Mesh WiFi 全屋覆蓋指南 | Mesh WiFi Whole-Home Coverage Guide

乜嘢係 Mesh WiFi？What Is Mesh WiFi?

Mesh WiFi 係一種由多個節點（nodes）組成嘅無線網絡系統。唔同於傳統嘅單一路由器，Mesh 系統透過多個相互連接嘅節點，將 WiFi 訊號均勻地覆蓋到屋企每一個角落。每個節點都識得互相溝通，自動搵到最快嘅傳輸路徑，確保你無論企喺屋企邊度，都可以享受穩定嘅上網體驗。

Mesh WiFi is a wireless networking system composed of multiple nodes. Unlike a traditional single router, a mesh system distributes WiFi signal evenly throughout your home via interconnected nodes. Each node communicates with the others and automatically finds the fastest transmission path, so no matter where you are in your home, you enjoy a stable internet connection.

你可以將 Mesh 想像成一組團隊合作嘅路由器：佢哋共用同一個 WiFi 名稱（SSID），當你由客廳行去房間，你嘅裝置會自動無縫切換到訊號最強嘅節點，唔需要手動轉 WiFi。呢個功能叫做「無縫漫遊」（seamless roaming），係 Mesh 系統最大嘅賣點之一。

Think of mesh as a team of cooperating routers: they share the same WiFi name (SSID), and as you walk from the living room to a bedroom, your device automatically and seamlessly switches to the node with the strongest signal -- no need to manually switch networks. This feature, called seamless roaming, is one of the biggest selling points of mesh systems.

Mesh WiFi vs 傳統路由器 vs 延伸器 | Mesh vs Traditional Router vs Range Extender

傳統路由器 Traditional Router

傳統路由器以一個中央點發射 WiFi 訊號。訊號強度隨距離遞減，遇到牆壁、傢俬等障礙物更會大幅衰減。喺香港嘅細單位（400 呎以下），一個好嘅傳統路由器通常已經夠用。但如果你住嘅係 600 呎以上嘅單位，或者屋企有好多間隔、厚牆，單一路由器好可能覆蓋唔晒。

A traditional router broadcasts WiFi from a single central point. Signal strength decreases with distance and degrades significantly when passing through walls, furniture, and other obstacles. In smaller Hong Kong flats (under 400 sq ft), a good traditional router is usually sufficient. But if you live in a unit over 600 sq ft, or if your home has many partitions and thick walls, a single router may not provide full coverage.

WiFi 延伸器 / 放大器 Range Extender / Repeater

WiFi 延伸器係將主路由器嘅訊號接收後再重新發射，表面上擴大咗覆蓋範圍。但佢有幾個明顯缺點：第一，延伸器會將速度減半，因為佢要同時接收同發射訊號（用同一個頻道）；第二，你通常要手動切換 WiFi 名稱（例如「Home_WiFi」同「Home_WiFi_EXT」）；第三，佢同主路由器之間嘅連接質素好受距離影響。所以行內人一般都唔推薦延伸器，因為佢係治標唔治本嘅方案。

A range extender receives the main router's signal and rebroadcasts it, seemingly expanding coverage. But it has several notable downsides. First, extenders halve your speed because they must receive and transmit on the same channel simultaneously. Second, you often have to manually switch WiFi names (e.g., "Home_WiFi" and "Home_WiFi_EXT"). Third, the connection quality between the extender and main router is heavily affected by distance. Industry professionals generally advise against extenders -- they treat the symptom, not the cause.

Mesh WiFi 系統 Mesh WiFi System

Mesh 系統完美解決咗以上兩者嘅問題。每個節點都係一個完整嘅路由器，佢哋之間有專用嘅通訊頻道（backhaul），唔會佔用你嘅正常上網頻寬。所有節點共用同一個 WiFi 名稱，裝置可以無縫切換。最重要嘅係，Mesh 系統設計上就係為咗多節點協作而生，軟件會智能地分配流量同優化路徑。

Mesh systems elegantly solve the problems of both traditional routers and extenders. Each node is a full router in its own right, and they communicate over a dedicated channel (backhaul) that does not eat into your regular browsing bandwidth. All nodes share one WiFi name, and devices switch seamlessly. Most importantly, mesh systems are designed from the ground up for multi-node cooperation, with software that intelligently distributes traffic and optimizes paths.

