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A compact co-planar waveguide (CPW)-fed planar monopole antenna using the Cantor and Koch is presented. The design achieves a good input impedance match throughout 2–18 GHz. The using of Conter with Knoch structure is shown to extend the antenna's impedance bandwidth for ultra wideband (UWB) performance. Simulation results demonstrate that the antenna exhibits the desired VSWR level and radiation...
In this paper, a hybrid integrated detector system is presented. The system of the detector includes waveguide to microstrip transition, watching network, diode and low pass filter (LPF). The waveguide to microstrip transition is implemented by probe transition. The beam lead detector diode HSCH-9161 is adopted to build a zero-bias direct detector. An accurate physical model of diodes is established,...
This paper presents the design of A S-band low noise amplifier (LNA), which is made up of two stages with Agilent's ATF-54143. The biasing circuit, input stage, middle stage and output stage matching circuits of the LNA are designed and simulated by the software Agilent ADS. At last, the designed circuit is fabricated and measured. It is showed that, from 2.15GHz to 2.65GHz, the gain is between 27...
low noise amplifiers are the key components of the receiver front end, it has been widely used in microwave communication, radar, electronic warfare, and a variety of high-precision microwave measurement system and its performance directly affects the performance of entire receiving system, so it is essential to develop excellent low noise amplifier. In this paper, it has designed a LNA which has...
A miniature dual-mode microstrip bandpass filter at the central frequency of 15.5GHz is proposed using a half-wavelength (λ/2) stepped-impedance resonator (SIR) with a pair of symmetrical T-type tap-connected open-ended stubs. Such paired stubs with total length of about λ/2 constructs an equivalent line resonator. Distinct characteristics of this new type of dual-mode filter are investigated using...
On the basis of coupledline sections and impedance steps as inverter circuits, novel wideband and compact filters are presents. The compact broadband microstrip filter using a folded multiple-mode resonator contains only one resonator, which operates as not only a resonant element, but also an open stub. In addition, the filter owns a compact size, a broad passband, sharp skirts and two transmission...
A systematic procedure for designing harmonic-suppressed wideband microstrip bandstop filter (BSF) based on the frequency-selecting coupling structure (FSCS) is presented. This filter is added with shunt open stubs to introduce several attenuation poles to achieve a deeper rejection in the first and second stopband. The simulation result shows that the BSF has a wide 3 dB fractional bandwidth which...
A kind of novel compact wideband bandpass filter (BPF) is investigated in this paper. It is composed of four open-circuited stubs, in which two of them are folded to minimize the whole size of the filter. The new filter has been simulated and the characteristics are analyzed. The calculated results show that the BPF has a wide 3 dB fractional bandwidth which is more than 60% at the center frequency...
A dual polarized waveguide slotted array antenna is presented. A 45deg slant left polarization slot array is interlaced with a 45deg slant right polarization slot array within a common antenna structure to provide the capability of transmitting and receiving simultaneous dual orthogonal linear polarization states. The signals exhibiting dual orthogonal polarization states can have the same frequency...
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