CN109639253B - Inductor-reusable miniaturized harmonic filter - Google Patents
Inductor-reusable miniaturized harmonic filter Download PDFInfo
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- CN109639253B CN109639253B CN201811521877.XA CN201811521877A CN109639253B CN 109639253 B CN109639253 B CN 109639253B CN 201811521877 A CN201811521877 A CN 201811521877A CN 109639253 B CN109639253 B CN 109639253B
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Abstract
The invention discloses a miniaturized harmonic filter with reusable inductors, which comprises a relay and a filtering unit; the number of the relays is K, the number of the filtering units is M, and one relay is connected with the N filtering units to form a harmonic filter with one wave band; the filtering unit comprises an inductor and a capacitor; harmonic filters of K wave bands are connected to form wave band harmonic filter suppression of the broadband power amplifier; the invention adopts the filter superposition multiplexing, applies the filter of the high frequency band to the filter of the low frequency band, and realizes the superposition multiplexing; meanwhile, each filtering unit is provided with a capacitor, and the capacitors are switched to realize low cost and small volume; the low-pass filter with high cut-off frequency is used as a part of the low-pass filter with low cut-off frequency, so that the number of filtering units is reduced, the size is reduced, and the miniaturization design is realized; and along with the reduction of the using amount of the filtering units and the relays, the whole weight is correspondingly reduced, and the cost is further greatly reduced.
Description
Technical Field
The invention relates to the research field of communication technology, in particular to a miniaturized harmonic filter with reusable inductors.
Background
When a communication system is designed, harmonic components generated by a radio frequency power amplifier are large, and the harmonic components can generate serious interference on other communication equipment or electronic equipment after being radiated, so that a harmonic suppression device is generally required to be designed when the communication system is designed;
the existing harmonic suppression device has the following traditional filter scheme: scheme 1: a conventional harmonic filter; scheme 2: quarter-wave suppression;
wherein scheme 1: in the traditional harmonic filter scheme, for the design of a broadband power amplifier, the low-frequency harmonic component of the broadband power amplifier falls into the band, so that the whole frequency band is divided into multiple sections to be filtered respectively, in order to meet the requirement of harmonic suppression, the harmonic of each section of frequency is suppressed by adopting an independent low-pass filter, so that the harmonic filter of the radio frequency power amplifier is formed and consists of multiple independent low-pass filters, and meanwhile, corresponding filters are selected to work in a matched mode according to the work of different frequencies by using the gating of a relay; however, the harmonic filter is connected to the power amplifier and then generally requires a large power capacity, so that the size is large and the cost is high; in the design of the broadband radio frequency power amplifier, the simple structure cannot meet the design requirement. For example, a power amplifier of 1.6 MHz-30 MHz is designed, and the second harmonic of the low frequency falls in the passband. At this time, it is impossible to perform harmonic suppression by only depending on one harmonic filter, and it is necessary to switch a plurality of harmonic filters by switches, for example, a radio frequency power amplifier of 1.6MHz to 30MHz is divided into 7 bands to perform harmonic filter suppression, and then 7 independent harmonic filters are necessary, and the high-power switch relay is used to perform gating matching work of the harmonic filter according to the working frequency of the radio frequency power amplifier, so the design scheme has large occupied area, high weight and high material cost.
Wherein scheme 2: a quarter-wave transmission line is used as a wave trap to suppress harmonic components. The scheme of inhibiting the second harmonic by the quarter wavelength is only suitable for the power amplifier with very narrow bandwidth, otherwise, the impedance to ground does not present high impedance under the condition of deviating the quarter bandwidth to be wider, so that the effective matching of the power amplifier cannot be realized, and the harmonic filtering inhibition requirement of the radio frequency power amplifier designed by the broadband cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a miniaturized harmonic filter with reusable inductors, which applies the special property of a low-pass filter, reuses the low-pass filter with high cut-off frequency in the low-pass filter with low cut-off frequency, carries out gating by switching the states of K relays and respectively controls the working states of different wave bands by different relays.
The purpose of the invention is realized by the following technical scheme:
a miniaturized harmonic filter with reusable inductance is characterized by comprising a relay and a filtering unit;
the number of the relays is K, the number of the filtering units is M, and one relay is connected with one filtering unit to form a harmonic filter with one wave band;
the filtering unit comprises an inductor and a capacitor;
harmonic filters of K wave bands are connected to form wave band harmonic filter suppression of the broadband power amplifier.
