This paper will describe the design and testing of solid-state subharmonically-pumped mixers from 380 GHz to 640 GHz. The main goal has been to develop robust, compact, solid-state room-temperature receivers with state-of-the-art sensitivity and broad IF bandwidths for applications such as airborne and space-based microwave sounding. Testing of a 380 GHz integrated mixer has yielded state-of-th...

A simple and analytical design methodology for a novel planar four-port structure to implement power divider (PD) or balun with variable power division is proposed in this paper. It consists of two different 3 dB branch-line couplers and one coupled-line phase shifter whose length can be changed to implement variable power division. Different from the previous designs, the power divider and bal...

The characteristics of the quasi-static TEM mode of a cylindrical microstrip transmission line are investigated using the finite difference technique. The transmission line consists of two perfectly conducting strips located between two different layers of dielectric materials, and a dielectric notch embedded in the substrate between two strips. The dielectric overlay and substrate are truncate...

A new Sierpienski & Crown Square Fractal Shapes Slotted Microstrip Patch Antenna is proposed. A patch antenna is a narrowband, wide-beam antenna. These antennas are low profile, conformal to planar and non-planar surface, simple and inexpensive to manufacture using modern printed circuit technology, mechanically robust when mounted on rigid surface, compatible with MMIC designs and when the par...

In this paper, the design of a waveguide fixtuned 220GHz subharmonically pumped mixer using Schottky planar diodes is demonstrated. It is supposed to be applied in an experimental short-range and high-speed communication system. The anti-parallel pair of planar Schottky diodes from the Rutherford Appleton Laboratory (RAL) was flip-chip mounted and soldered onto a suspended 75μm-thick quartz mic...

This Paper is an attempt to give an overview of Microstrip Spurline Band Stop Filter. The basic concepts and filtering characteristics of Microstrip Spurline Band Stop Filter are introduced and the equivalent circuit models with filter response are also presented. Also, the main applications of Microstrip Spurline Band Stop Filter in microwave technology field are summarized and the evolution t...

In this paper we show the triangular geometry of the microstrip patch is one of the mostcommon shapes having a wide range application ranging from circuit elements to modernwireless antenna. In this paper we compare Cslot microstrip antenna an slotted equilateraltriangular microstrip antenna. Recent survey of open literature shows interesting developmentof this patch as novel ci...

A planar millimeter-wave third-harmonic mixer with low conversion loss is proposed. The mixing circuit consists of a substrate-integrated waveguide (SIW) balun, a pair of diodes, a diplexer and microstrip matching circuit. The mixer is ideal for use as down-converter and up-converter. For a fixed intermediate frequency (IF) of 2 GHz, the mixer has an up-conversion loss of 14.5-15.6 dB and a dow...

A planar magnetoinductive (MI) waveguide loaded rectangular microstrip patch antenna is presented and discussed. The MI waveguide consists of two planar metamaterial split squared ring resonators (SSRRs) placed in between two microstrip lines. The backward wave propagation takes place through this structure. The rectangular microstrip patch antenna is magnetically coupled to the MI waveguide. T...

In order to realize a planar quadruplexer, we analyzed dual-mode resonator based on hairpin resonator, focusing the resonant frequency and transmission zero. Using four types of bandpass filters (BPFs) with different center frequencies were designed for use in quadruplexer applying microstrip line structure. The target passbands each BPF are approximately 1.9 2.2 GHz, 2.3 2.6 2.7 3.0 3.1 3.5 wh...