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This paper designs a 3dB branch line coupler which is applied to the balanced power amplifier. By the traditional meandering method, the microstrips of the branch line coupler are bended to inside, thereby the size of the structure is reduced. The size of optimized branch line coupler is 0.18λ×0.13λ. Test results show that, in the 2.4∼2.485 GHz band, the magnitude of the straight port is consistent...
In this paper, a novel band-pass miniaturized FSS is proposed, in which a unit cell consists of four spiral etched slot lines arranged central-symmetrically on a dielectric substrate, and the spiral elements are placed interlaced so that each element is connected to an adjacent one in another unit cell. Simulation results show the FSS has the dimension of a unit cell only 0.060λ×0.060λ, where λ represents...
In this letter, a novel miniaturized periodic element for constructing a bandpass frequency selective surface (FSS) is proposed. Compared to previous miniaturized structures, the FSS proposed has better miniaturization performance with the dimension of a unit cell only 0.061 λ × 0.061 λ , where λ represents the wavelength of the resonant frequency. Moreover, the miniaturization characteristic is stable...
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