你需要 Mesh WiFi 嗎？When Do You Need Mesh WiFi?

香港嘅住宅面積普遍介乎 400 至 1,200 平方呎。雖然同外國嘅獨立屋相比細好多，但香港樓宇有一個特別嘅挑戰：鋼筋混凝土牆。好多香港嘅住宅大廈用嘅係高密度混凝土結構，加上間隔牆可能含有鋼筋，對 WiFi 訊號嘅衰減比外國嘅木架石膏板牆嚴重得多。所以就算係一個 500 呎嘅兩房單位，如果路由器放喺客廳，WiFi 訊號去到主人房都可能已經好弱。

Hong Kong residential flats typically range from 400 to 1,200 square feet. Though much smaller than standalone houses overseas, HK buildings present a unique challenge: reinforced concrete walls. Many residential towers use high-density concrete structures with steel-reinforced partition walls, which attenuate WiFi signals far more severely than the timber-frame drywall common overseas. So even in a 500 sq ft two-bedroom unit, if the router sits in the living room, WiFi signal reaching the master bedroom may already be quite weak.

以下情況建議考慮 Mesh WiFi：你嘅單位超過 500 呎且有兩間或以上嘅房間；你經常喺特定房間收到弱訊號或者成日斷線；你同時有好多裝置連接 WiFi（例如手機、平板、智能電視、遊戲機、智能家居設備）；你需要喺屋企唔同位置進行視像會議或者串流 4K 影片。

Consider mesh WiFi if: your unit is over 500 sq ft with two or more bedrooms; you frequently get weak signal or dropouts in certain rooms; you have many devices simultaneously connected (phones, tablets, smart TVs, gaming consoles, smart home devices); or you need reliable video conferencing or 4K streaming from different rooms.

香港熱門 Mesh WiFi 系統 | Popular Mesh Systems in HK

TP-Link Deco 系列

TP-Link Deco 係香港最受歡迎嘅 Mesh 系統之一，主要因為性價比極高。入門級嘅 Deco M5 兩件裝約 HK$600-800，已經可以覆蓋大約 700-900 呎嘅單位。進階嘅 Deco X50 或 X55 支援 WiFi 6，三件裝覆蓋可達 1,500 呎以上，價格約 HK$1,200-1,800。最新嘅 Deco XE75 支援 WiFi 6E，新增 6GHz 頻段做 backhaul，減少干擾。TP-Link Deco 嘅 App 介面簡單直觀，適合唔太熟科技嘅用家。

TP-Link Deco is one of the most popular mesh systems in Hong Kong, thanks to its exceptional value. The entry-level Deco M5 two-pack costs around HK$600-800 and covers roughly 700-900 sq ft. The more advanced Deco X50 or X55 supports WiFi 6, and a three-pack covers over 1,500 sq ft for about HK$1,200-1,800. The latest Deco XE75 supports WiFi 6E, adding a 6GHz band for backhaul to reduce interference. The Deco app interface is simple and intuitive, making it suitable for less tech-savvy users.

Netgear Orbi 系列

Netgear Orbi 走高端路線，最大嘅優勢係佢有專用嘅 5GHz backhaul 頻段。以 Orbi RBK752 為例，佢預留咗一條 5GHz 頻段專門俾節點之間通訊，唔會同你嘅裝置爭頻寬，所以性能好穩定。旗艦級嘅 Orbi 970 系列更支援 WiFi 7 同 10GbE 有線端口。缺點係價格偏貴，兩件裝 RBK752 約 HK$3,000-4,000，WiFi 7 版本更加貴。適合追求極致性能、預算充裕嘅用家。

Netgear Orbi targets the premium segment. Its biggest advantage is a dedicated 5GHz backhaul band. The Orbi RBK752, for example, reserves a 5GHz band exclusively for inter-node communication, so it never competes with your devices for bandwidth, resulting in very stable performance. The flagship Orbi 970 series even supports WiFi 7 and 10GbE Ethernet ports. The downside is price -- a two-pack RBK752 runs about HK$3,000-4,000, and WiFi 7 models cost even more. Best suited for users who demand peak performance and have the budget for it.

