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This paper presents a linear high efficiency three-level polar DSM based transmitter that is adequate for wireless RF applications. The polar DSM runs at low sampling frequency that is related to the used oversampling ratio and the bandwidth of the signal standard. Through simulation, a high coding efficiency and high linearity can be achieved concurrently by adjusting the power level of the input...
For microstrip patch phased arrays, larger fractional bandwidth (FBW) and wider scan angle are challenging to achieve at the same time. Phased arrays on thin substrates typically can scan to large angles due to the reduction of mutual coupling caused by surface waves. However, thin substrates limit the achievable FBW of the phased array antenna. In this paper, an integrated filter/patch technology...
In this letter, a quad-mode single band bandpass filter and a dual-mode dualband bandpass filter are designed and fabricated by the same structure (two coupled dual-mode loop resonators), which consist of an outer loop resonator with square-patch perturbation at the corner and a inner loop resonator with corner-cut perturbation at the corner. Four transmission zeros are realized in the stopbands to...
In this paper, a multi-band bandpass filter (BPF) based on a novel architecture and design method is presented. Very uniquely, its multi-band frequency response is synthesized by giving the transmission- and reflection-zero frequencies. To verify the proposed method, a miniaturized dual-band BPF is implemented using low-temperature co-fired ceramic (LTCC) technology. The size of filter is 2.0 mm ×...
This paper presents a new application of absorptive bandstop filter for absorbing the LO-to-RF leakage of mixer in a Q-band heterodyne receiver. The proposed absorptive bandstop filter (ABSF) is achieved by introducing lossy quarter-wavelength resonator to a conventional narrowband bandstop filter. In order to facilitate the receiver system integration, the proposed ABSF is implemented in commercial...
A W-band divide-by-1.5 injection-locked frequency divider (ILFD) using 90 nm CMOS process is presented in this paper. Due to the fractional frequency division, the proposed divide-by-1.5 ILFD can be employed in a millimeter-wave local oscillation chain to avoid the injection pulling caused by the power amplifier. The measured input locking range is from 91 to 93.7 GHz, and the free-running oscillation...
This paper introduces a new physical interpretation of a frequency-dependent source/load (S/L) coupling to multi-mode filter designs, thereby successfully generating (N + 1) transmission zeros (TZs) greater than the number of resonant modes N. It is made clear by a transmission-line based analysis with the help of a parameter-extraction technique that the frequency-dependent S/L coupling essentially...
A novel multi-harmonic absorption filter that uses quasi-multilayered striplines is presented. The filter circuit consists of a multi-harmonic reflection filter, a broadband band-pass filter, and a terminator. The quasi-multilayered striplines, which consist of alumina substrates stacked using solder balls, improve the flexibility of layout for the resonator and offer low insertion loss at the basic...
A compact bandpass filter with a wide stopband has been proposed. This filter consists of two two-path coupled lines and a bandpass filter. Moreover, the two-path coupled lines employed for a wide stopband are connected at input/output ports separately. Therefore, the harmonics passed by the bandpass filter can be suppressed. A design example with 1 GHz for the central frequency is provided. In addition,...
This study presents novel switchable frequency selective surface (FSS) structures using encapsulated gas plasma elements. Simulations of geometric parameter sweeps show passband performance effects, and second-order model performance is compared with measured results. Average switchable attenuation can be increased from 24 dB for a second-order structure to 44 dB by adding another FSS and plasma element...
This paper presents an analytical approach to synthesis of a diplexer with a lumped-element junction model. The approach is based on the synthesis theory for a bandpass filter with a general complex load. Both non-resonant node type and the resonator type of junctions are considered in a uniform way. Different from existing diplexer synthesis methods, the junction model is synthesized rather than...
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