Furthermore, the harmonic wave filters of the wave band are connected in a cascade mode;
furthermore, one of the filter units is formed by connecting an inductor and three capacitors, and each capacitor comprises a main capacitor and two auxiliary capacitors;
further, the inductance is connected to the capacitance, specifically: the inductor is connected with the main capacitor in parallel, the first end of the auxiliary first capacitor is connected with the first end of the main capacitor in series, and the second end of the auxiliary first capacitor is grounded; the first end of the auxiliary second capacitor is connected with the second end of the main capacitor in series, and the second end of the auxiliary second capacitor is grounded; the auxiliary first capacitor and the auxiliary second capacitor are used for capacitance compensation;
furthermore, the relay and the filter unit are connected in series; the method specifically comprises the following steps:
one end of the relay of the wave band is connected with the filtering unit of the wave band, and the other end of the relay of the wave band is connected with the filtering unit of the previous wave band; the other end of the filter unit of the wave band is connected with a relay of the next wave band;
further, said M > K;
furthermore, the filtering units which are not connected with the relay are connected in series with the harmonic filter of the last wave band;
furthermore, the wave bands of the harmonic filter of the wave bands are sequentially from low frequency to high frequency;
furthermore, the relay is a double-pole single-throw relay, one switch is connected with a filter unit of the upper wave band, and the other switch is connected with a compensation capacitor of the wave band; the compensation capacitor of the present waveband is used for capacitance compensation.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention adopts the filter superposition multiplexing, applies the filter of the high frequency band to the filter of the low frequency band, and realizes the superposition multiplexing; meanwhile, each filtering unit is provided with a capacitor, and the capacitors are switched to realize low cost and small volume;
2. the invention takes the low-pass filter with high cut-off frequency as a part of the low-pass filter with low cut-off frequency, thus reducing the number of filtering units, reducing the volume and realizing the miniaturization design; and along with the reduction of the using amount of the filtering units and the relays, the whole weight is correspondingly reduced, and the cost is further greatly reduced.
Drawings
Fig. 1 is a structural diagram of a miniaturized harmonic filter with reusable inductors according to the present invention;
FIG. 2 is a diagram of a first filtering unit according to an embodiment of the present invention;
FIG. 3 is a signal flow diagram of an embodiment of the present invention operating in BAND7;
FIG. 4 is a signal flow diagram of an embodiment of the present invention operating in BAND6;
fig. 5 is a signal flow diagram of the embodiment of the present invention operating in BAND 1.
IN the figure, a first relay K1, a second relay K2, a third relay K3, a fourth relay K4, a fifth relay K5, a sixth relay K6, a seventh relay K7, a first compensation capacitor C1013, a seventh band first compensation capacitor C1014, a seventh band second compensation capacitor C1011, a sixth band first compensation capacitor C1012, a sixth band second compensation capacitor C109, a fifth band first compensation capacitor C1010, a fourth band first compensation capacitor C107, a fourth band second compensation capacitor C108, a third band first compensation capacitor C105, a third band second compensation capacitor C106, a second band first compensation capacitor C103, a second band second compensation capacitor C104, a first compensation capacitor C101, a first compensation capacitor C102, a second compensation capacitor C1, a first filter unit C2, a second filter unit C3, a third filter unit C4, a fourth filter unit K5, a fifth filter unit C6, a sixth filter unit C7, a harmonic filter unit C1_ OUT, a harmonic filter unit C1, a harmonic filter unit C8, a first harmonic filter unit C1_ OUT, a second harmonic filter unit C9, a first harmonic filter unit C1_ OUT, a second harmonic filter unit C9, a third harmonic filter unit and a third harmonic filter unit.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
The embodiment is as follows:
a miniaturized harmonic filter with reusable inductance is shown in FIG. 1 and comprises a radio frequency amplifier, a relay and a filtering unit;
