CN104332687A

CN104332687A - Improved 2.4GHz LTCC power divider

Info

Publication number: CN104332687A
Application number: CN201410511825.XA
Authority: CN
Inventors: 郑琨
Original assignee: CETC 55 Research Institute
Current assignee: CETC 55 Research Institute
Priority date: 2014-09-29
Filing date: 2014-09-29
Publication date: 2015-02-04

Abstract

The invention provides an improved 2.4GHz LTCC power divider of which the structure comprises an input port P1, a first output port P2, a second output port P3, a first external side printing ground G1, a second external side printing ground G2, a third external side printing ground G3, an internal ground GND, a ground capacitor C1, an output parallel-connected capacitor C2, a first electric inductor L1, a second electric inductor L2, an isolation resistor R and a printing mark M. Working frequency range is 2.3GHz-2.5GHz, which covers all frequency range of 2.4GHz application. The circuit mode adopted by a common lumped parameter power divider is improved with respect to the structure so that the number of elements is effectively reduced, element value is reduced, and thus the power divider is enabled to be more suitable for batch production of miniaturized devices. The improved 2.4GHz LTCC power divider has substantial advantages of being compact in structure, small in size, high in output isolation, low in insertion loss, great in phase consistency and high in amplitude balance degree.

Description

Modified model 2.4GHz LTCC power divider

Technical field

The present invention relates to be a kind of 2.4GHz of covering application band have size little, export that isolation is high, insertion loss is little, phase equalization good, amplitude balance is high, be applicable to the modified model LTCC power divider of the advantages such as miniaturized batch of product, belong to microwave technical field.

Background technology

In recent years, due to the rise of portable communications product and the demand of high density IC encapsulation, LTCC technology is made to have more application space.Can be completely buried in medium by passive components such as electric capacity, inductance, transmission lines by LTCC technology, complete with the form of multilayer circuit, they more can make full use of three dimensions, open up new direction to the development of miniaturized three-dimensional microwave passive device.

Power splitter is widely used in RF/Microwave receiving and transmitting front end, as in the feeding network of array antenna, power splitter Ke Jiang mono-road signal is divided into the signal of multichannel constant amplitude homophase, equally also can be used in solid-state microwave amplifier, by multiple signal syntheses more powerful output signal.

Surface-mount type power splitter generally adopts lumped circuit, realize inductance, once the burning altogether of electric capacity in three dimensions, but adopt the power divider circuit that general lumped parameter form builds, number of elements is many and component value is larger, be unfavorable for integral miniaturization, certain difficulty is also brought to batch production.

Summary of the invention

What the present invention proposed is a kind of modified model 2.4GHz LTCC power divider, and its object is intended to the Development Status improving current miniaturization lumped parameter LTCC power divider, overcomes some problems wherein existed.

Technical solution of the present invention: its structure comprises an input port, first output port, second output port, first outer side print ground, second outer side print ground, the 3rd outer side print ground, internal ground, direct-to-ground capacitance, output-parallel electric capacity, first inductance, second inductance, isolation resistance, typographic(al) mark.

Advantage of the present invention: 1) compact conformation, size is little; 2) isolation is exported high; 3) insertion loss is little; 4) phase equalization is good, amplitude balance is high; 5) number of elements is few, component value is little, is applicable to miniaturized batch and produces.

Accompanying drawing explanation

Fig. 1 is the structure chart of modified model 2.4GHz LTCC power divider.

Fig. 2 is the circuit diagram of modified model 2.4GHz LTCC power divider.

Fig. 3 is the characteristic of VSWR curve chart of modified model 2.4GHz LTCC power divider.

Fig. 4 is the insertion loss performance diagram of modified model 2.4GHz LTCC power divider.

Fig. 5 is the isolation performance diagram of modified model 2.4GHz LTCC power divider.

Fig. 6 is the phase equalization performance diagram of modified model 2.4GHz LTCC power divider.

Fig. 7 is the amplitude balance performance diagram of modified model 2.4GHz LTCC power divider.

Embodiment

Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.

As shown in Figure 1, modified model 2.4GHz LTCC power divider, its structure comprises: input port P1, first output port P2, second output port P3, first outer side print ground G1, second outer side print ground G2, the 3rd outer side print ground G3, internal ground GND, direct-to-ground capacitance C1, output-parallel electric capacity C2, first inductance L 1, second inductance L 2, isolation resistance R, typographic(al) mark M.

Described first inductance L 1, second inductance L 2 all adopts three-dimensional spiral formula structure, inductance coil connection between layers completes with cylindrical via hole, the size of inductance value is adjusted by regulating each section of inductance line length, because this power splitter is point outputs such as two-way, therefore equal, the consistent size of the inductance value of first inductance L 1 and second inductance L 2, to the adjustment of its inductance value size, can synchronously carry out; Direct-to-ground capacitance C1 and output-parallel electric capacity C2 have employed the structure of metal-dielectric-metal form, regulates the size of its metal polar plate to change the size of its capacitance.

