CN206698187U

CN206698187U - A kind of filtering F power-like amplifiers based on dielectric resonator

Info

Publication number: CN206698187U
Application number: CN201720433823.2U
Authority: CN
Inventors: 章秀银; 徐金旭; 薛艳梅; 宋校曲
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2017-04-24
Filing date: 2017-04-24
Publication date: 2017-12-01
Anticipated expiration: 2027-04-24

Abstract

The utility model discloses a kind of filtering F power-like amplifiers based on dielectric resonator, including DC bias circuit, input matching circuit, power amplifying transistor, harmonic controling circuit and output matching circuit, the output matching circuit includes being used for the medium matched filter realized complex impedance to the tuning microstrip transmission line of purely real impedance conversion and converted to load impedance for realizing real number impedance, and the tuning microstrip transmission line is connected with medium matched filter.The microstrip line filter matching network and coaxial cavity filter matching network used in contrast to tradition, dielectric resonator filter matching network used in the utility model due to higher Q values, can be obtained in the case where realizing equal-wattage efficiency of amplitude other filter matching networks irrealizable narrower bandwidth.

Description

A kind of filtering F power-like amplifiers based on dielectric resonator

Technical field

It the utility model is related to wireless communication field, and in particular to a kind of filtering F class power based on dielectric resonator is put Big device.

Background technology

Power amplifier and wave filter are all key components in radio frequency transceiver, and their performance is to whole transceiver Performance produce important influence.In traditional design, the input/output port impedance of power amplifier and wave filter all by 50 Ω are designed to, then they are cascaded up by 50 Ω transmission lines.This method can not only introduce extra loss, and The volume of meeting increasing circuit.

In order to reduce volume and loss, wave filter and power amplifier can be merged into a filtered power amplifier electricity Road.In recent years, for how to design filtered power amplifier, academia proposes some solution methods, such as compact is humorous Shake unit, the ultra-wide band filter with trap and low pass filter can be embedded into F power-like amplifiers, for controlling high order humorous Ripple, whole power amplifier is set to show high efficiency, but these circuits do not have bandpass filtering response.In addition, also scholar is by micro-strip band Wave filter that bandpass filter or micro-strip are combined with cavity substitutes the output matching circuit of traditional power amplifier, by using this knot Structure, whole circuit are simplified, and so as to reduce the volume of circuit, while can also keep good filter effect, but with The high speed development of wireless communication system, communication spectrum becomes very crowded, and spectral bandwidth is very narrow, and this requires to filter utensil There is narrow-band filtering response, and the relative bandwidth of above mentioned microstrip filter and micro-strip cavity compound filter all compares Greatly.To solve this problem, input matching circuit of the cavity resonator as power amplifier that has scholar to employ high q-factor is realized narrow Band power amplifier.In addition to cavity body filter, dielectric filter also has the feature of high q-factor, but so far, does not disclose also and carry Go out the Combined design of dielectric filter and power amplifier.

Utility model content

In order to overcome problems of the prior art, the utility model provides a kind of filtering F based on dielectric resonator Power-like amplifier.

Dielectric filter is implanted in F power-like amplifiers by the utility model, and is turned by one section of tuning microstrip line Change complex impedance is real number impedance, which simplify the output matching circuit of power amplifier, simultaneously because dielectric resonance utensil Have higher Q values, it is possible to achieve obtained during higher-wattage added efficiency other filter matching networks it is irrealizable narrower Bandwidth, in addition, by introducing cross-couplings, a transmission zero can be respectively produced in passband both sides, improve wave filter Selectivity.

The utility model adopts the following technical scheme that：

A kind of filtering F power-like amplifiers based on dielectric resonator, including input port, DC bias circuit, input Match circuit, power amplifying transistor, harmonic controling circuit and output matching circuit, the output matching circuit include being used in fact What existing complex impedance converted to the tuning microstrip transmission line of purely real impedance conversion and for realizing real number impedance to load impedance Medium matched filter, the tuning microstrip transmission line are connected with medium matched filter.

The medium matched filter includes input feed structure, output feed structure and at least two dielectric resonators, Described input feed structure, output feed structure and at least two dielectric resonators are connected using main coupling and cross-coupled manner Connect, the input feed structure is connected with tuning microstrip transmission line.

