N. Mohottige

Ultra Compact Inline

This letter presents an ultra compact extracted pole E-plane filter. The proposed structure can achieve up to 65% size reduction in comparison with a standard extracted pole filter designed at 9.5 GHz centre frequency with a 3% fractional bandwidth. The filter has been fabricated and tested using E-plane waveguide technology. Measurements on a fabricated filter confirm the accuracy of the design method.

{\rm E}

This paper presents an ultra compact waveguide bandpass filter that exhibits a pseudo-elliptic response. The transmission zero created in the upper stopband to form a rapid roll off is produced through a bypass coupling with higher order modes. A 3rd order filter is designed at the centre frequency of 9.4 GHz with a 5.3% fractional bandwidth. The proposed structures size is 38% smaller than one of a 3rd order E-plane extracted pole filter with comparable response. Additionally, this configuration allows larger span of different bandwidths. The filter has been fabricated and tested using E-plane waveguide technology, which has benefits of being inexpensive and having mass producible capabilities. Measurements of such a fabricated filter validate the simulated results.

-Plane Waveguide Extracted Pole Bandpass Filters

This paper presents electromagnetic simulations of dielectric-filled rectangular waveguide bandpass filter structures with microstrip to waveguide transitions as well as a diplexer based on such filters for modern wireless systems. The two bandpass filters have been designed and simulated at centre frequencies of 11.85 and 14.25 GHz, respectively. A significant size reduction is achieved through dielectric filling.

Ultra compact pseudo-elliptic inline waveguide bandpass filters using bypass coupling

The rapid expansion of modern wireless communication systems demand microwave filters with improved characteristics. Over the past few decades all-metal inserts placed in the E-plane of a rectangular waveguide have been a sustainable solution for robust, low-cost, mass producible, low loss and high power filters at microwave and millimeter-wave frequencies. However, despite their favorable performances, the attenuation in the second stopband may often be too low and too narrow for diplexer and multiplexer applications.

Compact dielectric-filled waveguide filters and diplexers

This paper presents electromagnetic simulation of dielectric-filled rectangular waveguide antenna filter arrays. Arrays of microstrip rectangular patch antennas are endwall coupled with waveguide feeds that incorporate E-planes filters via slots in the ground plane. Signals can easily be distributed to/from these waveguides using microstrip technology, allowing antenna pattern synthesis and implementation of phased arrays. The key goals are compactness and good radiation characteristics. The antenna filter arrays are designed and simulated at the centre frequency of 11.85 GHz.

Electromagnetic modelling of ridged waveguide resonator loaded bandpass filters

This paper presents electromagnetic simulation of a dielectric-filled rectangular waveguide antenna filter structure. A microstrip rectangular patch antenna represents the radiating element of this structure and it is endwall coupled with a waveguide that incorporates E-plane filter via a slot in the ground plane. Microstrip antenna, dielectric filling of the waveguide and direct connection between the antenna and the filter ensure compactness as the primal goal. The example antenna filter is designed and simulated at the centre frequency of 11.85 GHz.

Electromagnetic modelling of dielectric-filled waveguide antenna filter arrays

This paper presents electromagnetic simulation of a varactor-tuned E-plane waveguide band-pass filter. Silicon varactor diodes which can operate through X band are placed between gaps in the centre fins of an E-plane extracted pole section to provide tuneability for the filter structures. The simulation of the filter was carried out by CST Microwave Studio with the diodes being modelled by its Spice model in CST Design Studio. Tuning range of 280 MHz is achieved.

Electromagnetic modelling of dielectric-filled waveguide antenna filters

This paper presents electromagnetic simulation of a dielectric-filled rectangular waveguide bandpass filter structure for modern wireless system applications. Two bandpass filters have been designed and simulated at centre frequencies of 11.85 and 14.25 GHz, respectively. A significant size reduction is achieved.