the relays are double-pole single-throw relays, the number of the relays is K, K is 7, and the relays are respectively a first relay K1, a second relay K2, a third relay K3, a fourth relay K4, a fifth relay K5, a sixth relay K6 and a seventh relay K7; the number of the filtering units is M, where M is 9, and the filtering units are respectively a first filtering unit 1, a second filtering unit 2, a third filtering unit 3, a fourth filtering unit 4, a fifth filtering unit 5, a sixth filtering unit 6, a seventh filtering unit 7, an eighth filtering unit 8 and a ninth filtering unit 9;
wherein, the switching of the relay controls the access of the filtering unit, thereby forming a harmonic filter with a wave band; the seventh relay K7 is switched, that is, the first switch of the seventh relay K7 is connected to the input terminal RF _ IN of the harmonic filter with seven BANDs, and the second switch of the seventh relay K7 is connected to the seventh BAND first compensation capacitor C1013 to the ground, so that the seventh relay K7 is cascaded with the seventh filtering unit 7, the eighth filtering unit 8 and the ninth filtering unit 9 to form the seventh BAND harmonic filter BAND7; similarly, the sixth relay K6 is switched, that is, the first switch of the sixth relay K6 is connected to the input terminal RF _ IN of the harmonic filter with seven BANDs, and the second switch of the sixth relay K6 is connected to the sixth BAND first compensation capacitor C1011 to ground, so that the sixth relay K6 is cascaded with the sixth filtering unit 6, the seventh filtering unit 7, the eighth filtering unit 8 and the ninth filtering unit 9 to form the sixth BAND harmonic filter BAND6; the fifth relay K5 is switched, namely a first switch of the fifth relay K5 is connected with an input end RF _ IN of a harmonic filter with seven wave BANDs, a second switch of the fifth relay K5 is connected to a fifth wave BAND first compensation capacitor C109 to be grounded, and the fifth relay K5 is connected with a fifth filtering unit 5, a sixth filtering unit 6, a seventh filtering unit 7, an eighth filtering unit 8 and a ninth filtering unit 9 IN a cascade mode to form a harmonic filter BAND5 with a fifth wave BAND; the fourth relay K4 is switched, namely a first switch of the fourth relay K4 is connected with an input end RF _ IN of a harmonic filter with seven wave BANDs, a second switch of the fourth relay K4 is connected to a first compensation capacitor C107 of the fourth wave BAND to be grounded, and the fourth relay K4 is connected with a fourth filtering unit 4, a fifth filtering unit 5, a sixth filtering unit 6, a seventh filtering unit 7, an eighth filtering unit 8 and a ninth filtering unit 9 IN a cascade mode to form a harmonic filter BAND4 of the fourth wave BAND; the third relay K3 is switched, namely a first switch of the third relay K3 is connected with an input end RF _ IN of a harmonic filter with seven wave BANDs, a second switch of the third relay K6 is connected to a first compensation capacitor C105 of the third wave BAND to be grounded, and the third relay K3 is connected with a third filtering unit 3, a fourth filtering unit 4, a fifth filtering unit 5, a sixth filtering unit 6, a seventh filtering unit 7, an eighth filtering unit 8 and a ninth filtering unit 9 IN a cascade mode to form a harmonic filter BAND3 of the third wave BAND; the second relay K2 is switched, namely a first switch of the second relay K2 is connected with an input end RF _ IN of a harmonic filter with seven wave BANDs, a second switch of the second relay K2 is connected to a first compensation capacitor C103 of the second wave BAND to be grounded, and the second relay K2 is connected with the second filtering unit 2, the third filtering unit 3, the fourth filtering unit 4, the fifth filtering unit 5, the sixth filtering unit 6, the seventh filtering unit 7, the eighth filtering unit 8 and the ninth filtering unit 9 IN a cascade mode to form the harmonic filter BAND2 of the second wave BAND; the first relay K1 is switched, namely a first switch of the first relay K1 is connected with an input end RF _ IN of a harmonic filter with seven wave BANDs, a second switch of the first relay K1 is connected to a first compensation capacitor C101 of the first wave BAND to be grounded, and the first relay K1 is connected with a first filtering unit 1, a second filtering unit 2, a third filtering unit 3, a fourth filtering unit 4, a fifth filtering unit 5, a sixth filtering unit 6, a seventh filtering unit 7, an eighth filtering unit 8 and a ninth filtering unit 9 IN a cascade mode to form the harmonic filter BAND1 of the first wave BAND;
