CN101777688B - Microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by same - Google Patents
Microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by same Download PDFInfo
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- CN101777688B CN101777688B CN 201010017658 CN201010017658A CN101777688B CN 101777688 B CN101777688 B CN 101777688B CN 201010017658 CN201010017658 CN 201010017658 CN 201010017658 A CN201010017658 A CN 201010017658A CN 101777688 B CN101777688 B CN 101777688B
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Abstract
The invention discloses a microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by the microwave terminal short circuit half-wavelength tunable resonator. The microwave terminal short circuit half-wavelength tunable resonator comprises a terminal short circuit half-wavelength transmission line resonator, two ends of the half-wavelength transmission line resonator are grounded, a variable capacitance diode is connected at the middle part of the half-wavelength transmission line resonator, and the other end of the variable capacitance diode connected at the middle part of the half-wavelength transmission line resonator is grounded. The microwave tunable filter is formed by coupling two identical microwave terminal short circuit half-wavelength trough-line resonators arranged in opposition. The invention has the advantages of compact structure, small size, light weight, easy integration and the like; the microwave terminal short circuit half-wavelength tunable resonator designed in the invention can tune fundamental resonant frequency on the basis of not changing secondary resonant frequency, thus being favorable for inhibiting secondary harmonic and improving system performance.
Description
Technical field:
The microwave tunable filter that the present invention relates to a kind of microwave terminal short circuit half-wavelength tunable resonator and make.
Background technology:
In recent years, the development of mobile phone and radio communication service rapidly, the multiple technologies standard is put into effect in succession, for example UMTS, IEEE802.11a, b, g, n, UWB, WIMAX and GPS etc.Can imagine in a plurality of standards and deposit today of development, want compatible every technology just to need separately independently sending/receiving system, this will increase volume and the cost of equipment greatly.Therefore we just need a kind of diversified system can satisfy the demand of multiple communication band, adapt to the development of future wireless system.
The adjustable system that frequency tunable filter and antenna consist of has satisfied the requirement of multi-band communication, is the focus of Recent study.Resonator is as the element of filter and antenna, and its tuning performance is directly connected to the design objective of frequency adjustable antenna and filter.Tunable resonator adopts the form that loads variable reactive element more, changes the electrical length of resonant element by changing the reactance component value, to reach the purpose of regulating resonance frequency.Variable reactive element adopts mechanical variable capacitance and electrically variable electric capacity usually.The machinery variable capacitance is to control resonance frequency by internal mechanical sliding conductor or Ferrimagnetic element, and this form can not satisfy small size and the fast requirement of frequency response.For overcoming these shortcomings, variable capacitance diode is used widely, and it comes the control capacitance value by reverse voltage, has compact conformation, the advantages such as quick adjustment.
The varactor loading form of existing bibliographical information has two kinds: the first is the transmission-wire terminal loading form, for example this kind of Tunable Microstrip Band Pass Filter with Simple Loss CompensationMethod (such as Fig. 5) form of delivering of Jeongpyo Kim and Jaehoon Choi base time resonance frequency and the secondary resonance frequency that can regulate simultaneously by the value that changes varactor transmission-line efficiency.Most systems wishes to suppress second harmonic in order to reduce crosstalk, but the second harmonic of this kind form is accompanied by first-harmonic all the time, and the secondary resonance frequency is the twice of base time resonance frequency always, is difficult to reduce the crosstalk of system, affects circuit performance; The second is loading form in the middle of the open end transmission line, and for example this kind of Novel Centrally Loaded Resonators and TheirApplications to Bandpass Filters (such as Fig. 6) form of delivering of Xiu Yin Zhang secondary resonance frequency that can change by the value of regulating varactor transmission-line efficiency keeps base time resonance frequency constant; Above two kinds of forms all can't realize in the purpose that keeps only regulating on the constant basis of secondary resonance frequency base time resonance frequency.
Summary of the invention:
The object of the present invention is to provide a kind of compact conformation, be easy to microwave terminal short circuit half-wavelength tunable resonator integrated, only adjusting base time resonance frequency and the microwave tunable filter of making thereof.The present invention can be in the constant basic adjusted fundamental frequency of second harmonic frequency, and second harmonic frequency is the twice of fundamental frequency no longer all the time, can effectively reduce crosstalk to the impact of circuit, improves systematic function.
