Dual-frequency antenna, dual-polarized dual-frequency antenna and preparation method of isolation element

Abstract

The invention relates to a dual-frequency antenna comprising a feed unit, a transmission line and a radiation arm unit which are electrically connected in sequence. The radiation arm unit comprises an internal radiation unit including a first and second high frequency radiation arm, an external radiation unit including a first and second low frequency radiation arm, and two isolation elements arranged between the internal and external radiation unit. One end of the internal radiation unit is connected with the transmission line, and the other end of the internal radiation unit is electrically connected with the external radiation unit through the isolation elements. Each isolation element has a parallel double-line structure with one end open-circuited or short-circuited, and two conductors forming the other end of the parallel double-line of the isolation element are respectively connected with a corresponding high frequency radiation arm and low frequency radiation arm. The dual-frequency antenna realizes high accuracy in transmission and batch consistency in production, improves the defects of an existing technical scheme, and has an advantage of small size.

Description

【Technical field】 [0001] The invention relates to the field of antenna design, in particular to a dual-frequency antenna, a dual-polarization dual-frequency antenna and a preparation method for an isolation element. 【Background technique】 [0002] Different communication systems require transmitting / receiving antennas with different frequency bands. Therefore, the antenna should be able to receive radio signals of multiple frequency bands to be applied to multiple communication systems. For transmitting / receiving radio signals at multiple frequencies, multiple single-frequency antennas or multi-frequency antennas operating on multiple frequencies can be used. However, in terms of improving the space utilization and operability of the communication system, using multi-frequency transmitting / receiving antennas is more beneficial to the integrated design of the communication system than using multiple single-frequency transmitting / receiving antennas. [0003] Patent document C...

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Problems solved by technology

[0006] If the scheme of the above literature is applied to the high frequency band (such as the mobile communication 700MHz ~ 2700MHz frequency band), because the inductance coil will produce the combined effect of parasitic bypass capacitance and equivalent series resistance in the high frequency band, and the capacitance will also have parasitic bypass inductance in the high frequency band And series resistance effect, and there are differences in the welding process of components. These non-ideal parasitic effects and resistance effects will lead to deviations between actual parameters and ideal parameters, affecting design accuracy, and it is difficult to ensure batch consistency of products

[0007] Patent document CN201320047905 proposes a passive detection antenna vibrator, which mainly includes a connecting block, a U-shaped bracket, an antenna receiving core, an extruded block, and left and right antenna receiving ends. The left and right antenna receiving ends are made of circular tinned aluminum rods. Connected and fixed on the U-shaped bracket, it improves the receiving area of ​​electromagnetic wave signals and effectively reduces the signal-to-noise ratio. However, this kind of detection antenna only works in a single frequency band. When it is applied to a multi-frequency system, it needs to be tested in a single test system. Installing multiple probing antennas increases the complexity of the test system

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