Differential feed half-wave length antenna with harmonic suppression function

Abstract

The invention discloses a differential feed half-wave length antenna with a harmonic suppression function. Two matched attenuation networks are arranged on the symmetric lines of two feed points on the differential feed half-wave length antenna; the two matched attenuation networks are connected with horizontal edges of an upper radiation patch respectively; and four rectangular complementary split ring resonators are arranged at the place 0.2 to 0.8mm far away from the outsides of two horizontal edges of the upper radiation patch and L / 3 far away from the symmetric lines of the two feed points of the antenna, wherein L is a half-wave length; c is a light velocity of a free space; epsilon eff is an effective dielectric constant of the differential feed half-wave length antenna; and f is aworking frequency of the differential feed half-wave length antenna. The matched attenuation networks are used for absorbing the energy of a second harmonic, and the rectangular complementary split ring resonators are used for suppressing a third harmonic. The harmonics of the antenna of the invention can be suppressed and the effect on a fundamental frequency characteristic is extremely low. Thedifferential feed half-wave length antenna also has the characteristics of small volume, easy processing, low cost and the like.

Description

technical field [0001] The invention relates to a microwave antenna, in particular to a differential feeding half-wavelength antenna with harmonic suppression function, which can be applied to the fields of mobile communication, satellite communication, microwave communication, wireless sensor network and the like. Background technique [0002] In recent years, wireless communication systems have increasingly stringent requirements on antennas. Because of the advantages of small size, light weight, superior performance, low price and easy manufacturing, microstrip antennas have become the focus of satellite communications and wireless mobile communications. They are used to receive wireless signals in the air or transmit RF active circuits connected to them. signal of. In active radio frequency circuits, differential circuits are widely used in radio frequency integrated circuits (RFICs) and monolithic microwave integrated circuits (MMICs) due to their many advantages such ...

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Problems solved by technology

The above methods are to change the harmonic frequency to make it deviate from the integer multiple of the fundamental frequency, but the energy of the harmonic signal will also be radiated by the antenna; Y.J.Sung in "An Improved Design of Microstrip Patch Antennas Using Photonic Bandgap Structure" (IEEE Transactions On Antennas And Propagation, Vol.53, No.5, pp1799-1804, May 2005) proposes a microstrip antenna based on PBG structure, which reflects the harmonic signal from the input port of the antenna, but the PBG structure will introduce additional Insertion loss, thereby reducing the gain and efficiency of the antenna, and as Hyungrak pointed out in the article "Microstrip-Fed Slot Antennas With Suppressed Harmonics" (IEEE Transactions On Antennas And Propagation, Vol.53, No.9, pp2809-2817, May2005) , the above design does not provide sufficient rejection in the harmonic bandwidth

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