the filtering unit comprises an inductor and a capacitor; as shown in fig. 2, the first filter unit 1 includes a first inductor H1, a first capacitor C1_1 attached to the first filter unit, and a second capacitor C1_2 attached to the first filter unit, and the connection manner is: the first inductor H1 is connected with the first capacitor C1 in parallel, one end of the first capacitor is connected with the first filter unit auxiliary first capacitor C1_1 to be grounded, and the other end of the first capacitor is connected with the first filter unit auxiliary second capacitor C1_2 to be grounded; similarly, the second filter unit 2 includes a second inductor H2, a second capacitor C2, a first capacitor C2_1 attached to the second filter unit, and a second capacitor C2_2 attached to the second filter unit, and the connection method is as follows: the second inductor H2 is connected with the second capacitor C2 in parallel, one end of the second capacitor is connected with the second filter unit auxiliary first capacitor C2_1 to be grounded, and the other end of the second capacitor is connected with the second filter unit auxiliary second capacitor C2_2 to be grounded; the third filter unit 3 includes a third inductor H3, a third capacitor C3, a first capacitor C3_1 attached to the third filter unit, and a second capacitor C3_2 attached to the third filter unit, and the connection method is as follows: the third inductor H3 is connected with a third capacitor C3 in parallel, one end of the third capacitor is connected with the first capacitor C3_1 attached to the third filter unit to be grounded, and the other end of the third capacitor is connected with the second capacitor C3_2 attached to the third filter unit to be grounded; the fourth filtering unit 4 includes a fourth inductor H4, a fourth capacitor C4, a first capacitor C4_1 attached to the fourth filtering unit, and a second capacitor C4_2 attached to the fourth filtering unit, and the connection method is as follows: a fourth inductor H4 is connected with a fourth capacitor C4 in parallel, one end of the fourth capacitor is connected with the fourth filter unit auxiliary first capacitor C4_1 to be grounded, and the other end of the fourth capacitor is connected with the fourth filter unit auxiliary second capacitor C4_2 to be grounded; the fifth filtering unit 5 includes a fifth inductor H5, a fifth capacitor C5, a first capacitor C5_1 attached to the fifth filtering unit, and a second capacitor C5_2 attached to the fifth filtering unit, and the connection method is as follows: a fifth inductor H5 is connected with a fifth capacitor C5 in parallel, one end of the fifth capacitor is connected with the first capacitor C5_1 attached to the fifth filter unit and grounded, and the other end of the fifth capacitor is connected with the second capacitor C5_2 attached to the fifth filter unit and grounded; the sixth filtering unit 6 includes a sixth inductor H6, a sixth capacitor C6, a first capacitor C6_1 attached to the sixth filtering unit, and a second capacitor C6_2 attached to the sixth filtering unit, and the connection method is as follows: a sixth inductor H6 is connected with a sixth capacitor C6 in parallel, one end of the sixth capacitor is connected with a sixth filter unit auxiliary first capacitor C6_1 to be grounded, and the other end of the sixth capacitor is connected with a sixth filter unit auxiliary second capacitor C6_2 to be grounded; the seventh filtering unit 7 includes a seventh inductor H7, a seventh capacitor C7, a first capacitor C7_1 attached to the seventh filtering unit, and a second capacitor C7_2 attached to the seventh filtering unit, and the connection method is as follows: the seventh inductor H7 is connected with the seventh capacitor C7 in parallel, one end of the seventh capacitor is connected with the seventh filter unit auxiliary first capacitor C7_1 to be grounded, and the other end of the seventh capacitor is connected with the seventh filter unit auxiliary second capacitor C7_2 to be grounded; the eighth filtering unit 8 includes an eighth inductor H8, an eighth capacitor C8, an eighth filtering unit auxiliary first capacitor C8_1, and an eighth filtering unit auxiliary second capacitor C8_2, and the connection method is as follows: the eighth inductor H8 is connected with the eighth capacitor C8 in parallel, one end of the eighth capacitor is connected with the eighth filter unit auxiliary first capacitor C8_1 to be grounded, and the other end of the eighth capacitor is connected with the eighth filter unit auxiliary second capacitor C8_2 to be grounded; the ninth filtering unit 9 includes a ninth inductor H9, a ninth capacitor C9, a first capacitor C9_1 attached to the ninth filtering unit, and a second capacitor C9_2 attached to the ninth filtering unit, and the connection method is as follows: a ninth inductor H9 is connected with a ninth capacitor C9 in parallel, one end of the ninth capacitor is connected with a ninth filter unit auxiliary first capacitor C9_1 to be grounded, and the other end of the ninth capacitor is connected with a ninth filter unit auxiliary second capacitor C9_2 to be grounded;
