Abstract
To satisfy the requirements of the emerging wireless communication system, the simultaneous implementation of large frequency ratio and tight coupling is demanded for a dual-band coupler. But most of the existing dual-band coupler structures can only achieve one of them. In this paper, a new coupled line based dual-band coupler structure is proposed. The detailed theoretical analysis is conducted for different ranges of frequency ratio. It was shown that a wide frequency ratio from 1.4 to 11.7 can be achieved even for the designs which require a tight coupling of 3 dB. For higher flexibility, the same circuit topology is further investigated to implement the arbitrary power division ratios over the two bands. More importantly, the design parameters for the large frequency ratio and arbitrary power division ratio are found to be almost independent resulting in a simple design procedure. For demonstration purposes, a dual-band 3 dB coupler with a large frequency ratio of 6 is designed, fabricated and measured. Furthermore, another dual-band coupler with coupling coefficients of 3 dB and 6 dB at 2 GHz and 4 GHz is designed, fabricated and measured. Good agreement between simulation and measurement can be observed for both prototypes.
Highlights
With rapid development of wireless communications, different standards have emerged for various applications
A lot of efforts have been made by the researchers to implement different types of dual-band couplers
Respectively whilst maintaining quadrature phase characteristics. This verifies the flexibility of the proposed structure in implementing arbitrary power division ratios over two bands
Summary
With rapid development of wireless communications, different standards have emerged for various applications. Arbitrary power division ratios over two bands is important for a coupler with a large frequency ratio, which has not previously been realized To solve this problem, the aperture coupling mechanism was proposed to feed two elements simultaneously to implement a dual-band coupler which can achieve a large frequency ratio up to 33.3 [18]. The aperture coupling mechanism was proposed to feed two elements simultaneously to implement a dual-band coupler which can achieve a large frequency ratio up to 33.3 [18] This structure is more suitable for the applications in which the higher frequency is within the millimeter wave frequency band, as the SIW element becomes bulky when the operating frequency is within the microwave frequency band. A new structure that can achieve a large frequency ratio, tight coupling, and arbitrary power division ratios over the two bands is required
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