Commonly coupled high frequency transmitting/receiving switching module
First Claim
Patent Images
1. A high frequency transmitting/receiving switching module, comprising:
- a transmitting circuit having an output;
a receiving circuit having an output;
an antenna circuit having an output;
an external circuit having an output;
the outputs of the transmitting and receiving circuits being connected defining a first junction and including a first control circuit, the outputs of the external and antenna circuits being connected defining a second junction and including a second control circuit; and
the first junction being coupled to the second junction via a common coupling circuit, whereby a control signal selectively applied to at least one of the first and the second control circuits selectively couples the transmitting or receiving circuit to the antenna or external circuit via the common coupling circuit, the common coupling circuit substantially isolating switched circuits from unswitched circuits.
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Abstract
What is described is a commonly coupled high frequency transmitting/receiving switching module (100). The switching module (100), has a transmitting circuit (102), a receiving circuit (104), an antenna circuit (106), an external circuit (108), a coupling circuit (110) and control circuits (124, 126). The switching module may be switched between one of four circuit paths (202, 204, 206, 208) each path incorporating an integral harmonic filter (210, 212). This structure is adapted for use in a multi-layer ceramic integrated circuit, and provides the advantage of minimizing current consumption with a minimal number of components.
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Citations
21 Claims
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1. A high frequency transmitting/receiving switching module, comprising:
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a transmitting circuit having an output; a receiving circuit having an output; an antenna circuit having an output; an external circuit having an output; the outputs of the transmitting and receiving circuits being connected defining a first junction and including a first control circuit, the outputs of the external and antenna circuits being connected defining a second junction and including a second control circuit; and the first junction being coupled to the second junction via a common coupling circuit, whereby a control signal selectively applied to at least one of the first and the second control circuits selectively couples the transmitting or receiving circuit to the antenna or external circuit via the common coupling circuit, the common coupling circuit substantially isolating switched circuits from unswitched circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A high frequency transmitting/receiving switching module including transmitting, receiving, common coupling, antenna, external, first and second control circuits, and at least one control signal, the control circuits selectively permitting interconnection of the transmitting or receiving circuit to the antenna or external circuit via the common coupling circuit, the switching module comprising:
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a first circuit path interconnecting the transmitting circuit and the antenna circuit via the common coupling circuit when no control signals are present, the receiving and external circuits being substantially electrically isolated from the transmitting and antenna circuits; a second circuit path interconnecting the receiving circuit and the antenna circuit via the common coupling circuit when a control signal is present on the first control circuit, the transmitting and external circuits being substantially electrically isolated from the receiving and antenna circuits; a third circuit path interconnecting the transmitting circuit and the external circuit via the common coupling circuit when a control signal is present on the second control circuit, the receiving and antenna circuits being substantially electrically isolated from the transmitting and external circuits; and a fourth circuit path interconnecting the receiving circuit and the external circuit via the common coupling circuit when a control signal is present on the first and second control circuits, the transmitting and antenna circuits being substantially electrically isolated from the receiving and external circuits. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A high frequency transmitting/receiving switching module including a transmitting, receiving, antenna, external and common coupling circuit including at least one integral harmonic filter, the transmitting and receiving circuits including a first control circuit, the antenna and external circuits including a second control circuit, the control circuits selectively permitting independent interconnection of the transmitting or receiving circuit to the antenna or external circuit via the common coupling circuit, the switching module comprising:
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the transmitting circuit having an output and including a DC blocking capacitor being connected to a transmission line and a first leg of the first control circuit, the first leg including a biasing diode having a cathode and an anode, the anode being connected to a nulling capacitor, the nulling capacitor nulling the inductance of the biasing diode; the receiving circuit having an output and including a DC blocking capacitor, a transmission line and a diode having an anode and a cathode, the DC blocking capacitor being connected to a second leg of the first control circuit and the transmission line, the transmission line being connected to the cathode of the diode, the second leg including a transmission line choke being connected to a shunt capacitor, whereby the second leg presents a substantially electrically open circuit to the receiving circuit; the antenna circuit having an output and including a DC blocking capacitor being connected to a transmission line and a first leg of the second control circuit, the first leg including a biasing diode having a cathode and an anode, the anode being connected to a nulling capacitor, the nulling capacitor nulling the inductance of the biasing diode; the external circuit having an output and including a DC blocking capacitor and a diode having an anode and a cathode, the DC blocking capacitor being connected to a second leg of the second control circuit and the transmission line, the transmission line being connected to the cathode of the diode capacitor, the second leg including a transmission line choke being connected to a shunt capacitor, whereby the second leg presents a substantially electrically open circuit to the external circuit; the common coupling circuit having a first and a second junction and including a transmission line being connected to a DC blocking capacitor, the first junction connecting to the outputs of the transmitter and receiver circuits, the second junction connecting to the outputs of the antenna and external circuits; the transmission lines of the transmitting, receiving, antenna, and common coupling circuits each having a stray capacitance and a predetermined length being selected to compensate and incorporate each associated stray capacitance to provide a substantially equivalent one-quarter wavelength transmission line; a first circuit path interconnecting the transmitting circuit and the antenna circuit via the common coupling circuit when no control signals are present, all diodes being unbiased, the receiving, external and first leg circuit diodes presenting a high impedance to substantially electrically isolate the receiving, external and control circuits, the transmitting, coupling and antenna circuits having a low impedance and integrally providing a seven-element harmonic filter; a second circuit path interconnecting the receiving circuit and the antenna circuit via the common coupling circuit when a control signal is present on the first control circuit, the diode of the external circuit and first leg of the second control circuit being unbiased to present a high impedance to substantially electrically isolate the external and second control circuits, the transmission line of the transmitting circuit being substantially electrically shorted at the first leg biasing diode of the first control circuit thereby presenting a substantially electrically open circuit to the receiving circuit, the receiving, coupling and antenna circuits having a low impedance and integrally providing a seven-element harmonic filter; a third circuit path interconnecting the transmitting circuit and the external circuit via the common coupling circuit when a control signal is present on the second control circuit, the diode of the receiving circuit being unbiased to present a high impedance to substantially electrically isolated the receiving circuit, the transmission line of the antenna circuit being substantially electrically shorted at the first leg biasing diode of the second control circuit thereby presenting a substantially electrically open circuit to the external circuit, the transmitting, coupling and external circuits having a low impedance and integrally providing a five-element harmonic filter; and a fourth circuit path interconnecting the receiving circuit and the external circuit via the common coupling circuit when a control signal is present on the first and second control circuits, the transmission lines of the transmitting and antenna circuits being substantially electrically shorted at the first leg biasing diodes of the first and second control circuits thereby presenting substantially electrically open circuits to the receiving and external circuits, the receiving, coupling and external circuits having a low impedance and integrally providing a five-element harmonic filter.
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Specification