the harmonic filters of the seven wave bands are connected to form the suppression of the harmonic filters of the seven wave bands, namely, the harmonic filter with the seven wave bands is formed, and the method specifically comprises the following steps: an input end RF _ IN of a harmonic filter with seven wave bands is respectively connected with a first relay K1, a second relay K2, a third relay K3, a fourth relay K4, a fifth relay K5, a sixth relay K6 and a seventh relay K7; the other end of the first relay K1 is connected to one end of a first filtering unit, and the other end of the first filtering unit is connected with a second relay K2; the other end of the second relay K2 is connected to one end of a second filtering unit, and the other end of the second filtering unit is connected with a third relay K3; the other end of the third relay K3 is connected to one end of a third filtering unit, and the other end of the third filtering unit is connected with a fourth relay K4; the other end of the fourth relay K4 is connected to one end of a fourth filtering unit, and the other end of the fourth filtering unit is connected with a fifth relay K5; the other end of the fifth relay K5 is connected to one end of a fifth filtering unit, and the other end of the fifth filtering unit is connected with a sixth relay K6; the other end of the sixth relay K6 is connected to one end of the sixth filtering unit, and the seventh relay K7 is arranged at the other end of the sixth filtering unit; the other end of the 7 th relay K7 is connected to one end of the seventh filtering unit, the other end of the seventh filtering unit is connected to one end of the eighth filtering unit, and the ninth filtering unit is connected to the outside behind the eighth filtering unit, namely the output end RF _ OUT of the harmonic filter.
BAND1 to BAND7 are 7 BAND divisions of a broadband power amplifier, respectively, from BAND1 to BAND7 in order from low frequency to high frequency.
The main idea of the invention is to apply the special property of a low-pass filter, multiplex the low-pass filter with high cut-off frequency in the low-pass filter with low cut-off frequency, gate through the switching of the states of 7 relays, and control the working states of BAND1 to BAND7 by K1 to K7 respectively.
When the electronic ballast works in the BAND7, the signal flow is switched into the input end of the seventh filtering unit 7 from the seventh relay K7 by switching the state of the seventh relay K7, and the compensation of a filtering capacitor is performed by switching the state of the relay, namely, a first switch of the seventh relay K7 is connected with the input end of a harmonic filter with seven wave BANDs, and a second switch of the seventh relay K7 is connected with a first compensation capacitor with the seventh wave BAND to the ground for capacitor compensation; the first switches of other relays are connected with the filter unit of the previous wave BAND, the second switches of the corresponding relays are connected with the second compensation capacitor of the current wave BAND, the filter unit of the current wave BAND is connected with the second compensation capacitor of the current wave BAND in parallel and used for capacitor compensation, and the harmonic filter is composed of a seventh relay K7 and seventh filter units 7 to ninth filter units 9, so that the harmonic filter of the BAND7 wave BAND is formed, the whole harmonic filter meets the requirements of insertion loss and harmonic suppression, and the requirement of system performance design is met. The signal flow is shown in figure 3.
When the filter works in the BAND6, the signal flow direction is switched into the input end of a sixth filtering unit 6 from a sixth relay K6 by switching the sixth relay K6, and capacitance compensation is carried out on a filtering circuit by switching the states of a seventh relay K7 to the sixth relay K6, namely a first switch of the sixth relay K6 is connected with the input end of a harmonic filter with seven wave BANDs, and a second switch of the sixth relay K6 is connected with a first compensation capacitor with the sixth wave BAND to the ground for capacitance compensation; the first switches of other relays are connected with the filter unit of the previous wave band, and the second switches of the corresponding relays are connected with the second compensation capacitor of the current wave band, so that the filter unit of the current wave band is connected with the second compensation capacitor of the current wave band in parallel for capacitance compensation; the harmonic filter is composed of a sixth relay K6 and sixth filtering units 6 to ninth filtering units 9, thus the harmonic filter of the BAND6 wave BAND is formed, namely the harmonic filter of the BAND7 is multiplexed into the harmonic filter of the BAND6 to work, and the signal flow is as shown in figure 4.
