Design method of broadband miniaturized VICTS antenna feed network

Abstract

The invention discloses a design method of a broadband miniaturized VICTS antenna feed network, which comprises the following steps: determining the hierarchy of a power division network according tothe transverse size of a feed network, and determining the number of T-shaped junctions according to the hierarchy of the power division network and the longitudinal size of the feed network; analyzing a field mode propagated in the waveguide, calculating a main mode starting frequency and a main mode ending frequency, establishing a miniaturized T-junction model, and establishing a relationship between a T-junction structure parameter and a reflection coefficient; adopting a broadband technology to design a broadband and miniaturized T-junction, and adopting a full-wave analysis method to extract the relationship between the broadband T-junction and a reflection coefficient; The amplitude and the phase of the T-junction are adjusted, so that the T-junction meets the in-phase excitation output of specific power distribution; and designing a port conversion module and a transition matching and polarization adjusting module, and checking related indexes of the excitation source to reachset indexes. Effective compression of the longitudinal size of the feed network is achieved, in-phase output is achieved within the required frequency band range, meanwhile, the amplitude is accurately controlled, and therefore the gain and standing wave characteristics of the antenna are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of satellite communication antennas, in particular to a design method for a VICTS antenna broadband feed network. Background technique [0002] The VICTS (Variable Inclination Continuous Transverse Stub) array antenna is developed from the CTS (Continuous Transverse Stub) array antenna. The antenna consists of an excitation source and a parallel plate waveguide. The excitation source is composed of port conversion module, feed network module, transition matching and polarization adjustment module, and the parallel plate waveguide is composed of convex branch, slow wave, support structure and so on. The main part of the antenna excitation source is the feed network. The basic requirement of the VICTS antenna for the feed network is: to realize the in-phase power combination / distribution of a specific amplitude distribution (equal amplitude distribution / unequal amplitude distribution) under the given horizonta...

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Problems solved by technology

[0005] Aiming at the problem that the excitation source cannot be placed on the same layer as the slow wave structure and the bandwidth is narrow when the aperture ratio of the VICTS antenna is limited, the present invention provides a design method for a broadband miniaturized VICTS antenna feed network

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