* For the emerging FR3 range (7–24 GHz), wavelengths range from roughly 4.3 cm (at 7 GHz) down to 1.25 cm (at 24 GHz).
* Holes in the shield (spacing between metal shavings) must be smaller than the wavelength to be effective.
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𝗖𝗼𝗻𝘁𝗲𝘅𝘁:
The Philippines has indicated its intent to join the 6.425–7.125 GHz band for IMT-2030 (6G) by 2027, aligning with other Asian nations. This band is critical for 6G development, balancing coverage and capacity.
Key spectrum considerations for 6G in the Philippines include:
𝙐𝙥𝙥𝙚𝙧 𝙈𝙞𝙙-𝘽𝙖𝙣𝙙 (𝙁𝙍3): Frequencies between 7–24 GHz are emerging as focal points for 6G, offering a compromise between sub-6 GHz coverage and millimeter-wave capacity.
𝙁𝙪𝙩𝙪𝙧𝙚 𝘼𝙡𝙡𝙤𝙘𝙖𝙩𝙞𝙤𝙣𝙨: The 7.125–15.35 GHz range is slated for study at the WRC-27 (World Radiocommunication Conference 2027) to secure availability for 6G coverage.
Current 5G Bands: The Philippines is planning to assign 3.6–4.0 GHz (with temporary testing in 3.7–3.8 GHz) as a foundation for future 6G evolution.
𝙍𝙚𝙜𝙖𝙧𝙙𝙞𝙣𝙜 𝙬𝙖𝙫𝙚𝙡𝙚𝙣𝙜𝙩𝙝, the 6.425–7.125 GHz band corresponds to a wavelength of approximately 4.2 to 4.7 centimeters (calculated as $c/f$, where $c \approx 3 \times 10^8$ m/s).
𝗙𝗼𝗿 𝘁𝗵𝗲 𝗲𝗺𝗲𝗿𝗴𝗶𝗻𝗴 𝗙𝗥𝟯 𝗿𝗮𝗻𝗴𝗲 (𝟳–𝟮𝟰 𝗚𝗛𝘇), 𝘄𝗮𝘃𝗲𝗹𝗲𝗻𝗴𝘁𝗵𝘀 𝗿𝗮𝗻𝗴𝗲 𝗳𝗿𝗼𝗺 𝗿𝗼𝘂𝗴𝗵𝗹𝘆 𝟰.𝟯 𝗰𝗺 (𝗮𝘁 𝟳 𝗚𝗛𝘇) 𝗱𝗼𝘄𝗻 𝘁𝗼 𝟭.𝟮𝟱 𝗰𝗺 (𝗮𝘁 𝟮𝟰 𝗚𝗛𝘇).
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𝗠𝗲𝘁𝗵𝗼𝗱𝘀 𝘁𝗼 𝗗𝗶𝘀𝗿𝘂𝗽𝘁 𝗪𝗮𝘃𝗲𝘀
𝘿𝙚𝙨𝙩𝙧𝙪𝙘𝙩𝙞𝙫𝙚 𝙄𝙣𝙩𝙚𝙧𝙛𝙚𝙧𝙚𝙣𝙘𝙚: Generate a new wave with the same frequency and wavelength but with inverted amplitude (opposite phase). When this wave overlaps with the original, they cancel each other out. This is how noise-canceling headphones work for sound, but it is difficult for radio waves because you cannot process and emit the counter-wave faster than the electromagnetic wave travels.
𝙎𝙝𝙞𝙚𝙡𝙙𝙞𝙣𝙜 𝙖𝙣𝙙 𝘼𝙗𝙨𝙤𝙧𝙥𝙩𝙞𝙤𝙣: Use materials that reflect or absorb the wave energy. Conductive materials like aluminum foil or copper mesh (Faraday cages) block radio waves by reflecting them or inducing currents that dissipate the energy. Holes in the shield must be smaller than the wavelength to be effective.
𝙅𝙖𝙢𝙢𝙞𝙣𝙜: Emit high-power noise or random signals on the same frequency to degrade the signal-to-noise ratio, making the original signal unintelligible. This disrupts communication rather than physically canceling the wave.