Isolation resistance R adopts printed resistor to make, inside be embedded among LTCC medium, be positioned at the top of output-parallel electric capacity C2 and its two ends, left and right connect with cylindrical hole with the two ends, left and right of output-parallel electric capacity C2 respectively, be connected across between first inductance L 1 and second inductance L 2.Because power splitter has certain requirement to isolation, therefore need to arrange suitable resistance.The control of printed resistor resistance has been come by its printing area and selected resistance slurry, in addition, due to this power splitter isolation resistance R be in be embedded among LTCC medium, later stage resistance trimming work is difficult to carry out, therefore, just need accurately to control it, to meet the demands in early stage.

As shown in Figure 2, the input of first inductance L 1 of modified model 2.4GHz LTCC power divider is connected with the input of second inductance L 2 and is connected to input port P1, and the output of first inductance L 1 and second inductance L 2 is connected to output port P3 and output port P2; The input of direct-to-ground capacitance C1 connects with input port P1; The two ends, left and right of output-parallel electric capacity C2 are connected to first inductance L 1 and second inductance L 2; Isolation resistance R is parallel to and exports between branch road.

As shown in Figure 3, the voltage standing wave ratio of modified model 2.4GHz LTCC power divider is less than 1.2 in working frequency range.

As shown in Figure 4, the insertion loss of modified model 2.4GHz LTCC power divider is less than 0.23dB(and has deducted power splitter self 3dB loss in working frequency range), energy loss is low.

As shown in Figure 5, the isolation of modified model 2.4GHz LTCC power divider is greater than 25.80dB in working frequency range, effectively can improve the antinoise signal crosstalk ability between device output end.

As shown in Figure 6, the phase equalization of modified model 2.4GHz LTCC power divider is less than 0.65 °, and phase equalization is good.

As shown in Figure 7, the amplitude balance of modified model 2.4GHz LTCC power divider is less than 0.01dB, and amplitude balance is good.

The working frequency range of power splitter is 2.3GHz ~ 2.5GHz, voltage standing wave ratio≤1.18 of input port P1, voltage standing wave ratio≤1.14 of output port P2, voltage standing wave ratio≤1.10 of output port P3, isolation >=25.80dB, insertion loss≤0.23dB, phase equalization≤0.65 °, amplitude balance≤0.01dB.

The overall dimensions of modified model 2.4GHz LTCC power divider is 3.2mm × 1.6mm × 0.84mm.

Claims

1. modified model 2.4GHz LTCC power divider, is characterized in that: comprise an input port (P1), first output port (P2), second output port (P3), first outer side print ground (G1), second outer side print ground (G2), the 3rd outer side print ground (G3), internal ground (GND), direct-to-ground capacitance (C1), output-parallel electric capacity (C2), first inductance (L1), second inductance (L2), isolation resistance (R), typographic(al) mark (M).

2. modified model 2.4GHz LTCC power divider according to claim 1, it is characterized in that: the input of described first inductance (L1) is connected with the input of second inductance (L2) and is connected to input port (P1), and the output of first inductance (L1) and second inductance (L2) is connected to output port (P3) and output port (P2); The input of direct-to-ground capacitance (C1) connects with input port (P1); The two ends, left and right of output-parallel electric capacity (C2) are connected to first inductance (L1) and second inductance (L2); Isolation resistance (R) is positioned at the top of output-parallel electric capacity (C2) and its two ends, left and right connect with cylindrical hole with the two ends, left and right of output-parallel electric capacity (C2) respectively.

3. modified model 2.4GHz LTCC power divider according to claim 1, is characterized in that: described inductance all adopts three-dimensional spiral formula structure, and electric capacity all adopts the structure of metal-dielectric-metal form.

4. modified model 2.4GHz LTCC power divider according to claim 1, is characterized in that: described internal ground (GND) be positioned at whole power splitter ground floor and with first outer side print (G1), second outer side print ground (G2), the 3rd outer side print (G3) connect.

5. modified model 2.4GHz LTCC power divider according to claim 1, is characterized in that: described isolation resistance (R) adopts printed resistor to make, and is inside embedded among LTCC medium.

6. modified model 2.4GHz LTCC power divider according to claim 1, is characterized in that: described typographic(al) mark (M) is positioned at the most top layer of whole power splitter, in order to represent the front of power splitter, represents the input of power splitter simultaneously.

7. modified model 2.4GHz LTCC power divider according to claim 1, is characterized in that: described power splitter is of a size of 3.2mm × 1.6mm × 0.84mm.

8. modified model 2.4GHz LTCC power divider according to claim 1, it is characterized in that: the working frequency range of described power splitter is 2.3GHz ~ 2.5GHz, voltage standing wave ratio≤1.18 of input port (P1), voltage standing wave ratio≤1.14 of output port (P2), voltage standing wave ratio≤1.10 of output port (P3), isolation >=25.80dB, insertion loss≤0.23dB, phase equalization≤0.65 °, amplitude balance≤0.01dB.