The input feed structure includes the metallic rod of microstrip line and welding on the microstrip line.

The input matching circuit, power amplifying transistor, harmonic controling circuit and tuning microstrip transmission line are sequentially connected, The DC bias circuit has two, is separately positioned on the input and output end of power amplifying transistor.

The length and width of the tuning microstrip transmission line are as the optimum impedance needed for the power amplifier transistor Determined with, the input of described medium matched filter is with the stiffness of coupling of other all filter nodes according to described The purely real impedance for tuning microstrip transmission line conversion determines, for being load impedance by this purely real impedance conversion.

The beneficial effects of the utility model：

(1) circuit structure is simple, relative to traditional by power amplifier and the structure of bandpass filter cascade, this practicality New middle filter circuit is embedded into output matching circuit, simplifies circuit structure；

(2) circuit loss is small, relative to traditional that power amplifier and the structure of bandpass filter cascade, this practicality is new Type eliminates the level on line between wave filter and power amplifier, reduces circuit loss, in addition with existing job family phase Than, it is possible to achieve during Same Efficieney added efficiency with other filter matching networks irrealizable narrower bandwidth.

(3) selectivity is good, relative to existing job family, the band logical described in the utility model based on dielectric resonator Wave filter, cross-couplings be present between each node of wave filter, for producing transmission zero in passband both sides, improve circuit Selectivity.

Brief description of the drawings

Fig. 1 is a kind of structural representation of the filtering F power-like amplifiers based on dielectric resonator of the utility model；

Fig. 2 is S parameter test result figure of the present utility model；

Fig. 3 is the test result figure of the i.e. power added efficiency of power output of the present utility model and PAE；

Fig. 4 is the utility model power output, gain, PAE and drain efficiency test result figure.

Embodiment

With reference to embodiment and accompanying drawing, the utility model is described in further detail, but reality of the present utility model Apply mode not limited to this.

Embodiment

A kind of filtering F power-like amplifiers based on dielectric resonator, including input port 20, DC bias circuit 30, Input matching circuit 21, power amplifying transistor 22, harmonic controling circuit 23, HCC is represented in Fig. 1, and output matching circuit 31, foregoing circuit is configured according to prior art, the input matching circuit 21, power amplifying transistor 22, harmonic wave control Circuit 23 processed and tuning microstrip transmission line 24 are sequentially connected, and the DC bias circuit has two, is separately positioned on power amplification The input and output end of transistor.

The output matching circuit includes one and is used to realize that the tuning micro-strip of complex impedance to purely real impedance conversion passes Defeated line 24 and the medium matched filter 32 converted for realizing real number impedance to load impedance, described medium matched filter With high q-factor, when realizing narrow-band bandpass response, less insertion loss can be obtained.

The length and width of the tuning microstrip transmission line is as the optimum impedance needed for the power amplifier transistor Determined with.

It is humorous that the medium matched filter 32 includes input feed structure 25, the output medium of feed structure 26 and at least two Shake the filter nodes such as device 27, input feed structure, output feed structure and at least two dielectric resonators use main coupling Close and cross-coupled manner connects, for producing transmission zero, enhancing selectivity, the input feedback of described medium matched filter The coupling of electric structure 25 and other all filter nodes is converted purely real according to described tuning microstrip transmission line 24 Impedance determines, for being load impedance by this purely real impedance conversion, cross-couplings be present between node, each on passband both sides A transmission zero is produced, effectively improves the selectivity of passband.

The input feed structure includes the metallic rod 29 of microstrip line 28 and welding on the microstrip line and other filter sections Point coupling, whole medium matching resonator is set to be connected with tuning microstrip transmission line.

According to filter theory, by taking second order as an example, the coupling matrix of described medium matched filter is represented by：

Wherein M_SiThe coupling of (i=1,2, L) between input port and resonator or output port.M_siIt is represented byWherein Q_eiTo input external sort factor, FBW is relative bandwidth.Because quality factor q_eiWith normalizing Change source impedance R_inIt is in direct ratio.The different input resistance of medium matched filter, can be by changing identical input and output impedance The member of coupling matrix usually realize, in order to realize R_inNormalization input impedance, element M_siIt is amended as follows

As can be seen that when input impedance difference, as long as by adjusting M_si, and other coefficients of coup keep constant, Obtain and responded with former wave filter identical.Therefore, the dielectric filter proposed in the utility model can be used as the power amplification A part for the output matching circuit of device, real number impedance transformation is realized, can so reduce circuit volume, obtain relatively low loss Higher efficiency.

