CN2167477Y

CN2167477Y - Twisted pair radio frequency quadrature bridge

Info

Publication number: CN2167477Y
Application number: CN 93223721
Authority: CN
Inventors: 陈兆武
Original assignee: Jizhao Electronic Co ltd Beijing
Current assignee: Jizhao Electronic Co ltd Beijing
Priority date: 1993-09-10
Filing date: 1993-09-10
Publication date: 1994-06-01
Anticipated expiration: 2003-09-10

Abstract

The utility model belongs to the field of the structure design of radio frequency quadrature bridge, which is composed of a mutual coil, a coupling capacitance and a grounded capacitance between a self-induction coil and a terminal. In addition, the coupling capacitance and a grounded capacitance are symmetrically distributed with the mutual coil. The utility model is characterized in that the mutual coil is composed of twisted wire coils. The utility model does not have additional loss which is generated by the introduction of a magnetic loop, and the utility model has the advantages of small size, and compact structure, and the utility model is especially suitable for being used in high-power occasions and solid power amplification circuits.

Description

Twisted pair radio frequency quadrature bridge

The utility model belongs to the quadrature bridge structure-design technique field of radio frequency band.

Quadrature bridge is widely used at radio frequency band, generally adopting the quadrature bridge of line transformer form or distributed constant form in the circuit such as frequency mixer, modulator, balance amplifier, power divider and power combiner.The weak point of the quadrature bridge of line transformer form is to need a ferrite bead, and this magnet ring can be introduced supplementary load loss, and it is restricted in the use of large-power occasions; The quadrature bridge of distributed constant form is big in the radio frequency band size, uses inconvenient.

The purpose of this utility model is to overcome the weak point of above-mentioned prior art, designs a kind of novel rope-lay conductor radio frequency orthogonal electric bridge, makes it have following advantage: 1, the supplementary load loss of no magnet ring introducing can be used for large-power occasions; 2, size is little, and compact conformation is applicable in the synthetic amplifying circuit of solid state power.

The rope-lay conductor radio frequency orthogonal electric bridge of the utility model design, by mutual inductor, and this mutual inductor self-induction coil, the coupling capacitance between the terminal, the ground capacity that are symmetrically distributed formed, it is characterized in that said mutual inductor is made of the rope-lay conductor coil, said rope-lay conductor coil, coupling capacitance, ground capacity all are welded on to apply in the copper printed board and with microwave transmission line and are interconnected.The utility model is used under the working frequency range condition with higher, because the existing self-induction composition of rope-lay conductor coil itself, so can save self-induction coil, above-mentioned said microwave transmission line can use microstrip line, strip line, coaxial line or co-planar waveguide to realize.

The utility model circuit theory is as described below, radiofrequency signal enters quadrature bridge by input port 1, by delivery outlet 2 and 4 outputs, output level amplitude approximately equal, phase of output signal differs from two signals of 90 ° respectively from the 2nd mouthful and the 4th mouthful of input, from the 1st mouthful of synthetic output.

Brief Description Of Drawings:

Fig. 1 is a kind of example structure schematic diagram of the present utility model

The utility model proposes a kind of rope-lay conductor radio frequency orthogonal electric bridge embodiment, its structure as shown in Figure 1, rectangle is applied and to be corroded the zone of being decorated with oblique line among many deposited copper pasters becoming symmetry such as the figure in the copper printed board, wherein, four ground patch 11～14 are arranged respectively around the printed board, in the middle of the printed board four little band lead-in wire pasters 21～24, four terminations of rope-lay conductor mutual inductor M are welded on it respectively, article four, the little band lead-in wire 31～34 of L type is symmetrically distributed, termination coupling capacitance C2 and ground capacity C1 are symmetrically welded on it respectively, article four, an end of the little band lead-in wire of L type constitutes three input/

output ports

1,2,3, four self-induction coil one ends of 4 and isolated ports are welded on respectively on four little band lead-in wires of L type, and the other end is welded on four little band lead-in wire pasters 21～24.Isolated port welds an isolator build-out resistor R.

Present embodiment physical dimension and component parameter are as follows:

Printed board is 200 * 30mm, and little band lead-in wire paster width is 4mm.

The mutual inductance of rope-lay conductor mutual inductor is 174nh, and the self-induction of self-induction coil L is 51nh,

Coupling capacitance C2 is 14pf, and ground capacity C1 is 5.1pf,

The isolator build-out resistor is 50 Ω.

Present embodiment centre frequency: 170MHz

Relative bandwidth: Insertion Loss :≤0.5dB in 〉=45% band

Output amplitude degree of unbalance :≤0.5dB

Output phase degree of unbalance :≤2 °

Input vswr :≤1.5

Claims

1, a kind of rope-lay conductor radio frequency orthogonal electric bridge, by mutual inductor, and this mutual inductor self-induction coil, the coupling capacitance between the terminal, the ground capacity that are symmetrically distributed formed, it is characterized in that said mutual inductor is made of the rope-lay conductor coil, said rope-lay conductor coil, coupling capacitance and ground capacity all are welded on to apply in the copper printed board and with microwave transmission line and are interconnected.

2, quadrature bridge as claimed in claim 1 is characterized in that said microwave transmission line can use microstrip line, strip line, coaxial line or co-planar waveguide to realize.