% greater coverage radius compared to a 1.8dBi antenna).

　　5G Sub-6GHz band: 3.0dBi gain (ensures stable 5G connection even in dense urban areas with signal congestion).

　　4. Strong interference resistance: Maintains stability even in crowded environments.

　　EMI shielding, effectively reducing internal interference within the phone: An integrated 0.1mm ultra-thin copper ground plane reduces electromagnetic interference (EMI) from phone components (CPU, battery, RF module, charging circuit) by 60%. This ensures uninterrupted signal during fast charging or high-performance gaming.

　　Band isolation and selectivity:

　　Inter-band isolation ≥ 30dB (for example, between 5G n78 and Wi-Fi 5GHz) prevents cross-interference caused by dropped calls or data delays. High Q factor (≥550 at 3.5GHz) – Enhances signal selectivity and filters out noise from adjacent frequencies (e.g., 5G n78 vs. 4G n7).

　　Concurrent and stable multi-band operation: Supports 5G data + 4G voice (VoLTE) + Wi-Fi hotspot, with no performance degradation when multiple bands operate together.

　　5. Durability and environmental adaptability: Matches the lifespan of the phone.

　　Wide operating temperature range: Stable operation from -30°C to +70°C, withstands extreme operating environments (e.g., cold winter outdoors, hot car interiors). No signal drift or component failure.

　　Moisture-resistant and corrosion-resistant: The terminal electrodes are plated with nickel-gold (Ni-Au) (thickness ≥8μm) and can withstand 300 hours of salt spray testing (in accordance with ISO 9227), preventing corrosion caused by sweat or humid environments (e.g., tropical regions). Mechanical Reliability:

　　Drop Resistance: Withstands 1.2-meter drops to concrete (compliant with GB/T 35134-2023 Mobile Phone Reliability Standard), ensuring the antenna remains intact in the event of an accidental drop.

　　Flexibility: Supports over 10,000 folding cycles (suitable for foldable phones), with a performance retention rate of ≥95%—compatible with foldable OLED screen designs.

　　6. Easy Integration and Cost Optimization

　　SMT Package, Suitable for Mass Production: Compatible with mainstream smartphone SMT assembly lines (reflow soldering peak temperature 260°C)℃±5℃, conforming to IPC/JEDEC J-STD-020), reducing assembly time by 30% vs. manual-mounted antennas.

　　No External Matching Components: Integrated LC matching circuit eliminates the need for 4-6 additional inductors/capacitors, simplifying PCB layout and cutting BOM cost by 18%.

　　Design Support: Provides 3D CAD models (STEP/IGES), antenna placement guidelines, and signal simulation data—accelerating smartphone R&D cycles by 2-3 weeks.

　　Application Scenarios: Empower All 4G/5G Smartphone Types

　　Flagship 5G Phones: Supports full 5G Sub-6GHz bands + Wi-Fi 6E, delivering premium connectivity for high-end users (e.g., 8K video streaming, cloud gaming).

　　Foldable 5G Phones: Ultra-thin (1.1mm) and foldable-resistant design fits narrow internal spaces, ensuring stable signal even when folded/unfolded.

　　Mid-Range 4G/5G Phones: Cost-effective multi-band integration (4G+5G+Wi-Fi/Bluetooth) meets budget requirements while maintaining global network compatibility.

　　Rugged 4G/5G Phones: Moisture-resistant and drop-resistant design adapts to outdoor work scenarios (e.g., construction, field research).

　　Global Version Phones: Customizable band combinations (e.g., n1/n3/n7/n78 for Europe, n2/n4/n5/n41 for North America) ensure seamless use across 100+ countries.