CN1330097C

CN1330097C - Delaying matcher

Info

Publication number: CN1330097C
Application number: CNB021551251A
Authority: CN
Inventors: 田其
Original assignee: ZTE Corp
Current assignee: Jinjiang high and new technology development office
Priority date: 2002-12-10
Filing date: 2002-12-10
Publication date: 2007-08-01
Anticipated expiration: 2022-12-10
Also published as: CN1507162A

Abstract

The present invention discloses a delaying matcher comprises a circulator (101), a cavity body delaying filter (102), a short circuiter (103) and radio-frequency connectors (1, 2, 3, 4, 5 and 6), wherein radio-frequency signals or microwave signals are input from a port (1) of the circulator (101) and are output from a port (2) to a port (4) of the cavity body delaying filter (102) through the action of the circulator for entering the cavity body delaying filter, and then the signals are output from a port (5) to a port (6) for entering the short circuiter (103). The radio-frequency signals are returned to the port (2) and are input to the circulator (101) along the port (6), the port (5), the cavity body delaying filter (102) and the port (4) through the total reflection of the short circuiter (103); the radio-frequency signals are output from a ports (3) through the action of the circulator, which saves cost required for the delaying filter. The present invention can be used for linear power amplifying in the field of wireless communication.

Description

A kind of time-delay coalignment

Technical field

The invention belongs to field of wireless communication, relate in particular to the Linear Power Amplifier technical field.

Background technology

In communication, in the communication process of signal from the information source to the stay of two nights,, can cause the delay variation in the signal communication process, thereby cause the deterioration of communication quality for multipath propagation.In order to guarantee communication quality, the coupling of need delaying time is controlled in the claimed range delay difference in each path.

At Linear Power Amplifier, Feed Forward Power Amplifier especially is in order to guarantee the good effect that offsets, the coupling of need delaying time.For feedforward linear power amplifier, the coupling of need delaying time mainly contains two places, and the one, main ring is offset needs the time-delay coupling, and the 2nd, error loop is offset needs the time-delay coupling.

The means that realize radio frequency time-delay coupling at present have:

Transmission line time-delay coupling.Electric wave is exactly the time-delay of this transmission line in the time that transmission line is propagated.The advantage of this mode is that transmission characteristic is good, does not deposit the problem of bandwidth, good economy performance; Its shortcoming is, loss is big, and volume is big.It is less that it generally is used for power ratio, the place that amount of delay is smaller, the time-delay coupling that offsets such as the main ring of Feed Forward Power Amplifier.

The filter mode realizes the time-delay coupling, and its advantage is under the situation with power time-delay together, can realize the time-delay coupling with smaller volume, but there is the problem of bandwidth constraints in it.The filtering wave by prolonging time device of radio frequency band mainly contains three types at present: a kind of is the frequency medium filter, and it is smaller to bear power (hundred milliwatt levels), transmission characteristic (time-delay flatness, attenuation characteristic, phase linearity) want some doing, and cost is low.(especially time time-delay characteristics) is difficult for carrying out because its transmission characteristic, and in Linear Power Amplifier, to the time-delay characteristics of coupling device, requires relatively strictlyer, generally seldom uses the frequency medium filter; Second kind is LC or microstrip filter, and advantage is that volume is little, and cost is low, and it is smaller that shortcoming is born power (W level), and loss is big.It is less that it generally is used for power ratio, the place that amount of delay is smaller, the time-delay coupling that offsets such as the main ring of Feed Forward Power Amplifier; The third is a cavity filtering wave by prolonging time device, bears power ratio big (more than the hundred W levels), and loss is little, and cost is higher.It is applied to the time-delay coupling under the bigger situation of power ratio.

For cavity filtering wave by prolonging time device, the size of its amount of delay is relevant with cavity filtering joint number, and joint number is many more, and amount of delay is big more, and cost is just high more.At present, be the filtering wave by prolonging time device of 100W for power margin, the about 200 yuan of costs of every nS.Its cost of filtering wave by prolonging time device of a 10nS is about 2000 yuan in Linear Power Amplifier.

Summary of the invention

Technical problem to be solved by this invention is: make cavity filtering wave by prolonging time device multiplication time-delay, reduce the cost of filtering wave by prolonging time device time-delay coupling.

The present invention has constructed a kind of time-delay coalignment, is made of first port one, second port 2, the 3rd port 3, the 4th port 4, five-port 5, the 6th port 6 of circulator 101, cavity filtering wave by prolonging time device 102, short-circuiting device 103 and radio frequency connector each other.

RF or microwave signal Pin are from first port one input of circulator 101, export the 4th port 4 of cavity filtering wave by prolonging time device (102) to by second port 2 by the effect of circulator 101, enter cavity filtering wave by prolonging time device 102, export the 6th port 6 to, enter short-circuiting device 103 from five-port 5.After these radiofrequency signal process short-circuiting device 103 total reflections, along the 6th port 6, the five-port 5, cavity filtering wave by prolonging time device 102, the four ports 4 are back to 2 inputs of second port and advance circulator (101), by the effect of circulator 101, by the 3rd port 3 mouthfuls of outputs, i.e. Po.Wherein, described circulator (101) is the one-way transmission device, has symmetry

Adopt device of the present invention,, realize same long delay time, realize comparing, can save 40% cost with simple employing cavity filtering wave by prolonging time device owing to twice process of signal circulator 101, cavity filtering wave by prolonging time device 102.