Google Nest WiFi (Pro)

Google Nest WiFi Pro 支援 WiFi 6E，設計簡約美觀，好適合注重家居美感嘅用家。佢嘅 App 整合咗 Google Home 生態系統，如果你屋企有 Google 智能助手或其他 Google 產品，用起嚟會特別方便。三件裝約 HK$2,500-3,500，覆蓋約 1,200-1,500 呎。不過要留意嘅係，Google Nest WiFi 嘅進階設定選項比較少，唔太適合鍾意自己調校設定嘅進階用家。

Google Nest WiFi Pro supports WiFi 6E and features a sleek, minimalist design that suits aesthetics-conscious homeowners. Its app integrates with the Google Home ecosystem, making it especially convenient if you already have Google smart assistants or other Google products. A three-pack costs about HK$2,500-3,500 and covers roughly 1,200-1,500 sq ft. Note, however, that Google Nest WiFi offers limited advanced settings, so it is less suitable for power users who like to fine-tune their configurations.

ASUS ZenWiFi 系列

ASUS ZenWiFi 以功能豐富見稱。ZenWiFi XT8 / XT9 支援 AiMesh 技術，可以同其他 ASUS 路由器組成 Mesh 網絡。佢提供完整嘅 AiProtection 安全防護（由 Trend Micro 提供技術），內建 VPN 伺服器、流量分析等進階功能。兩件裝約 HK$2,500-3,500。最新嘅 ZenWiFi BQ16 Pro 更支援 WiFi 7。ASUS 嘅韌體更新頻率高，長遠支援表現良好。

ASUS ZenWiFi stands out for its rich feature set. The ZenWiFi XT8/XT9 supports AiMesh technology, which lets you integrate other ASUS routers into a mesh network. It includes comprehensive AiProtection security (powered by Trend Micro), built-in VPN server, traffic analysis, and other advanced features. A two-pack costs about HK$2,500-3,500. The latest ZenWiFi BQ16 Pro supports WiFi 7. ASUS has a strong track record of frequent firmware updates and long-term support.

Linksys Velop 系列

Linksys Velop 係市場上最早期嘅 Mesh 系統之一，口碑穩定。Velop MX5300 支援 WiFi 6 同 tri-band 設計。Linksys 亦有較平價嘅 Velop WHW01 系列供入門用家選擇。整體來講，Linksys 喺香港嘅市場份額比上述品牌少，但如果你偏好美國品牌同穩定表現，值得考慮。

Linksys Velop was one of the earliest mesh systems on the market and has a solid reputation. The Velop MX5300 supports WiFi 6 with a tri-band design. Linksys also offers the more affordable Velop WHW01 series for entry-level users. Overall, Linksys has a smaller market share in Hong Kong compared to the brands above, but if you prefer an established American brand with stable performance, it is worth considering.

需要幾多個節點？How Many Nodes Do You Need?

以上只係參考數字，實際需要視乎你嘅間隔同牆壁材質。如果你嘅單位係開放式設計（open-plan），需要嘅節點會少啲。相反，如果有好多實牆間隔、洗手間同廚房嘅磁磚牆，每道牆都會令訊號衰減 30-50%，呢種情況就可能需要多啲節點。建議先買兩個節點嘅套裝，試用後再決定係咪需要加。大部分 Mesh 系統都支援隨時加入新節點。

The figures above are guidelines only -- your actual needs depend on layout and wall materials. Open-plan units require fewer nodes. Conversely, if your flat has many solid walls, or tiled bathroom and kitchen walls, each barrier can attenuate signal by 30-50%, meaning you may need more nodes. A good approach is to start with a two-node pack, test it, and add more if needed. Most mesh systems let you add nodes at any time.