Technical solution of the present invention is:
A kind of microwave terminal short circuit half-wavelength tunable resonator, it is characterized in that: comprise the half-wavelength transmission-line efficiency, the two-terminal-grounding of half-wavelength transmission-line efficiency, middle part at the half-wavelength transmission-line efficiency is connected to variable capacitance diode, is connected on the other end ground connection of varactor of the middle part of half-wavelength transmission-line efficiency.
Described transmission line is microstrip line, the line of rabbet joint or co-planar waveguide.
The microwave tunable filter that a kind of microwave terminal short circuit half-wavelength tunable resonator is made, it is characterized in that: consisted of by two identical microwave terminal short circuit half-wavelength tunable resonators, its transmission line is the half-wavelength line of rabbet joint, the line of rabbet joint forms by the conductor surface fluting of printed circuit board (PCB) caustic solution on dielectric substrate, middle part at the half-wavelength line of rabbet joint loads varactor, and the equal ground connection of the other end of all varactors, the half-wavelength transmission-line efficiency is bent into the Q-RING structure, and the half-wavelength transmission-line efficiency of two Q-RING structures is coupled relatively.
Q-RING structure one end by one section characteristic impedance be 50 ohm co-planar waveguide as the feeding network of resonator, microwave signal is through these feeding network input and output, this co-planar waveguide adopts interdigital structure to increase which couple degree and impedance matching degree.
The loading position of varactor is half nearside of the Q-RING line of rabbet joint and the total electrical length of interdigital structure, and varactor deflection coplanar waveguide feeder line one side.
Compact conformation of the present invention, have size little, lightweight, be easy to the advantages such as integrated; The terminal short circuit half-wavelength tunable resonator of the present invention's design can better suppress second harmonic compared to traditional tunable resonator, reduces crosstalk to the impact of circuit, improves systematic function.
Description of drawings:
Fig. 1 is the structural representation of microwave terminal short circuit half-wavelength tunable resonator of the present invention.
Fig. 2 is the microwave tunable filter structural representation.
Fig. 3 is that the line of rabbet joint loads the varactor structure schematic diagram.
Fig. 4 is the microwave tunable filter frequency response curve.
Fig. 5 is prior art transmission-wire terminal loading form figure.
Fig. 6 is loading form figure in the middle of the prior art open end transmission line.
Fig. 7 is the Insertion Loss diagram of mixed loading form.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1:
A kind of microwave terminal short circuit half-wavelength tunable resonator (such as Fig. 1) comprises half-wavelength transmission-line efficiency 11, and half-wavelength transmission-line efficiency two-terminal-grounding 12 is realized short circuit.Be connected to varactor 13 in the middle part of half-wavelength transmission-line efficiency, and the equal ground connection 12 of the other end of varactor.Described transmission line is microstrip line, the line of rabbet joint or co-planar waveguide.
Embodiment 2:
The microwave tunable filter that a kind of microwave terminal short circuit half-wavelength tunable resonator is made (such as Fig. 2), this filter is by half-wavelength line of rabbet joint resonator 21, dielectric substrate 22 and varactor C
v23 consist of, and the line of rabbet joint is by the conductor surface fluting of printed circuit board (PCB) corrosion technology on dielectric substrate.Centre 23 at the half-wavelength line of rabbet joint loads varactors, and the equal ground connection of the other end of all varactors can only be regulated by the value that changes varactor the basic subcenter frequency of filter passband.Filter is coupled to form relatively by two identical half-wavelength line of rabbet joint resonators, half-wavelength line of rabbet joint resonator is made square structure to reduce device size, the variation of structure can not affect circuit performance, the co-planar waveguide that one end of square structure is 50 Ω by one section characteristic impedance links to each other with the line of rabbet joint and draws as port, co-planar waveguide links to each other so that microwave signal feed-in and output with radio frequency interface (SMA head), co-planar waveguide adopts interdigital structure 24 to increase the degree of coupling and level of impedance match, interdigital structure has increased the electrical length of the line of rabbet joint simultaneously, so the middle varactor that loads 23 needs deflection co-planar waveguide one side to round half position of a circuit electrical length.The dielectric substrate thickness 0.82mm that this example adopts, dielectric constant is 6.03.Varactor load mode such as Fig. 3, this structure is made of conductor surface 31, the line of rabbet joint 32 and varactor 33, and varactor is carried in the middle of the line of rabbet joint.The half-wavelength slots line width is 0.3mm.The square length of side is 12mm, and two line of rabbet joint resonator spacings are 2.5mm.
