Integrated front end antenna
First Claim
Patent Images
1. An apparatus for receiving radio frequency signals, comprising:
- an antenna for operating within a frequency band having an antenna reactance at antenna terminals;
a filter having a filter reactance at filter input terminals, the filter for producing a filtering effect on certain radio frequency signals; and
wherein the antenna reactance and the filter reactance are opposite in sign and substantially equal in magnitude at frequencies within the frequency band, and wherein the antenna terminals are differentially connected to the filter input terminals to substantially cancel the effects of the antenna reactance and the filter reactance.
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Abstract
A radio frequency transmitting and receiving apparatus comprising a filter and an antenna, wherein the input reactance of the antenna is substantially equal in magnitude and opposite in sign to the output reactance of the filter. This reactance relationship permits the antenna and filter to be collocated and avoids transformation of the input and output impedances to the conventional 50 ohms such that the filter and antenna can be connected with a conventional 50 ohm transmission line.
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Citations
19 Claims
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1. An apparatus for receiving radio frequency signals, comprising:
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an antenna for operating within a frequency band having an antenna reactance at antenna terminals; a filter having a filter reactance at filter input terminals, the filter for producing a filtering effect on certain radio frequency signals; and wherein the antenna reactance and the filter reactance are opposite in sign and substantially equal in magnitude at frequencies within the frequency band, and wherein the antenna terminals are differentially connected to the filter input terminals to substantially cancel the effects of the antenna reactance and the filter reactance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for receiving radio frequency signals:
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an antenna for operating within a frequency band having an antenna reactance and comprising first and second spaced apart elements, wherein the first element is connected to an antenna feed terminal and the second element is connected to ground; an electronics module disposed between the first and the second elements, wherein the electronics module comprises a filter having a filter reactance between first and second filter terminals and further comprising the first terminal and the second terminal differentially connected respectively to the first element and to the second element; and wherein the antenna reactance and the filter reactance are opposite in sign and substantially equal in magnitude at frequencies within the frequency band, and wherein the differential connection causes the antenna reactance to substantially cancel the filter reactance. - View Dependent Claims (10, 11)
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12. An apparatus for receiving radio frequency signals, comprising:
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a substrate; antenna elements supported by the substrate, wherein each antenna element has an element reactance at element terminals; and a filter associated with each antenna element, each filter having input terminals, wherein a filter reactance of the filter is opposite in sign and substantially equal in magnitude to the element reactance of the associated antenna element, wherein the antenna element terminals are differentially connected to the filter input terminals causing the filter reactance to substantially cancel the element reactance. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification