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In this work, a direct synthesis approach based on the power wave renormalization theory is proposed for designing a filter that matches to complex frequency variant loads at both ports. It is shown that a network consisting of an ideal filter cascaded with two pieces of transmission line of optimal lengths at each port can match to the complex loads over a certain frequency band with a best effort...
This paper presents a lowpass decoupling network (LDN) for a pair of strongly-coupled antennas working at the same frequency. Compared with the state-of-art decoupling techniques, the LDN has a simple circuit configuration. Moreover, it has less impact on the matching bandwidth. To demonstrate the concept, a fifth order LDN is designed and fabricated using LTCC technology to decouple a symmetric PIFA...
Microwave-induced thermoacoustic imaging (TAI) has been actively researched in the past decade and shown to be a promising non-ionizing technology for breast cancer detection [1, 2]. TAI develops an image indicative of the internal structures of a biological sample by exploiting emanated acoustic waves from absorbed microwave energy in the sample due to the thermoacoustic effect [3]. As a hybrid modality,...
Taking advantages of the high contrast of microwave imaging and high spatial resolution of ultrasound imaging, microwave-induced thermoacoustic imaging (TAI), a non-ionizing modality, has been studied for biomedical applications, such as breast cancer detection. Nowadays, although progress has been made, improvised explosive devices (IEDs) are still a major threat to public safety. In this simulation...
Electromagnetic properties of hydroxylapatite and oxalate powders are characterized over 1.7–2.6 GHz using a WR-430 rectangular waveguide. The effective dielectric constant and loss tangent of both compounds are derived from the measured S parameters. Effective medium theory is then applied to extract the intrinsic property of each compound. The extracted intrinsic dielectric constants are 3.37 and...
Thermoacoustic imaging (TAI) is an emerging promising hybrid modality for biomedical imaging. High spatial resolution of TAI is conventionally accomplished by utilizing a short exciting microwave pulse, but squeezing the microwave pulse simultaneously degrades the signal-to-noise ratio (SNR) of the thermoacoustic image. There is usually a tradeoff between resolution and SNR. Compressive sensing (CS),...
Microwave-induced thermoacoustic imaging (TAI), inheriting fine resolution from ultrasound imaging with relatively low scattering and high dielectric contrast from microwave imaging, is considered a promising non-ionized hybrid approach for biomedical applications including breast cancer detection, foreign body detection, detection of renal calculi, etc. In TAI, ultrasound signals are generated from...
In this paper, waveguide dual-mode bandpass filter in extended box coupling topology is for the first time designed and presented. By configuring in this topology, the dualmode filter can realize independently-controllable transmission zeroes which may be difficult for a filter in conventional cascade-quartet (CQ) topology to realize. An asymmetric 6-pole circular waveguide dual-mode bandpass filter...
This paper presents a direct synthesis method for a general Chebyshev band pass filter that is matched to a general frequency dependent complex load. The method is based on the power wave renormalization theory and the characteristic polynomial representation of a filter network. By renormalizing the termination load impedance, three necessary conditions that stipulate the polynomials associated to...
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