[Global Technology Reporter Wang Lilan] In addition to being judicially suspended, Trump’s young political career has faced huge social obstacles just after its start. The French International Radio reported on February 6 that from February 5 to 6 in Paris, a federal appeals court in the United States received a letter of application signed by 97 people. The 97 people came from Google, Facebook, Twitter, and Apple. And Microsoft and others, the letter sue Trump to prohibit the entry of citizens of seven countries, "seriously damaged the US trade, innovation and development." As of now, more than a hundred companies have resorted to legal channels for Trump's immigration ban.
In addition to major high-tech companies, the joint name includes Airbnb, EBay, Intel, LinkedIn, Netflix, and Uber.
It is reported that on January 27, US President Trump signed a decree banning the entry of citizens of Iran, Iraq, Libya, Somalia, Sudan, Syria, and Yemen, which was temporarily suspended on February 3. According to the high-tech practitioners' joint letter, Trump’s immigration ban will cause a large number of elites to lose from the United States, and foreign investment will also be affected by amputation.
The joint letter denounced Trump for making the employment of US companies more difficult, and the cradle of US high-tech companies in the Silicon Valley was most strongly affected by the immigration law.
According to reports, according to a statistic at the beginning of this month, 53% of U.S. respondents were opposed to Trump’s new immigration ban and agreed to voice 47%. In this regard, Trump himself claimed that these investigations were not credible, just as it was not possible to predict that he would be able to take office.
Sector Panel Antennas, also known as sectorized antennas or directional panel antennas, are a crucial component in modern wireless communication systems. These antennas are designed to provide highly directional radiation patterns, enabling efficient coverage of specific sectors within a broader communication area. Their versatility and performance make them ideal for a wide range of applications, including cellular networks, public safety communications, and wireless broadband systems.
Classification Based on Coverage
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Single-Sector Panel Antennas:
- These antennas are configured to cover a single, narrow sector of the overall communication area. They are typically used in smaller networks or as supplemental coverage in larger systems.
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Multi-Sector Panel Antennas:
- Multi-sector panel antennas consist of multiple panels or elements arranged in a way that divides the overall coverage area into multiple distinct sectors. Each sector can be individually optimized and controlled, providing greater flexibility and coverage control. These antennas are commonly found in cellular base stations, where they are used to cover a larger geographical area efficiently.
Classification Based on Frequency Bands
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Low-Band Sector Panel Antennas:
- Designed to operate in lower frequency bands (e.g., 600 MHz to 2.6 GHz), these antennas excel at providing deep indoor penetration and wide-area coverage. They are particularly useful in rural and suburban areas where signal propagation can be challenging.
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Mid-Band Sector Panel Antennas:
- Operating in mid-range frequency bands (e.g., 2.5 GHz to 3.7 GHz), these antennas offer a balance between coverage and capacity. They are commonly used in urban and suburban areas, supporting a mix of voice and data traffic.
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High-Band Sector Panel Antennas:
- Operating in higher frequency bands (e.g., 3.5 GHz to 5G+ frequencies), these antennas enable high-speed data transmission with reduced latency. They are increasingly being deployed in dense urban environments and for specialized applications such as mmWave 5G networks.
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