Backhaul 解析：無線 vs 有線 | Backhaul Explained: Wireless vs Wired

Backhaul 係 Mesh 節點之間嘅通訊通道。你可以理解為節點之間嘅「高速公路」。Backhaul 嘅質素直接影響整個 Mesh 網絡嘅速度同穩定性。

Backhaul is the communication channel between mesh nodes. Think of it as the "highway" connecting your nodes. Backhaul quality directly impacts the speed and stability of your entire mesh network.

無線 Backhaul (Wireless Backhaul)

大部分 Mesh 系統預設用無線 backhaul。Dual-band 系統（例如 TP-Link Deco M5）用 5GHz 頻段做 backhaul，但呢條頻段同時要服務你嘅裝置，所以速度會打折扣。Tri-band 系統（例如 Netgear Orbi、ASUS ZenWiFi XT9）會預留一條獨立嘅 5GHz 頻段專門做 backhaul，性能明顯優勝。WiFi 6E 或 WiFi 7 嘅 Mesh 系統更可以用 6GHz 頻段做 backhaul，由於 6GHz 頻段暫時好少裝置使用、干擾極低，效果最理想。

Most mesh systems default to wireless backhaul. Dual-band systems (e.g., TP-Link Deco M5) use the 5GHz band for backhaul, but this same band also serves your devices, so speed is compromised. Tri-band systems (e.g., Netgear Orbi, ASUS ZenWiFi XT9) dedicate a separate 5GHz band exclusively to backhaul, delivering noticeably better performance. WiFi 6E or WiFi 7 mesh systems can use the 6GHz band for backhaul -- since very few devices currently use 6GHz and interference is minimal, this delivers the best results.

有線 Backhaul (Wired / Ethernet Backhaul)

如果你嘅屋企已經有埋線（網絡線 / LAN 線），你可以用 Ethernet 線將各個 Mesh 節點連接起嚟。有線 backhaul 係所有方案中最快、最穩定嘅，因為完全唔受無線干擾影響。好多香港嘅新樓盤都有預埋 Cat 5e 或 Cat 6 網絡線到每間房，呢種情況用有線 backhaul 就最理想。設定好簡單：只要用 LAN 線將每個節點接駁到屋企嘅網絡面板，Mesh 系統通常會自動偵測到有線連接並優先使用。

If your home already has Ethernet cabling, you can connect mesh nodes via Ethernet cables. Wired backhaul is the fastest and most stable option because it is completely immune to wireless interference. Many newer Hong Kong developments come pre-wired with Cat 5e or Cat 6 Ethernet to each room -- this is the ideal scenario for wired backhaul. Setup is straightforward: simply connect each node to your home's network panel with a LAN cable, and the mesh system will typically auto-detect the wired connection and prioritize it.

香港屋企安裝 Mesh WiFi 技巧 | Setup Tips for HK Apartments

1. 主節點放喺光纖入線位置附近：大部分香港住宅嘅光纖入線位置喺客廳或走廊嘅弱電箱。將主節點（連接寬頻 modem 嘅嗰個）放喺呢度，然後再喺其他房間放衛星節點。

1. Place the primary node near the fibre entry point: In most HK homes, the fibre enters at the utility box in the living room or hallway. Position the primary node (the one connected to your broadband modem) here, then place satellite nodes in other rooms.

2. 節點唔好放地下：將節點放喺檯面或者架上面（離地至少 1 米），訊號會好好多。避免放喺地下或者電視櫃入面。

2. Do not place nodes on the floor: Position nodes on a desk or shelf (at least 1 metre above the floor) for much better signal. Avoid placing them on the floor or inside TV cabinets.

3. 節點之間唔好隔太多牆：理想情況係每兩個節點之間最多隔一道牆。如果中間隔咗兩道或以上嘅混凝土牆，考慮加多一個中繼節點。

3. Minimize walls between nodes: Ideally, have no more than one wall between any two nodes. If two or more concrete walls separate them, consider adding an intermediate node.