Description of drawings:

Fig. 1.Time-delay multiplying assembly theory diagram.

Embodiment

Be described in detail implementing the present invention below in conjunction with accompanying drawing.

As shown in Figure 1, circulator 101, it is a kind of one-way transmission device.When signal from 1 mouthful of when input, from 2 mouthfuls of outputs, 3 mouthfuls is isolation end; When signal from 2 mouthfuls of whens input, from 3 mouthfuls of outputs, 1 mouthful is isolation end; When signal from 3 mouthfuls of whens input, from 1 mouthful of output, 2 mouthfuls is isolation end.

Cavity filtering wave by prolonging time device 102.Can in certain working frequency range, produce certain time-delay by it.

Short-circuiting device 103 can be realized the radiofrequency signal short circuit, and the signal of sending here from cavity filtering wave by prolonging time device can be gone back in total reflection.

1, the 2,3,4,5, the 6th, the port of radio frequency connector.

Suppose that the time-delay of port radio frequency connector and loss are ignored and do not remember that radiofrequency signal inputs to port 3 outputs from port one so, the link that produces time-delay has:

(1) mouthful 1 joint time-delay of arriving the circulator of port 2 is made as t1

(2) incident port 4 is made as T1 to the cavity filtering wave by prolonging time device time-delay of port 5;

(3) reflector port 5 to port 4 the time-delay of cavity filtering wave by prolonging time device, be made as T2;

(4) port 2 is made as t2 to the joint time-delay of the circulator of port 3;

Because the reciprocity of cavity filtering wave by prolonging time device is so T1=T2 is made as T; Because the symmetry of the joint of circulator is so t1=t2 is made as t.The time-delay of entire path is so:

τ＝2*(T+t)

The basic principle of above apparatus of the present invention in specific implementation process, requires the circulator bandwidth of operation more wide than the work zone of filtering wave by prolonging time device.And enough isolations (greater than 20dB) must be arranged.For guaranteeing the reciprocity of filtering wave by prolonging time device, can not add unidirectional device in the cavity body filter in addition, such as isolator, circulator etc.

This device is to increase a circulator (101) and a short-circuiting device (103) to reach the purpose of multiplication time-delay on the basis of filtering wave by prolonging time device (102).

Derivative schemes:, also can reach the purpose of multiplication time-delay if the cavity body filter in this programme (102) is changed to general time delay device (all reciprocal devices that can produce time-delay T).Total time-delay is:

τ＝2*(T+t)

Below with certain 2100M, the time-delay mechanism of 30W Linear Power Amplifier (this power amplifier error loop offsets the time-delay coupling that needs 15nS) is for example is carried out to this analysis, with show this device and constant power with etc. the cost advantage of time-delay situation lower chamber filter.

Adopt device of the present invention to realize the 15nS time-delay, because the about 1.2nS of the single-unit of 2100M circulator time-delay, the amount of delay of the filtering wave by prolonging time device in this device is 6.3nS so, realizes that with simple employing cavity filtering wave by prolonging time device the time-delay of 15nS can save 40% cost.

The simple time-delay of adopting cavity filtering wave by prolonging time device to realize 15nS, about 3000 yuan of its cost.

And adopt device of the present invention to realize the 15nS time-delay, its cost structure is as follows:

6.3nS cavity filtering wave by prolonging time device, about 1300 yuan of its cost.

2100M, the cost of 100W circulator are about 300 yuan.

The cost of short-circuiting device is about 50 yuan.

Additional dress is unified into these 50 yuan.

Total cost is about 1700 yuan, than low 1300 yuan of the cost of simple employing cavity filtering wave by prolonging time device, reduces the cost 42%.

In sum, adopt device of the present invention, compare, can save cost more than 40% with simple cavity filtering wave by prolonging time device.

Claims

1 one kinds of time-delay coalignments, comprise: cavity filtering wave by prolonging time device (102), it is characterized in that, also comprise circulator (101), short-circuiting device (103), and described circulator (101), cavity filtering wave by prolonging time device (102), first port (1) of short-circuiting device (103) radio frequency connector each other, second port (2), the 3rd port (3), the 4th port (4), five-port (5), the 6th port (6);

Radiofrequency signal or microwave signal are imported from circulator (101) first ports (1), export the 4th port (4) of cavity filtering wave by prolonging time device (102) to by second port (2) by the effect of circulator (101), enter cavity filtering wave by prolonging time device (102), export the 6th port (6) to from five-port (5), enter short-circuiting device (103), after this radiofrequency signal process short-circuiting device (103) total reflection, along the 6th port (6), five-port (5), cavity filtering wave by prolonging time device (102), the 4th port (4) is back to second port (2) input and advances circulator (101), by the effect of circulator (101), is exported by the 3rd port (3);

Wherein, described circulator (101) is the one-way transmission device, has symmetry.

2 time-delay coalignments as claimed in claim 1 is characterized in that: cavity filtering wave by prolonging time device (102) has reciprocity.

3 time-delay coalignments as claimed in claim 1 is characterized in that: short-circuiting device (103), realize the radiofrequency signal short circuit, and the signal total reflection of sending here from cavity filtering wave by prolonging time device is gone back.

4 as claim 1 or 2 or 3 described time-delay coalignments, and it is characterized in that: circulator (101) bandwidth of operation is more wide than the work zone of cavity filtering wave by prolonging time device (102), and the isolation greater than 20dB must be arranged.