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A choke ring antenna is commonly used in GNSS applications to minimize multipath interference. The radiating element inside is typically a microstrip patch antenna or a quadrifilar helix, rather than a dipole. Patch antennas are widely used due to their compact size, circular polarization, and good impedance matching with GNSS signals.
The signal is for RHCP antenna not linear. The ring has concentric groves to attenuate stronger lateral ground signals. The Helix is used to capture a wider sky view.
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