Microwave broadband decoupled network based on signal interference concept

Abstract

The invention provides a microwave broadband decoupled network based on a signal interference concept. According to the structure, removal of mutual coupling between coupled antennas serves as a design starting point, according to a signal interference method, two same broadband directional couplers are connected to serve as a guide-in path, mutual coupling energy of the antennas and energy of the guide-in path generate voltage zero points on a connecting line and then are offset, and therefore the broadband decoupled network is obtained. The decoupled network is of a plane micro-strip structure, and a dielectric slab is made of FR4. With the cooperation of thin film chip resistors, the structure is simple, machining is easy, cost and weight are low, and therefore large-scale production can be achieved. A novel technical scheme is provided for front end design of a broadband receiving and transmitting system, and the combination modes of microwave passive circuits are increased.

Description

technical field [0001] The invention relates to a microwave planar circuit for removing mutual coupling between antenna arrays placed in close distance, in particular to a coupler-based microwave broadband decoupling network. Background technique [0002] Advances in next-generation communication systems have created an urgent need for portable and compact terminals with channel capacity and throughput. In order to improve the channel capacity of the communication system, according to Shannon's theorem, one method is to widen the system bandwidth, which is applied to the third-generation mobile phones; another method is to use multiple-input multiple-output (MIMO) technology. Both ends use multiple antennas to increase channel capacity. Therefore, future high-capacity mobile terminals require compact broadband multi-antenna systems. For portable terminals, multiple antennas should be placed in a small space, so the distance between the antennas is much smaller than half a ...

AI Technical Summary

Problems solved by technology

The limitation of the first form is that the coupling antenna needs to be fine-tuned to meet the design specifications

For the second one, complex structures need to be designed on the ground plane

The disadvantage of lumped decoupling networks is their relatively narrow decoupling bandwidth due to the frequency-dependent nature of lumped elements

[0004] It can be seen from the above that the implementation methods of the prior art are difficult to apply to broadband antennas, and no corresponding explanation is given for the impact on the radiation pattern

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