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This paper proposed a novel varactor-tuned dual-band filter with constant absolute bandwidth. It is composed of a pair of half-wavelength open-ended resonators and a pair of quarter-wavelength short-ended resonators. The resonators utilized two different methods to control the electric and magnetic coupling so as to achieve constant absolute bandwidth. A dual-band tunable filter is designed, and the...
This paper presented a deformed microstrip combline UHF (Ultra High Frequency) bandpass filter structure with continuous tunability for both center frequency and bandwidth. By using bandwidth control subnetwork, couplings between resonators can be controlled, so as to achieve the tunability of the bandwidth. The electrical length of the deformed filter resonator approximately equals to eg/8, it not...
In this paper, an 8th-order cavity filter with two symmetrical transmission zeros in stopband is designedwith the method of generalized Chebyshev synthesis so as to satisfy the IMT-Advanced system demands. To shorten the development cycle of the filter from two or three days to several hours, a co-simulation with Ansoft HFSS and Designer is presented. The effectiveness of the co-simulation method...
This paper proposes a dual-band power amplifier employing composite right/left-handed transmission line. The two operating frequencies of the power amplifier are achieved by the nonlinear phase slope and other characteristics of CRLH-TL, which can make an arbitrary selection. The operating frequencies are chosen 950 MHz and 1900 MHz in this paper. Through the ADS optimum design, the maximum PAE of...
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