When the electric vehicle works in a BAND1 wave BAND, the first relay K1 is switched, a signal flow direction is accessed to the input end of the first filtering unit 1 from the first relay K1, the switching of other relays is used for capacitance compensation, namely, a first switch of the first relay K1 is connected with the input end of a harmonic filter with seven wave BANDs, and a second switch of the first relay K1 is connected with a first compensation capacitor of the first wave BAND to be grounded and used for capacitance compensation; the first switches of other relays are connected with the filter unit of the previous wave band, and the second switches of the corresponding relays are connected with the second compensation capacitor of the current wave band, so that the filter unit of the current wave band is connected with the second compensation capacitor of the current wave band in parallel for capacitance compensation; the harmonic filter is composed of the first filtering unit 1 to the ninth filtering unit 9, thus the harmonic filter of BAND1 wave BAND is formed, namely the harmonic filter of BAND2 is multiplexed into the harmonic filter of BAND1 to work, and the signal flow is as shown in figure 5.
By analogy, when the current working state is switched to the next working state, the current direction of the signal is controlled through the switching of the relay, and meanwhile, the compensation of the filter capacitor is carried out through the relay, so that the harmonic suppression requirements of different wave bands during working are met.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A miniaturized harmonic filter with reusable inductance is characterized by comprising a relay and a filtering unit;
the number of the relays is K, the number of the filtering units is M, and one relay is connected with the N filtering units to form a harmonic filter with one wave band;
the filtering unit comprises an inductor and a capacitor;
harmonic filters of K wave bands are connected to form wave band harmonic filter suppression of the broadband power amplifier;
the device also comprises a compensation capacitor, wherein each wave band of the compensation capacitor is provided with a capacitor; the compensation capacitor comprises a first compensation capacitor and a second compensation capacitor; the first compensation capacitor is grounded, and the second compensation capacitor is connected with the band filtering unit in parallel;
the relay is a double-pole single-throw relay, when the relay works in the wave band, one switch is connected with a filtering unit of the previous wave band, and the other switch is connected with a first compensation capacitor of the wave band; when the filter works in other wave bands, one switch is connected with the output ends of harmonic filters of K wave bands, the other switch is connected with a second compensation capacitor of the wave band, the wave bands of the harmonic filters of the wave bands sequentially range from low frequency to high frequency, the harmonic filters of the wave bands are connected in a cascade mode, and low-pass filters with high cut-off frequency are superposed and multiplexed in low-pass filters with low cut-off frequency.
2. The inductance-reusable miniaturized harmonic filter according to claim 1, wherein one of said filter units is formed by connecting an inductance and three capacitors, said capacitors comprising a main capacitor and two auxiliary capacitors.
3. The inductance-reusable miniaturized harmonic filter according to claim 2, wherein the inductance and the capacitance are connected, specifically: the inductor is connected with the main capacitor in parallel, the first end of the auxiliary first capacitor is connected with the first end of the main capacitor in series, and the second end of the auxiliary first capacitor is grounded; the first end of the auxiliary second capacitor is connected with the second end of the main capacitor in series, and the second end of the auxiliary second capacitor is grounded.
4. The inductance-reusable miniaturized harmonic filter according to claim 1, characterized in that the relay and the filter unit are connected in series; the method comprises the following specific steps:
one end of the relay of the current waveband is connected with the filtering unit of the current waveband, and the other end of the relay of the current waveband is connected with the filtering unit of the previous waveband; the other end of the filter unit of the wave band is connected with a relay of the next wave band.
5. The inductance-reusable miniaturized harmonic filter according to claim 1, characterized in that said M > K; the M is greater than N.
6. The inductance-reusable miniaturized harmonic filter according to claim 5, wherein the filter units, which are not connected to the relay, are connected in series to the harmonic filter of the last band.
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