4. 遠離大型金屬物件同電器：雪櫃、微波爐、金屬架等會嚴重干擾 WiFi 訊號。節點同呢啲物件保持至少 1-2 米距離。

4. Keep away from large metal objects and appliances: Refrigerators, microwaves, and metal shelving severely interfere with WiFi signals. Maintain at least 1-2 metres between nodes and such objects.

5. 善用 App 測試訊號：大部分 Mesh 系統嘅 App 都有「訊號強度測試」或「節點健康檢查」功能，安裝完之後用呢個功能確認每個節點之間嘅連接質素。如果顯示連接差，嘗試調整節點位置。

5. Use the app to test signal: Most mesh system apps include a "signal strength test" or "node health check" feature. After setup, use this to verify connection quality between nodes. If it shows a poor connection, try repositioning the nodes.

Mesh WiFi vs Access Points（AP）| Mesh vs Access Points

如果你嘅屋企已經有完善嘅網絡佈線（每間房都有 LAN 線），另一個選擇係用 Access Points（AP）取代 Mesh。AP 方案通常係一個主路由器加上幾個 AP 裝置，每個 AP 都用有線連接到主路由器。好處係性能最穩定、延遲最低。品牌方面，Ubiquiti UniFi 係最受歡迎嘅專業 AP 品牌，TP-Link Omada 係較平價嘅替代方案。

If your home already has comprehensive Ethernet wiring (LAN cables to each room), another option is Access Points (APs) instead of mesh. An AP setup typically involves one main router plus several AP devices, each wired back to the router. The advantage is maximum stability and lowest latency. Ubiquiti UniFi is the most popular professional AP brand, while TP-Link Omada offers a more budget-friendly alternative.

不過，AP 方案嘅設定比較複雜，通常需要一定嘅網絡知識，例如 VLAN 設定、PoE 供電等。對於一般家庭用家，Mesh WiFi 嘅「即插即用」體驗明顯更友好。如果你嘅需求係簡單易用、唔想花太多時間設定，Mesh 係更好嘅選擇。如果你追求極致性能同有網絡知識背景，AP 方案值得考慮。

However, AP setups are more complex and typically require networking knowledge -- VLAN configuration, PoE power supply, and so on. For typical home users, mesh WiFi's plug-and-play experience is clearly more user-friendly. If you want simplicity and minimal configuration time, mesh is the better choice. If you demand peak performance and have a networking background, APs are worth considering.

成本比較 | Cost Comparison

揀 Mesh 系統嘅時候唔好淨係睇初始成本。要考慮嘅仲有：日後加節點嘅成本、系統嘅持續更新支援、以及電費（Mesh 節點 24 小時運作，每個節點功耗約 5-15W，一年電費每個節點大約 HK$40-120）。整體嚟講，一套中階 Mesh 系統嘅總持有成本同買一個高階傳統路由器相若，但覆蓋範圍同體驗明顯好過傳統方案。

When choosing a mesh system, do not only look at initial cost. Also consider: the cost of adding nodes later, ongoing firmware update support, and electricity (mesh nodes run 24/7, each consuming about 5-15W, costing roughly HK$40-120 per node per year). Overall, the total cost of ownership for a mid-range mesh system is comparable to a high-end traditional router, but the coverage and experience are markedly superior.

配合 ISP 路由器使用 | Using Mesh with ISP-Provided Routers

香港嘅寬頻供應商通常會提供一個路由器（有時係 ONT + 路由器一體機）。如果你想加裝 Mesh WiFi 系統，最建議嘅做法係將 ISP 提供嘅路由器設為「橋接模式」（Bridge Mode），然後由 Mesh 系統嘅主節點擔任路由器角色。咁做可以避免「雙重 NAT」（Double NAT）問題，減少網絡延遲同埋端口轉發嘅麻煩。

Hong Kong ISPs usually provide a router (sometimes an ONT-router combo unit). If you want to add a mesh WiFi system, the recommended approach is to set the ISP router to Bridge Mode and let the mesh system's primary node serve as your router. This avoids "Double NAT" issues, reducing network latency and port-forwarding complications.

