CN100401579C - Microwave Power Splitter Based on Left and Right Hand Composite Transmission Line - Google Patents

Abstract

The present invention discloses a microwave power splitter based on a left-hand and right-hand composite transmission line. The microwave power splitter is provided with a plurality of left-hand and right-hand composite transmission line units connected in parallel, and every left-right-hand composite transmission line unit is formed by the way that a right hand material electrical inductance L[R] and a left hand material capacitor C[L]are connected in series, then are connected in parallel with the left hand material electrical inductance L[L] and the right hand material capacitor C[R] and are connected in series with a resistor R again. The microwave power splitter based on a left-hand and right-hand composite transmission line has the following advantages that large and narrow working frequency band can be obtained, insertion loss is low, and power is equalized; simultaneously because the capacitor, the electrical inductance and a resistor element are used, the microwave power splitter based on a left-hand and right-hand composite transmission line has the advantages of simple structure, low cost, very small size and convenient make and integration. The practical design is carried out for the power splitter of a left-hand and right-hand composite transmission line for equalizing power, the result is displayed within the range of a wide frequency band, and performance is good.

Description

Microwave Power Splitter Based on Left and Right Hand Composite Transmission Line

technical field

The invention relates to a microwave power divider based on left and right hand composite transmission lines.

Background technique

Microwave power divider is a multi-port microwave network that divides the input signal power into equal or unequal power outputs, and is widely used in radio frequency or microwave communication, satellite communication, wireless communication, cable TV, microwave phase array antenna .

At present, the known practical microwave power splitters are usually divided into Wilkinson structure, T-shaped structure, disk-shaped or fan-shaped, wedge-shaped structure of Gupta et al., or power splitters composed of directional coupled microstrip lines. However, these existing microwave power splitters have the disadvantages of narrow operating frequency band, low frequency, complex structure, large size, and high manufacturing process requirements.

Working frequency band, size, mass size, structural complexity, low insertion loss, and power equalization are factors that must be considered in designing a good microwave power splitter. In order to expand the working frequency band of the power splitter, reduce the size, and simplify the manufacturing process, many scholars have proposed some methods, such as: adopting a miniaturized Wilkinson structure power splitter structure, but the difficulty of making the whole power splitter has not been improved. .

Contents of the invention

The purpose of the present invention is to integrate microwave and millimeter wave circuits more compactly and efficiently, overcome the shortcomings of existing microwave power splitters such as narrow operating frequency band, low frequency, complex structure, large size, and high manufacturing process requirements, and provide a A microwave power splitter based on a left-handed composite transmission line with large narrow working frequency band, low insertion loss, power equalization, low cost, small size, and easy fabrication and integration.

A plurality of left-hand composite transmission line units are connected in parallel, and the left-hand composite transmission line unit is: after the right-hand material inductor and the left-hand material capacitor are connected in series, they are connected in parallel with the left-hand material inductor and right-hand material capacitor connected in series; at the same time, one end of the resistor is connected to the left-hand material inductor And the middle of the right-hand material capacitor, and the other end is grounded.

The present invention can obtain large and narrow working frequency band, low insertion loss, and power equalization. At the same time, due to the use of capacitance, inductance, and resistance elements, the microwave power splitter of the left-hand composite transmission line has a simple structure, low cost, small size, and is easy to manufacture. and integration. The practical design of left and right handed composite transmission line power splitter with equal power division shows that it has good performance in a wide frequency range.

Description of drawings

Figure 1 is a schematic diagram of the structure of a left-handed composite transmission line power divider;

Fig. 2 is a structural schematic diagram of the left and right hand composite transmission line unit of the present invention;

Fig. 3 is a schematic diagram of the power splitter performance (S ₂₁ : S ₃₁ = 1: 1) composed of two left-hand and left-hand composite transmission line units;

Fig. 4 is a schematic diagram of the power splitter performance (S ₂₁ : S ₃₁ = 1: 1) composed of 3 left and right hand composite transmission line units;

Fig. 5 is a schematic diagram of the performance of a power divider (S ₂₁ :S ₃₁ =1.2:1) composed of two right-handed composite transmission line units.