Fig. 4 is the response curve of this filter embodiment, and ordinate S21 is loss (dB) among the figure, and abscissa is frequency (GHz).When bias voltage is reduced to 0V by 10V, the middle varactor C that loads
vIncrease to 5.08pF by 0.9pF.The passband base subcenter frequency 41 of microwave tunable filter is adjusted to 1.1GHz downwards by 1.35GHz, and secondary resonance frequency 42 remains unchanged substantially.Reached the effect at the basic adjusted base secondary frequencies that does not affect second harmonic frequency.
Claims (5)
1. microwave terminal short circuit half-wavelength tunable resonator, it is characterized in that: comprise the half-wavelength transmission-line efficiency, the two-terminal-grounding of half-wavelength transmission-line efficiency, middle part at the half-wavelength transmission-line efficiency is connected to variable capacitance diode, is connected on the other end ground connection of varactor of the middle part of half-wavelength transmission-line efficiency.
2. microwave terminal short circuit half-wavelength tunable resonator according to claim 1, it is characterized in that: described transmission line is microstrip line, the line of rabbet joint or co-planar waveguide.
3. microwave tunable filter that microwave terminal short circuit half-wavelength tunable resonator claimed in claim 1 is made, it is characterized in that: consisted of by two identical microwave terminal short circuit half-wavelength tunable resonators, its transmission line is the half-wavelength line of rabbet joint, the line of rabbet joint forms by the conductor surface fluting of printed circuit board (PCB) caustic solution on dielectric substrate, middle part at the half-wavelength line of rabbet joint loads varactor, and the equal ground connection of the other end of all varactors, the half-wavelength transmission-line efficiency is bent into the Q-RING structure, and the half-wavelength transmission-line efficiency of two Q-RING structures is coupled relatively.
4. microwave tunable filter according to claim 3, it is characterized in that: Q-RING structure one end is that 50 ohm co-planar waveguide is as the feeding network of resonator by one section characteristic impedance, microwave signal is through these feeding network input and output, and this co-planar waveguide adopts interdigital structure to increase which couple degree and impedance matching degree.
5. microwave tunable filter according to claim 4, it is characterized in that: the loading position of varactor is half nearside of the Q-RING line of rabbet joint and the total electrical length of interdigital structure, and varactor deflection coplanar waveguide feeder line one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010017658 CN101777688B (en) | 2010-01-11 | 2010-01-11 | Microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010017658 CN101777688B (en) | 2010-01-11 | 2010-01-11 | Microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by same |
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| Publication Number | Publication Date |
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| CN101777688A CN101777688A (en) | 2010-07-14 |
| CN101777688B true CN101777688B (en) | 2013-04-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856614B (en) * | 2012-08-30 | 2015-01-14 | 南通大学 | Compact microwave distributed band-pass filter with double pass-bands |
| US9325046B2 (en) * | 2012-10-25 | 2016-04-26 | Mesaplexx Pty Ltd | Multi-mode filter |
| CN108279332B (en) * | 2017-12-18 | 2023-06-06 | 河南师范大学 | Fluid dielectric constant microwave measuring device based on microfluidic channel |
| CN108493533B (en) * | 2018-05-21 | 2020-06-09 | 南通大学 | Tunable filter with stable wide stop band |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819194B2 (en) * | 2001-04-11 | 2004-11-16 | Kyocera Wireless Corp. | Tunable voltage-controlled temperature-compensated crystal oscillator |
| CN1762095A (en) * | 2003-03-19 | 2006-04-19 | 皇家飞利浦电子股份有限公司 | Microstrip filter of short length |
| CN101038977A (en) * | 2006-03-16 | 2007-09-19 | 中国科学院上海微系统与信息技术研究所 | Open loop coupling band-pass filter based on microstrip capacitive load |
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2010
- 2010-01-11 CN CN 201010017658 patent/CN101777688B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819194B2 (en) * | 2001-04-11 | 2004-11-16 | Kyocera Wireless Corp. | Tunable voltage-controlled temperature-compensated crystal oscillator |
| CN1762095A (en) * | 2003-03-19 | 2006-04-19 | 皇家飞利浦电子股份有限公司 | Microstrip filter of short length |
| CN101038977A (en) * | 2006-03-16 | 2007-09-19 | 中国科学院上海微系统与信息技术研究所 | Open loop coupling band-pass filter based on microstrip capacitive load |
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