The described a kind of filtering F power-like amplifier embodiment block diagrams based on dielectric resonator of Fig. 1 displayings, in embodiment The power amplifying transistor 22 of selection is the GaN HEMT CGH40010F of Cree companies, and the power amplifying transistor includes grid G, drain D and source S, input, output end, grid G DC offset voltage VGS and the drain D DC offset voltage VDS of circuit As marked in Fig. 1, design parameter is：VGS=-2.7V, VDS=28V.

Input matching circuit 21 used in this example, DC bias circuit 30, the grade of harmonic controling circuit 23 according to Conventional method is designed.

PCB medium material is selected in a kind of filtering F power-like amplifiers based on dielectric resonator of this example, processing The parameter of material is as follows：ε_r=2.2, h=0.508, tan δ=0.0012.

A kind of S ginseng of the described filtering F power-like amplifiers based on dielectric resonator of Fig. 2 displayings under small signal driving Number test result, the small-signal gain at centre frequency 1.88GHz are 18.3dB, and 3-dB damages with a width of 2.3% with interior echo Consumption is better than 15dB.In addition, passband both sides produce a transmission zero respectively, frequency is respectively 1.745GHz and 2.023GHz, is had Improve to effect the selectivity of passband.

A kind of described filtering F power-like amplifier examples based on dielectric resonator of Fig. 3 displayings are fixed in input power For 28dBm when, power output and PAE (Power Added Efficiency, power added efficiency) test result, output work Rate is all higher than 40dBm in this frequency range section of 1.865 and 1.89GHz, and it is attached in centre frequency to reach peak power by PAE in addition Add efficiency 70.7%.

A kind of described filtering F power-like amplifier examples centre frequency based on dielectric resonator of Fig. 4 displayings is kept 1.88GHz, input power can be seen by power output when 5 to 30dBm, gain, PAE and drain efficiency test result by figure Go out, the highest drain efficiency of test reaches 75.8%, illustrates a kind of filtering F based on dielectric resonator described in the utility model The circuit efficiency of power-like amplifier is high.

In summary, the utility model provides a kind of filtering F power-like amplifiers based on dielectric resonator, has body Product is small, and selectivity is good, the multiple performance such as small efficiency height of circuit loss, is suitably applied in many radio frequency transceivers.

Above-described embodiment is the preferable embodiment of the utility model, but embodiment of the present utility model is not by described The limitation of embodiment, it is other it is any without departing from Spirit Essence of the present utility model with made under principle change, modify, replace Generation, combination, simplify, should be equivalent substitute mode, be included within the scope of protection of the utility model.

Claims

1. a kind of filtering F power-like amplifiers based on dielectric resonator, including input port, DC bias circuit, input With circuit, power amplifying transistor, harmonic controling circuit and output matching circuit, it is characterised in that the output matching circuit Including for realizing complex impedance to the tuning microstrip transmission line of purely real impedance conversion and for realizing real number impedance to load The medium matched filter of impedance conversion, the tuning microstrip transmission line are connected with medium matched filter.

2. filtering F power-like amplifiers according to claim 1, it is characterised in that the medium matched filter includes Input feed structure, output feed structure and at least two dielectric resonators, described input feed structure, output feed structure And at least two dielectric resonator using it is main coupling and cross-coupled manner connection, it is described input feed structure with tuning micro-strip pass Defeated line connection.

3. filtering F power-like amplifiers according to claim 2, it is characterised in that the input feed structure includes micro- Metallic rod with line and welding on the microstrip line.

4. filtering F power-like amplifiers according to claim 1, it is characterised in that the input matching circuit, power are put Big transistor, harmonic controling circuit and tuning microstrip transmission line are sequentially connected, and the DC bias circuit has two, sets respectively In the input and output end of power amplifying transistor.