Detailed ways

A plurality of left-hand composite transmission line units are connected in parallel, and the left-hand composite transmission line unit is: after the right-hand material inductor _LR and the left-hand material capacitor G _L are connected in series, they are connected in parallel with the left-hand material inductor L _L and right-hand material capacitor C _R connected in series; at the same time One end of the resistor R is connected between the left-hand material inductance _LL and the right-hand material capacitor _CR , and the other end is grounded. The signal is input by port 1 and output by port 2 and port 3. By choosing to increase or decrease (2-3) the number of right-handed composite transmission line units connected in parallel to obtain the required performance index of the microwave power splitter.

Example of microwave power divider based on left-hand composite transmission line: According to the required power division ratio S ₂₁ : S ₃₁ = 1:1, the capacitance C _R , _CL , inductance L _R , _LL corresponding to the left-hand composite transmission line unit can be obtained, Value of resistance R, that is, left-hand material capacitance C' _L ＝ _CL ＝1pF, right-hand material inductance L' _R ＝L _R ＝0.25nH, left-hand material inductance L' _L ＝ _LL ＝0.5nH, right-hand material capacitance C' _R ＝ C _R =0.5pF, resistance R'=R=200Ω. Finally, the parallel design of microwave power splitters with 2 and 3 right-handed composite transmission line units is carried out, and the performance of microwave power splitters based on left-handed composite transmission lines is obtained as shown in Figure 3 and Figure 4.

According to the required power division ratio S ₂₁ : S ₃₁ =1.2:1, the left-hand material capacitance C' _L =2pF, C _L =1pF, the right-hand material inductance L' _R =1nH, L _R =0.25nH; the left-hand material inductance L' _L =0.5nH, L _L =0.5nH; the capacitance of the right-hand material C' _R =1pF, C _R =0.5pF; the resistance R'=25Ω, R=200Ω. A microwave power splitter designed in parallel with two right-handed composite transmission line units is used to obtain the performance of the microwave power splitter based on the left-handed composite transmission line as shown in Figure 5.

Claims (7)

1. the microwave power distributor based on left-right-hand composite transmission line is characterized in that it being that the left-right-hand composite transmission line unit is by the unit parallel connection of a plurality of left-right-hand composite transmission lines: right-handed material inductance (L _R), left-handed materials electric capacity (C _L) after the serial connection, with the mutual left-handed materials inductance (L that is connected in series _L) and right-handed material electric capacity (C _R) and connect; An end of resistance (R) is connected left-handed materials inductance (L simultaneously _L) and right-handed material electric capacity (C _R) in the middle of, and other end ground connection.

2. a kind of microwave power distributor based on left-right-hand composite transmission line according to claim 1 is characterized in that, described a plurality of left-right-hand composite transmission lines unit is 2～3.

3. a kind of microwave power distributor based on left-right-hand composite transmission line according to claim 1 is characterized in that, described left-handed materials electric capacity (C _L) electric capacity be 1pF～2pF.

4. a kind of microwave power distributor based on left-right-hand composite transmission line according to claim 1 is characterized in that, described right-handed material inductance (l _R) inductance be 0.25nH～1nH.

5. a kind of microwave power distributor based on left-right-hand composite transmission line according to claim 1 is characterized in that, described left-handed materials inductance (L _L) inductance be 0.5nH.

6. a kind of microwave power distributor based on left-right-hand composite transmission line according to claim 1 is characterized in that, described right-handed material electric capacity (C _R) electric capacity be 0.5pF～1pF.

7. a kind of microwave power distributor based on left-right-hand composite transmission line according to claim 1 is characterized in that the resistance of described resistance (R) is 25～200 Ω.

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