如果你唔識點設定橋接模式，或者 ISP 唔支援（部分寬頻供應商會鎖定路由器設定），另一個方法係將 Mesh 主節點設為 AP 模式（Access Point Mode），直接插喺 ISP 路由器嘅 LAN 口。呢個方法簡單但會保留 Double NAT，對一般上網同串流影響唔大，但如果你需要開 VPN 或者做端口轉發就可能有問題。

If you are unsure how to set up Bridge Mode, or if the ISP does not support it (some providers lock down router settings), an alternative is to set the mesh primary node to AP Mode and plug it into the ISP router's LAN port. This is simpler but retains Double NAT. For general browsing and streaming it makes little difference, but VPN or port-forwarding may encounter issues.

實際速度預期 | Performance Expectations

用 Mesh WiFi 配合 1000M 光纖寬頻，你可以合理期望嘅 WiFi 速度大約如下：喺主節點附近（同一房間），WiFi 6 Mesh 可以達到 500-800Mbps；經過一道牆到衛星節點附近，大約 300-500Mbps；經過兩道牆到較遠嘅衛星節點，大約 150-300Mbps。使用有線 backhaul 或 WiFi 6E/7 backhaul 嘅系統，各個節點嘅速度會更加接近，差距更小。

With mesh WiFi on a 1000M fibre plan, reasonable WiFi speed expectations are roughly: near the primary node (same room), a WiFi 6 mesh can deliver 500-800Mbps; through one wall near a satellite node, about 300-500Mbps; through two walls at a more distant satellite node, about 150-300Mbps. Systems using wired backhaul or WiFi 6E/7 backhaul will show more consistent speeds across nodes with smaller drops.

WiFi 6 / 6E / 7 Mesh 系統點揀？| Choosing WiFi 6 vs 6E vs 7 Mesh

WiFi 6（802.11ax）：目前最主流嘅標準，大部分中階 Mesh 系統都係 WiFi 6。支援 OFDMA 同 MU-MIMO 技術，可以同時服務多個裝置。對於大部分香港家庭來講，WiFi 6 Mesh 已經非常夠用。

WiFi 6 (802.11ax): The current mainstream standard, used by most mid-range mesh systems. It supports OFDMA and MU-MIMO, serving multiple devices simultaneously. For most Hong Kong households, a WiFi 6 mesh is more than adequate.

WiFi 6E：新增 6GHz 頻段，提供更多唔擁擠嘅頻寬。最大嘅優勢係可以用 6GHz 做 backhaul，令節點之間嘅連接更快更穩定。適合家中裝置多、對速度要求高嘅用家。目前支援 WiFi 6E 嘅裝置越來越多，包括最新嘅 iPhone 同 Android 旗艦手機。

WiFi 6E: Adds the 6GHz band, offering more uncongested bandwidth. Its biggest advantage is using 6GHz for backhaul, making inter-node connections faster and more stable. Suitable for homes with many devices and high speed demands. More devices now support WiFi 6E, including the latest iPhones and Android flagships.

WiFi 7（802.11be）：最新嘅標準，支援 MLO（Multi-Link Operation）、320MHz 頻寬等技術，理論速度可達 46Gbps。不過目前 WiFi 7 Mesh 系統售價偏高，支援 WiFi 7 嘅裝置仍然唔多。如果你唔急住升級，建議再等一至兩年，等價格回落同裝置支援成熟再入手。

WiFi 7 (802.11be): The latest standard, supporting MLO (Multi-Link Operation), 320MHz channel width, and theoretical speeds up to 46Gbps. However, WiFi 7 mesh systems are currently expensive, and devices supporting WiFi 7 remain limited. If you are not in a rush to upgrade, it may be worth waiting one to two years for prices to drop and device support to mature.