A Duplex Filter Switch Based on Coupling Control
A coupling control and duplexing technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problems of high cost, heavy weight, large volume, etc., and achieve low loss, good suppression effect, and good duplexer performance. Effect
Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
The cavity duplexer with the best performance has the characteristics of low insertion loss and high isolation, but the cost is too expensive, and it is large in size and heavy in weight, which limits the application of the cavity duplexer in some scenarios
Devices with microstrip structure have the advantages of low cost, light weight, and small size; many scholars also use it to realize duplexers or duplex switch circuits; for example, some scholars use the technical realization of step impedance resonators and public resonators In addition, some scholars have designed a duplex switch circuit based on parallel coupling filters, but it can only have one output at a certain time, and cannot be used as a duplexer. , working in two working frequency bands at the same time
At present, it is rarely proposed that there are duplex filter switches that can be switched to one of the working frequency bands or work in two working frequency bands at the same time or several states that both working frequency bands do not work.
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[0036] Such as figure 1 As shown, a duplex filter switch based on coupling control includes an upper microstrip structure, an intermediate dielectric substrate and a bottom metal floor.
[0037] The upper microstrip structure includes a first feeder 1, a second feeder 6, a third feeder 7, a first resonator 2, a second resonator 3, a third resonator 4, a fourth resonator 5, a The first and second capacitors 12, 13, the first switch circuit 10 and the second switch circuit 11, the first, second and third feed lines are respectively connected to the first port P1, the second port P2 and the third port P3 , one end of the second feeder 6 is connected to the first switch circuit 10, the other end is grounded through the first capacitor 12, one end of the third feeder is connected to the second switch circuit 11, and the other end is grounded through the second capacitor 13;
[0038] In the entire upper microstrip structure, the first feeder is located in the middle, the left side ...
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The invention discloses a duplex filter switch based on coupling control, which includes an upper microstrip structure, an intermediate dielectric substrate and a bottom metal floor, and the upper microstrip structure is provided with a first feeder, a second feeder, and a third feeder , the first resonator, the second resonator, the third resonator, the fourth resonator, the first switch circuit and the second switch circuit, three feed lines and four resonators constitute a filter network working at two different frequencies , the duplex filter switch proposed by the present invention can be applied to two working frequency bands with very close frequencies, and has creativity and practicability.
Description
technical field [0001] The invention relates to a duplex filter switch, in particular to a duplex filter switch based on coupling control. Background technique [0002] In a multi-frequency wireless transceiver system, duplexers and duplex switches are important components. If a duplexer integrates the performance of a radio frequency switch and a band-pass filter to obtain a duplex filter switch; it can be used to realize that the multi-frequency multi-mode wireless modules in the radio frequency front-end circuits of multiple transceivers share a pair of antennas, thereby Greatly reduces the volume of the system. [0003] The duplex filter switch is required to have a small insertion loss, thereby improving the signal-to-noise ratio received by the antenna; at the same time, it must have high isolation to prevent the signal from the transmitting end from being coupled to the receiving end and burning out the receiver. In recent years, scholars at home and abroad have car...
Claims
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IPC IPC(8): H01P1/203H01P1/10
CPCH01P1/10H01P1/203H01P1/20381
Inventor 章秀银李慧阳詹万里徐金旭
Owner SOUTH CHINA UNIV OF TECH