Ultra-wideband Balun based on new interconnection structure

Abstract

The present invention provides an ultra-wideband Balun based on a new interconnection structure. The ultra-wideband Balun includes a rectangular dielectric substrate. A T-junction power divider, a coplanar stripline, a two-port output terminal microstrip band, and a three-port output terminal microstrip band are arranged on the front of the dielectric substrate. A two-port output terminal microstrip floor, a three-port output terminal microstrip floor, a coplanar wave guide, and an input terminal microstrip floor are arranged on the back of the dielectric substrate. Multiple round metal through holes are arranged inside the dielectric substrate and are used for connecting devices on the front and back of the dielectric substrate. The ultra-wideband Balun based on the new interconnection structure has a small size, a compact circuit structure, low insertion loss, and a good output port matching feature.

Description

technical field [0001] The invention belongs to the technical field of microwave passive devices, and in particular relates to an ultra-wideband balun based on a novel interconnection structure. Background technique [0002] In the field of antennas, the dipole antenna is a balanced antenna, so a balun is needed to convert the unbalanced signal into a balanced signal to feed the balanced antenna. Baluns are baluns that provide equal-amplitude reverse signals as well as impedance matching. At present, the most common signal transmission line in microwave integrated circuits is microstrip line, which transmits unbalanced signals, while coplanar waveguide and coplanar stripline are single-sided transmission lines, which are small in size, easy to integrate, and easy to realize with microstrip structure. Features such as broadband interconnection structure. Based on this background, we use microstrip-coplanar waveguide and microstrip-coplanar stripline to realize an ultra-wide...

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Problems solved by technology

[0004] Document 1 (Vicente González-Posadas, Carlos Martín-Pascual, José Luis Jiménez-Martín, and Daniel Segovia-Vargas, Lumped-elementbalunforUHFUWBprintedbalancedantennas, IEEETransactionsonantennaandpropagation, 2008, 56, (7): 2102-2107 presented in the low-pass unit structure and high-pass unit respectively) Capacitive and inductive, so that through appropriate parallel measures, the phase reversal characteristics of the two output ports can be obtained, but the balun is based on semi-lumped components, it is difficult to achieve wide bandwidth, and the insertion loss is large

[0005] Document 2 (PengWu, YongZhang, Yu-LiangDong, and QinZhang, AnovelKa-bandplanarbalunusingmicrostrip-CPS-microstriptransition, IEEEMicrowaveWirelessCompon.Lett., 2011, 21, (3): 136-138) uses two symmetrical microstrip lines-coplanar The stripline interconnection structure realizes a broadband balun, but the balun is relatively large in size and complex in structure

[0006] Document 3 (JinShao, RongguoZhou, ChangChen, Xiao-HuaWang, HyoungsooKim, and HualiangZhang, Designofawidebandbalunusingparallelstrips, IEEEMicrowaveWirelessCompon.Lett., 2013, 23, (3): 125-127) used a phase converter to realize a wideband balun. Good port matching characteristics, but larger balun size

[0007] To sum up, (1) the balun designed in Document 1 adopts the implementation method of semi-lumped components, and the loss of lumped components in the millimeter wave band is relatively low and makes the circuit inconvenient to process; (2) the balun designed in Document 2 The wideband balun has a large size and complex structure; (3) The wideband balun designed in Document 3 has the disadvantage of large size

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